Manual Softstarter 3rw44 en-US
Manual Softstarter 3rw44 en-US
Manual Softstarter 3rw44 en-US
Important notes
Introduction 2
Configuration instructions 3
Industrial Controls
Installation, connection and
feeder configuration 4
Soft starters and solid-state
switching devices Display, controls and device
5
interfaces
3RW44 soft starters
Commissioning 6
Equipment Manual
Device functions 7
Appendix A
02/2020
NEB535219502000/RS-AC/009
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
A Appendix .............................................................................................................................................305
Index ...................................................................................................................................................307
Target group
This manual is intended for any user involved in
● Commissioning
● Servicing and maintenance
● Planning and configuring systems
Validity
This manual is valid for SIRIUS 3RW44 soft starters. It contains a description of the
components that are valid at the time of publication of this manual. SIEMENS reserves the
right to include updated information about new components or new versions of components
in a Product Information.
Definitions
Where the short form 3RW44 is used in the text, it refers to the SIRIUS 3RW44 soft starter.
Disclaimer of liability
The manufacturer of the system or machine is responsible for ensuring the correct overall
functioning. SIEMENS AG, its regional offices, and associated companies (hereinafter
referred to as "SIEMENS") cannot guarantee all the properties of a system or machine not
designed by SIEMENS.
Nor can Siemens assume liability for recommendations given or implied by the following
description. No new guarantee, warranty, or liability claims beyond the scope of the
SIEMENS general terms and conditions of supply are to be derived or inferred from the
following description.
Access aids
To facilitate and speed up access to special information, the manual contains the following
aids:
● At the beginning of the manual you will find a table of contents.
● The individual chapters contain subheadings that provide an overview of the contents of
the section.
● At the end of the manual, there is an extensive index to enable you to quickly access the
required information.
Problem
If a three-phase asynchronous motor is started directly, its typical current and torque
characteristics can cause disturbances in the supply system and the load machine.
Starting current
Three-phase asynchronous motors have a high direct starting current I (startup). Depending on
the motor version it can amount to between three times and fifteen times the rated
operational current. Seven to eight times the rated motor current can be taken as a typical
value.
Disadvantage
This results in the following disadvantage:
● Higher load on the electrical supply system. This means that the supply system must be
dimensioned for this higher output during the motor startup.
Locked-rotor torque
The starting torque and the breakdown torque can usually be assumed to be between two
and four times the rated torque. For the load machine this means that the starting and
acceleration forces in relation to rated operation give rise to a higher mechanical load on the
machine and the conveyed material.
Disadvantages
This results in the following disadvantages
● A higher load is placed on the machine's mechanical components
● Higher costs for replacing worn parts and maintaining the application
Solution
The SIRIUS 3RW44 electronic soft starter allows the current and torque characteristics
during startup to be optimally adapted to the requirements of each application.
Example
The diagrams below show the starting current and torque characteristics for a three-phase
asynchronous motor in combination with a soft starter:
Figure 2-3 Reduced current characteristic of a three-phase asynchronous motor during startup with
a SIRIUS 3RW44 soft starter
Figure 2-4 Reduced torque characteristic of a three-phase asynchronous motor during startup with
a SIRIUS 3RW44 soft starter
Startup
This means that, since the motor voltage is controlled by the electronic soft starter during the
startup process, the consumed starting current and the starting torque generated in the
motor are also controlled.
The same principle is applied during the stopping process. This way the torque generated in
the motor is slowly reduced, thus enabling a smooth ramp-down of the application.
The frequency remains constant during this process and corresponds to the line frequency,
in contrast to frequency-controlled startup and stopping of a frequency converter.
Once the motor has started up correctly, the thyristors are fully utilized, meaning that the
complete line voltage is applied to the motor terminals. As the motor voltage does not have
to be controlled during operation, the thyristors are bridged by integrated bypass contacts.
This minimizes the waste heat generated during continuous operation (which is caused by
the thyristor's power loss). Therefore the area around the switching devices heats up less.
The diagram below shows the method of operation of the 3RW44 soft starter:
Figure 2-5 Phase angle control and schematic diagram of a soft starter with internal bypass contacts
Applications
Typical applications include:
● Conveyor belts
● Roller conveyors
● Compressor
● Ventilators, fans
● Pump
● Hydraulic pumps
● Stirrers
● Centrifuges
● Milling machines
● Mills
● Crushers
● Circular saws/bandsaws
● ...
Advantages
Conveyor belts, conveyor systems:
● Smooth starting
● Smooth braking
Rotary pumps, piston pumps:
● No pressure surges
● Increased service life of the pipe system
Agitators, mixers:
● Reduced starting current
Fans:
● Reduced stress on gearbox and V belt
NOTICE
Risk of property damage.
Make sure no liquids, dust, or conductive objects can get inside the soft starter.
3.1.1 RS 232 serial PC interface and Soft Starter ES parameterizing and operating
software
The electronic 3RW44 soft starters have a PC interface for communicating with the Soft
Starter ES smart software and an operating and monitoring module (display).
Selection criteria
Note
You must select the size of your SIRIUS 3RW44 soft starters according to the rated motor
current (rated currentsoft starter ≥ rated motor current).
Note
For the correct dimensioning of soft starters for motors with high starting current ratios
(typically I/Ie ≥ 8), we recommend our Simulation Tool for Soft Starters (STS).
Application Conveyor belts Roller conveyors Compressor Small fans Pump Hydraulic
pumps
Starting parameters
Voltage ramp and
current limiting
• Starting voltage % 70 60 50 30 30 30
• Starting time s 10 10 10 10 10 10
• Starting time 10 10 10 10 10 10
• Starting time s 30 30 30
Torque ramp
• Starting torque 30 30 30
• Starting time 30 30 30
• Starting time s 60 60 60 60
Torque ramp
• Starting torque 20 50 50 20
• Starting time 60 60 60 60
Note
The settings and device dimensions indicated in these tables are examples only; they are
merely provided for information purposes and are not binding. Set values depend on the
application in question and must be optimized during commissioning.
ON time motor OT
The relative ON time in % is the ratio between the load duration and the cycle duration for
loads that are frequently switched on and off.
The ON time OT can be calculated using the following formula:
Switching frequency
The maximum permissible switching frequency must not be exceeded because the devices
could be damaged due to thermal overloading.
Ambient temperature
3RW44 soft starters are designed for operation with rated current at an ambient temperature
of 40 °C. If this temperature is exceeded, e.g. owing to an impermissible temperature rise in
the control cabinet, other loads, or a general increase in the ambient temperature, the
resulting deterioration in the soft starter's performance must be taken into account when the
device is dimensioned (see chapter Technical data of the power unit (Page 274)).
Note
Otherwise, drives could break away in certain circumstances due to existing parameter
assignments.
Soft starters already parameterized by users can be reset to the factory settings without the
need for additional tools.
For details of how to reset a soft starter to the factory settings, see "Restoring the delivery
condition (factory settings)" in chapter Saving options (Page 107).
3RW4* 4* 22 - 6 B* C* 4 4
I II III IV V VI VII VIII
Pe le Pe le
22 15 kW 29 A 45 160 kW 313 A
23 18.5 kW 36 A 46 200 kW 356 A
24 22 kW 47 A 47 250 kW 432 A
25 30 kW 57 A 53 315 kW 551 A
26 37 kW 77 A 54 355 kW 615 A
27 45 kW 93 A 55 400 kW 693 A
34 55 kW 113 A 56 450 kW 780 A
35 75 kW 134 A 57 500 kW 880 A
36 90 kW 162 A 58 560 kW 970 A
43 110 kW 203 A 65 630 kW 1076 A
44 132 kW 250 A 66 710 kW 1214 A
IV Type of connection
1 Standard screwed connection (main/auxiliary conductor connection)
(for units ≤ 3RW4427)
2 Main conductors: busbar connection/auxiliary conductors: Spring-loaded terminal
(for units > 3RW4427)
3 Main conductors: screwed connection/auxiliary conductors: Spring-loaded terminal
(for units ≤ 3RW4427)
6 Main conductors: busbar connection/auxiliary conductors: Screw terminal
(for units > 3RW4427)
V Special function
B With bypass
VI Number of controlled phases
C All 3 phases controlled
VII Rated control supply voltage Us:
3 115 V AC
4 230 V AC
VIII Rated control supply voltage Ue:
4 200 to 460 V
5 400 to 600 V
6 400 to 690 V
4.1.1 Unpacking
NOTICE
Do not lift the device by the cover when unpacking it as this could lead to damage.
NOTICE
Overheating of the switching device
Provide adequate cooling at the place of installation to prevent the switching device from
overheating.
Note
Coated circuit boards
All 3RW44 soft starters with a production date G/150206 onwards are equipped as standard
with coated printed circuit boards to improve protection of the device against tough ambient
conditions such as dust, moisture or other harmful influences.
NOTICE
Allow sufficient clearances for the cooling air to circulate freely. The device is ventilated
from bottom to top.
WARNING
Automatic restart
Can result in death, serious injury, or property damage.
The automatic reset mode must not be used in applications where there is a risk of serious
injury to persons or substantial damage to property if the motor starts up again
unexpectedly.
The start command (e.g. issued by the PLC) must be reset prior to issuing a reset
command, because the motor attempts to restart again automatically if a start command is
still active following this reset command. This particularly applies if the motor protection has
tripped. For safety reasons, you are advised to integrate the group fault output (terminals
95 and 96) in the controller.
General information
A motor feeder comprises at least a disconnector, a contact element, and a motor.
Line protection against short-circuits must be implemented, together with overload protection
for the line and motor.
Disconnector
The isolating function with line protection against overload and short-circuits can be achieved
with a motor starter protector or a fuse disconnector, for instance.
(For details of fuse and circuit breaker assignment, refer to chapter Feeder component
layout (standard circuit) (Page 286) and chapter Feeder component layout (inside-delta
circuit) (Page 291).
Contact element
The 3RW44 soft starter performs the functions of the contact element and motor protection.
DANGER
Hazardous voltage.
Danger to life or risk of serious injury.
If line voltage is present at the input terminals of the soft starter, hazardous voltage may still
be present at the soft starter output even if a start command has not been issued. This
voltage must be isolated by means of a disconnector (open isolating distance, e.g. with an
open switch disconnector) whenever work is carried out on the feeder.
NOTICE
Error message due to delayed switching of the contactor
If a main or line contactor is connected between the soft starter and the motor or in the
return line between the motor and the soft starter, steps must be taken to ensure that this
contactor is connected within 100 ms of activation of the start command for the 3RW44.
If the contactor is not connected within 100 ms of activation of the start command for the
3RW44, the soft starter no longer recognizes the current circuit variant (standard circuit or
inside-delta circuit). A "Missing load phase 1-3" error message is generated.
Requirements
A motor whose windings can be connected in a delta circuit where a line voltage prevails.
Example
The SIRIUS 3RW44 soft starter can be dimensioned to match the current flowing in the
motor section (58 % of the conductor current) by connecting it to the delta winding of the
motor. This requires at least 6 motor lines.
The 3RW44 soft starter automatically detects how it is connected, meaning that the
connection type does not have to be explicitly set on the device. The detected connection
type can be read on the starter in the "Status display/Type of connection" menu item. In this
case, the display reads "Inside-delta circuit". If the circuitry is faulty or the motor is not
connected, the display shows "Unknown".
NOTICE
The rated motor current given on the nameplate must always be set in the quick start menu
or in the motor adjustment menu item. This setting is independent of the soft starter's type
of connection.
Value to be set in the above example for a line voltage of 400 V, e.g. 40.5 A.
NOTICE
The DC braking and combined braking device functions are no longer available for inside-
delta circuits.
To ensure proper functioning of the soft starter, the electrical connection of the main
voltage (line and motor side) must be made according to the given circuit examples (see
chapter Connection examples for main and control circuits (Page 229)).
NOTICE
Error message due to delayed switching of the contactor
If a main or line contactor is connected between the soft starter and the motor or in the
return line between the motor and the soft starter, steps must be taken to ensure that this
contactor is connected within 100 ms of activation of the start command for the 3RW44.
If the contactor is not connected within 100 ms of activation of the start command for the
3RW44, the soft starter no longer recognizes the current circuit variant (standard circuit or
inside-delta circuit). A "Missing load phase 1-3" error message is generated.
Figure 4-6 Block diagram of a feeder with an optional main contactor / contactor disconnector
NOTICE
Error message due to delayed switching of the contactor
If a main or line contactor is connected between the soft starter and the motor or in the
return line between the motor and the soft starter, steps must be taken to ensure that this
contactor is connected within 100 ms of activation of the start command for the 3RW44.
If the contactor is not connected within 100 ms of activation of the start command for the
3RW44, the soft starter no longer recognizes the current circuit variant (standard circuit or
inside-delta circuit). A "Missing load phase 1-3" error message is generated.
NOTICE
In the case of 3RW44 product version *E08* (FWV 1.9.0) the simultaneous and/or
premature switch-off of the main contactor and removal of the ON command at the soft
starter may lead to direct-on-line starting behavior of the motor when restarting. Include a
tripping delay of 1 s for the main contactor or control the main contactor via an output with
parameterized "ON time" function as described in chapter 3RW44 in a standard circuit with
line contactor and control via PLC (Page 231).
Note
There are two possibilities of protecting against a short-circuit:
Protecting against short-circuits in accordance with type of coordination 1:
the device may be defective after a short-circuit and must be replaced. Chapter Feeder
component layout (standard circuit) (Page 286) contains details of fuses/circuit breakers for
short-circuit protection in accordance with type of coordination 1.
Protecting against short-circuits in accordance with type of coordination 2:
the device is not damaged by a short-circuit. Type of coordination 2 is recommended for high
plant availability. The soft starter has internal protection to prevent overloading of the
thyristors during normal operation. This internal thyristor protection function is not sufficient,
however, in the event of a defect in the motor windings or a short-circuit in the motor's power
supply cable, for example. Special semiconductor fuses, e.g. SITOR fuses from SIEMENS,
must be used for this purpose.
NOTICE
Risk of property damage
Type of coordination 1 in accordance with IEC 60947-4-1: The device is defective following
a short-circuit failure and therefore unsuitable for further use (personnel and equipment
must not be put at risk). Type of coordination 2 in accordance with IEC 60947-4-1: The
device is suitable for further use following a short-circuit failure (personnel and equipment
must not be put at risk). The type of coordination only refers to soft starters in conjunction
with the stipulated protective device (motor starter protector/fuse), not to additional
components in the feeder.
NOTICE
Capacitors must not be connected to the output terminals of the soft starter. If so, the soft
starter will be damaged.
Active filters, e.g. for power factor correction, must not be operated parallel to the motor
control device.
If capacitors are to be used to correct the power factor, they must be connected on the
device's line side. If a contactor disconnector or main contactor are used together with the
electronic soft starter, the capacitors must be disconnected from the soft starter when the
contactor is open.
Note
The direction of power flow is also irrelevant for the overload relay integrated in the 3RW44
soft starters. This means that motor protection is guaranteed in all cases, regardless of
whether motor or generator operation is concerned.
Size 3RW44 2.
An additional box terminal for direct cable connection is supplied as standard with size
3RW44 2.
1. A1, A2, PE, L+, L-, IN1, IN2, IN3, IN4, T1, T2, 13, 14, 23, 24, 33, 34, 95, 96, 98:
Control/auxiliary circuit
2. L1/L2/L3
Main circuit infeed
3. T1/T2/T3
Main circuit outgoing feeder load
NOTICE
A1, A2, PE, L+, L-, IN1, IN2, IN3, IN4, T1, T2, 13, 14, 23, 24, 33, 34, 95, 96, 98
3RW44..-1.... 3RW44..-2....
3RW44..-6.... 3RW44..-3....
0.8…1.2 Nm -
7 to 10.3 lb.in
∅ 5…6 mm/PZ2
1 x 0.5…4.0 mm2 2 x 0.25…1.5 mm2
2 x 0.5…2.5 mm2
2 x 2.5…35 mm2 -- -- -- -- -- --
1 x 2.5…50 mm2
2 x 10…50 mm2 -- -- -- -- -- --
1 x 10…70 mm2
2 x AWG 10…1/0
1 x AWG 10…2/0
Graphic display
There is a graphic display on the front of the device from which the functions and states of
the soft starter can be read in plain text and with the help of symbols when control voltage is
applied.
① Shows the operator panel that ② Indicates the user level setting ③ Indicates the current motor status
currently has control priority and is thus
issuing the control commands for the
motor.
Display with keys Customer read only No motor
No control device
Operator controls
There are four keys for operating and adjusting the soft starter:
The current function, depending on the menu item, is shown as text on the display above this
key (e.g. select menu, change value or save settings).
The current function, depending on the menu item, is shown as text on the display above this
key (e.g. select menu, change value or save settings).
The ESC key is used to quit the current menu item and to jump back to the higher-level
menu item.
Menu structure
WARNING
Before switching the device on for the first time, verify that the main/control side is wired
properly. Make sure that the line and control voltages comply with the device-specific
requirements (refer to chapter Technical data (Page 268)).
Note
This table provides example settings. They are intended for information purposes only and
are not binding. Set values depend on the application in question and must be optimized
during commissioning.
6.2.2 Quick start menu, when switching on for the first time
The motor does not swiftly reach its nominal rotational speed in the desired time
Note
After applying the control supply voltage for the first time, you will automatically be in the
quick start menu, which you must go through once to commission the soft starter for the first
time.
In the quick start menu, you need to enter the information needed to preset the most
important parameters of the soft starter for your application. Starting parameters for typical
types of applications are stored in the device parameters.
To achieve optimum motor starting, these parameters may need to be optimized on the
basis of the connected load using the "Settings" menu item, as described in chapter
Specifying the startup mode (Page 68).
If your particular load is not listed, select any load and optimize the defined parameters, if
necessary, using the "Settings" menu item as described in chapter Specifying the startup
mode (Page 68). The values of the basic factory settings of the parameters, and the
predefined assignment of the control inputs and outputs, are listed in chapter Technical data
(Page 268).
Note
If you confirm the last item "Save settings - execute?" by entering "Yes" in the quick start
menu, you can only return to this menu by resetting the device to its basic factory settings
(refer to "Restoring the factory settings" in chapter Saving options (Page 107)). This
overwrites all settings made up to that point.
NOTICE
The setting is buffered in a Flash EPROM memory as soon as you change a setting in
the menu and execute it using the "OK" button. It is then active in the soft starter as from
this moment onwards. When the control supply voltage is switched off, this value will be
canceled and the previous value restored. To permanently save the settings made in the
soft starter, you must save the data as described in chapter Settings main menu item
(Page 64) and chapter Saving options (Page 107).
Note
Always set the rated operating current of the motor stated on the motor nameplate based on
the prevailing line voltage. This setting is independent of the type of connection of the soft
starter (soft starter in standard or inside-delta circuit). Value to be set in the above example
for a line voltage of 400 V, e.g. 40.5 A.
The motor current of the connected drive should be set to ensure proper functioning of the
soft starter during starting and stopping, as well as with regard to motor protection.
Rated torque
If the motor's rated torque is not indicated on the nameplate, it can be calculated using the
following formula:
Example
If no value is specified, the value of the basic factory setting is active (0 Nm).
When the start command is given and the motor is connected, the soft starter automatically
calculates the required value once.
Note
If a motor with rated data (current, speed, torque) that differs from the values already entered
is connected to the soft starter (e.g. for testing purposes), this rated data must be adapted to
the new motor. If 0 Nm is entered as the rated torque, the value is automatically calculated
once by the soft starter.
Limiting torque
NOTICE
* The parameter value should be set to approx. 150 % to start the motor. It should be high
enough to ensure that the motor does not become stuck during run-up. This ensures that
enough acceleration torque is generated throughout the motor run-up phase.
CAUTION
May lead to damage to property.
The "Motor heating" startup mode is not a continuous operating mode. The motor must be
equipped with a temperature sensor (Thermoclick/PTC) to ensure motor protection. The
motor model with integrated electronic motor overload protection is not suitable for this kind
of operation.
NOTICE
Note
If the "DC braking" function is selected, the "DC braking contactor" function must be
assigned to one output of the soft starter. This output must be used to control an external
braking contactor.
NOTICE
Note
For operation of the motor with the specified slow speed parameters, the "Slow speed"
function must be assigned to one control input, and the "Motor CW PS1/2/3" or "Motor CCW
PS1/2/3" function must at the same time be assigned to the other. See also Chapter 3RW44
in a standard circuit with soft start/stop and additional slow speed function in both directions
of rotation with one parameter set (Page 237).
Directions of rotation:
● Right (CW): rotation in line phase direction
● Left (CCW): rotation opposite to the line phase direction
Note
An input action can only be modified when the relevant input is not active.
NOTICE
If the same action is assigned to two different inputs, both of the inputs must also be
controlled to carry out the selected function (e.g. to obtain logical "AND" linking for a start
command, assign the "Motor CW PS1" function to both inputs 1 and 2. A start command is
accepted only if both inputs are active).
NOTICE
If the soft starter is switched off via a motor protection or inherent device protection tripping,
the action cannot be acknowledged using the "Trip Reset" function until the displayed
cooling time has expired.
temperature sensor open circuit, temperature sensor short circuit, temperature sensor
overload, maximum starting time exceeded, Ie exceeded/undershot, ground fault detected,
inadmissible Ie class setting: In the case of these faults, the motor can be started via the
emergency start function despite a pending group fault. An emergency start action is
assigned to one input, and, for example, "Motor CW > parameter set 1" to another. The
emergency start is active as long as the input is activated. It can also be activated during
operation.
4) Slow speed: The motor starts with the values set in the "Slow speed parameters" menu
item when the "Slow speed" input and the "Motor CW/CCW parameter set 1/2/3" inputs are
activated at the same time.
5) Quick stop: If the input is activated, normal tripping with the currently set stopping function
is executed (no group fault appears). The quick stop is executed independently of the control
priority.
6) Trip reset: Pending faults can be acknowledged after rectification.
7) Motor CW parameter set 1/2/3: The motor starts (with rotation in line phase direction) and
8) Motor
CCW parameter set 1/2/3: This function is active only when the "Slow speed"
parameter is active at the same time. The motor starts with the values stored in the "Slow
speed parameters" menu item (with rotation opposite to the line phase direction).
Note
The "Trip Reset" input is edge-controlled. The level change from 0 to 24 V DC is evaluated
at the input. All other input functions are evaluated at the already pending 24 V DC level.
Note
1) For
possible group warnings/group faults, see chapter Warnings and group faults
(Page 150).
Note
For switching delay times of the output functions, see chapter Technical data of the control
section (Page 279).
NOTICE
In the case of heavy starting and set values of tripping class ≥ CLASS 20, we recommend
setting the "Prewarning limit tripping reserve" parameter value to 0 s (deactivated) and
increasing the "Prewarning limit motor heating" parameter to 95 %. Otherwise, a motor
protection warning will be issued when starting.
NOTICE
If a CLASS setting other than 5(10a) or 10 is selected, it may be necessary to check and
adjust the set values for the rated operating current Ie of the motor (chapter Entering the
motor data (Page 66)) in all 3 parameter sets, since otherwise the "Impermissible Ie/CLASS
settings" error message may be issued.
For the maximum permissible set value for the rated operating current Ie of the motor based
on the CLASS settings, refer to chapter Technical data of the power unit (Page 274).
NOTICE
NOTICE
The internal motor overload protection of the SIRIUS 3RW44 soft starter must be
deactivated for this kind of installation! (Set value in the "Motor protection/Tripping class"
menu item: "None" and Motor protection/Temperature sensor: "Deactivated")
Note
* The ground fault function is only active after completion of run-up, not during startup.
Note
If the "Parameters disabled CPU/Master" parameter is set to "Off" (factory setting), the
parameters set on the soft starter will be overwritten with the values stored in the GSD file or
in the OM when the bus is started. If this is not desired, the parameter must be set to "On".
NOTICE
As long as the connected drive is controlled by the soft starter, no parameter changes
carried out at the same time can be saved by means of the "Saving options" menu item.
This is only possible after the motor has been shut off by the soft starter.
Saving settings
Restoring settings
Selected settings that have not been saved will be discarded and the previously saved
settings will be restored.
Note
When using the 3RW44 soft starter in an IT system with ground fault monitoring: 3RW44,
product version < *E06* and the PROFIBUS DP communication module must not be used in
this network configuration. 3RW44 soft starters from product version *E07* onwards can be
used in combination with the PROFIBUS DP communication module. However, the phase
voltage values (UL-N) and phase-to-phase voltage values (UL-L) may be displayed
incorrectly on the measured value display of the 3RW44.
Note
PROFINET communication modules can only be used with a product version of *E12* or
later.
Note
The "Phase currents" display always shows the currents in the supply cable. This means
that, if the soft starter is operated in the "Inside-delta circuit" circuit type, the currents
measured internally by the soft starter are extrapolated to the supply cable current (phase
current) by a factor of 1.73 and are displayed.
Due to unbalance, the phase currents displayed in the inside-delta circuit may deviate from
the currents that are actually running through the supply cables.
NOTICE
The "Standard control" menu item specifies which control device should be given control
priority when the control supply voltage is applied.
When the PROFIBUS/PROFINET communication module is activated, the setting is
changed to "Automatic/None".
6.5.4 Statistics
Statistics
NOTICE
The "Statistics" menu item is available for devices with firmware product version *E04* or
higher. The firmware product version is listed on the front of the device below the petrol-
colored labeling field. The "Logbooks" sub-item can only be used in combination with "Soft
Starter ES" parameterizing and diagnostics software. This menu item will be available in
the device display from 04/2006.
Logbooks
Note
The "Statistics" menu item is available for devices with firmware product version *E04* or
higher. The firmware product version is listed on the front of the device below the petrol-
colored labeling field. The "Logbooks" sub-item can only be used in combination with "Soft
Starter ES" parameterizing and diagnostics software. This menu item will be available in the
device display from 04/2006.
Note
Logbooks cannot be deleted while the motor is running.
Maximum pointer (minimum and maximum measured values are stored and displayed)
NOTICE
The "Statistics" menu item is available for devices with firmware product version *E04* or
higher. The firmware product version is listed on the front of the device below the petrol-
colored labeling field. The "Logbooks" sub-item can only be used in combination with "Soft
Starter ES" parameterizing and diagnostics software.
Statistical data
NOTICE
The "Statistics" menu item is available for devices with firmware product version *E04* or
higher. The firmware product version is listed on the front of the device below the petrol-
colored labeling field. The "Logbooks" sub-item can only be used in combination with "Soft
Starter ES" parameterizing and diagnostics software.
Note
Number of starts motor CCW, only possible in combination with slow speed.
Note
Number of stops with el. brake: The value is incremented by 1 when braking has been
chosen as the coasting method.
Note
The value is incremented by 1 each time the output is set.
Note
The operating hours counter is activated as soon as control voltage is applied to the soft
starter. Maximum value displayed: 99999:59:59 hours
Applications
● Starting Dahlander motors (variable-speed drive).
● Starting an application with different load conditions (e.g. empty or full conveyor belt).
● Separate starting of up to three drives with different run-up behavior (e.g. compressor and
pump).
Starting voltage
The starting voltage determines the starting torque of the motor. A lower starting voltage
results in a lower tightening torque and a lower starting current. The starting voltage should
be selected such that the motor starts up immediately and smoothly once the start command
goes to the soft starter.
Starting time
The length of the starting time determines the time during which the motor voltage is
increased from the parameterized starting voltage to the supply voltage. This has an
influence on the motor's acceleration moment, which drives the load during the ramp-up
operation. A longer starting time has a smaller acceleration moment throughout the motor
ramp-up. The latter is therefore longer and smoother. The length of the starting time should
be selected so that the motor reaches its rated speed within this period. If the time selected
is too short, in other words if the starting time ends before the motor has started up
successfully, a very high starting current that equals the direct starting current at the same
speed occurs at this instant. The soft starter can, in this case, switch itself off via the internal
overload protection function and go into fault mode.
Figure 7-2 Principle of the voltage ramp for the torque characteristic
Starting torque
The starting torque determines the switch-on torque of the motor. A lower starting torque
results in a lower locked-rotor torque and a lower starting current. The starting torque
selected must be sufficiently high to ensure that the motor starts straight away and smoothly
when the start command is issued to the soft starter.
Limiting torque
The limiting torque value specifies the maximum torque to be generated in the motor during
startup. This value also functions as an adjustable torque limit, for example.
The parameter value should be set to approx. 150 % to start the motor. It should be high
enough to ensure that the motor does not become stuck during run-up. This ensures that
enough acceleration torque is generated throughout the motor run-up phase.
Starting time
The length of the starting time determines the time in which the starting torque is increased
to the end torque.
A longer starting time results in a smaller acceleration torque over the motor run-up. This
results in a longer and smoother motor run-up. The length of the starting time should be
selected in such a way that the motor accelerates softly until it reaches its nominal speed.
If the starting time ends before the motor has completely run up, the torque is limited to the
set limiting torque until the soft starter recognizes the run-up process and closes the internal
bypass contacts.
NOTICE
The torque generated in the motor and controlled by the soft starter can never be higher
than the value of a similar direct on-line starting operation at the associated speed.
7.2.3 Breakaway pulse in combination with the voltage ramp or torque control startup
mode
This function is required for load machines with inverse torque behavior. Typical applications
are mills, crushers or drives with plain bearings. In such cases, it may be necessary to create
a breakaway pulse at the beginning of the machine's start process. The breakaway pulse is
set via the breakaway voltage and the breakaway time. Using the breakaway pulse, the high
limiting friction of the load can be overcome and the machine can be set into motion.
The breakaway pulse is used in conjunction with the start type of the voltage ramp, the
torque control, or the current limitation and overlays this during the set breakaway time.
Breakaway voltage
The breakaway voltage is used to set the breakaway torque to be generated. The breakaway
torque can be up to 100% of the locked-rotor torque generated during direct-on-line starting.
The pulse must be high enough to ensure that the motor starts rotating as soon as the start
command is issued to the soft starter.
Breakaway time
The breakaway time determines the period during which the breakaway voltage is to be
present. Once the breakaway time has expired, the soft starter ends its run-up procedure
with the selected startup mode, e.g. the voltage ramp or torque control. The selected
breakaway time should be at least long enough so that, after the set time has elapsed, the
motor does not remain stationary again but rather directly continues to accelerate in the
selected startup mode
If 0 ms is set as the breakaway time (default), the breakaway pulse function is deactivated.
Note
A breakaway pulse that is set too high may lead to the "Current measurement range
exceeded" error message.
Remedy: use a larger starter dimension or a lower breakaway voltage.
Set the breakaway pulse only when it is really required (e.g. for mills and crushers).
A wrongly set breakaway pulse, e.g. for pumps, may lead to the "Incorrect start conditions"
error message.
7.2.4 Current limitation in combination with the voltage ramp or torque control startup
mode
The starter measures the phase current (motor current) continuously with the help of
integrated current transformers.
A current limiting value can be set on the soft starter while the motor is starting up.
Current limiting can be activated when "voltage ramp + current limiting" or "torque control +
current limiting" has been selected as the startup mode and a value has been entered in the
applicable parameter.
During starting, the phase current is limited to the set value until this value is undershot. A
set breakaway pulse is superimposed on the current limitation during the breakaway time.
Ramp-up detection
The soft starter features internal run-up recognition. If it detects a motor ramp-up, the motor
voltage is immediately increased to 100% of the line voltage. The internal bypass contacts
close and the thyristors are bridged.
Note
Due to the motor's high starting current, the "current limit exceeded" fault can occur in the
case of the "direct" startup mode. It may be necessary to select a larger soft starter.
Ramp-up detection
The soft starter features internal ramp-up detection. If a completed motor ramp-up is
detected, the internal bypass contacts close and the thyristors are bridged.
CAUTION
May lead to damage to property.
The motor heating startup mode is not a continuous operating mode. The motor must be
equipped with a temperature sensor (Thermoclick/PTC) to ensure motor protection. The
motor model with integrated electronic motor overload protection is not suitable for this kind
of operation.
Note
If you select a controlled stop (soft stop or pump stop or braking) as the coasting method, the
feeder (soft starter, cables, feeder protective devices, and motor) may need to be
dimensioned for higher values because the current exceeds the rated motor current during
the stop process.
Pump stop
In pump applications, so-called water hammers can occur if the drive is stopped abruptly
without using pump stop. Water hammers are caused by the sudden stall and the
accompanying pressure deviations in the pump. They cause noise and mechanical impacts
on the piping system, as well as on any flaps and valves installed there.
CAUTION
Risk of property damage
For optimum motor protection, use the combination of electronic motor overload
protection and evaluation of a temperature sensor installed in the motor.
Note
The DC braking/combined braking stopping function is not possible in inside-delta circuits.
Note
The pulsating direct current loads the system asymmetrically and the motor and the feeder
must be designed for the higher current load during the stopping procedure. It may be
necessary to overdimension the soft starter.
Note
Two braking variants are available:
Combined braking:
Use the combined braking function if applications with small mass inertias (centrifugal
masses) are to be stopped (Jload ≤ Jmotor). The real coast-down time can vary during braking
operations when the combined braking function is applied. Use the DC braking function if a
uniformly long braking time is to be achieved.
DC braking:
Use the DC braking function if applications with small mass inertias (centrifugal masses) are
to be stopped (Jload ≤ 5 x Jmotor). An external braking contactor is required for the DC
braking function.
CAUTION
Risk of property damage.
For optimum motor protection, the combination of electronic motor overload protection and
evaluation of a temperature sensor installed in the motor is recommended.
DC braking torque
The motor's brake force can be set with the amount of the DC braking torque. The dynamic
braking torque must be increased if the motor is to accelerate again during DC braking.
Coast-down time
The coast-down time specifies the period during which the DC braking torque is to be
generated on the motor. The chosen braking time should be long enough to bring the load to
a standstill. To achieve an adequate braking effect down to standstill, the centrifugal mass
(J) of the load should not exceed that of the motor. The length of the coast-down time should
be chosen so that the motor comes to a standstill. Standstill detection does not take place in
the soft starter and, if required, must be realized by means of external measures.
Note
The real coast-down time can vary during braking operations when the combined braking
function is applied.
DC braking torque
The motor's brake force can be set with the amount of the DC braking torque.
Coast-down time
The coast-down time specifies the period during which the DC braking torque is to be
generated on the motor. The chosen braking time should be long enough to bring the load to
a standstill.
To achieve an adequate braking effect down to standstill, the load's moment of inertia should
not exceed a maximum of 5 times that of the motor. (Jload ≤ 5 x Jmotor).
Standstill detection does not take place in the soft starter and, if required, must be realized
by means of external measures.
A resulting slow speed frequency is stipulated for the motor by a specific thyristor control.
However, it is necessary for this function that only a reduced torque can be generated in the
motor. Due to possible heat rise of the motor, this function is not suitable for continuous
operation.
The slow speed factor and the slow speed torque can be entered individually for both
directions of rotation.
Note
In addition to the set parameters, motor-specific characteristics and the connected load
influence the speed resulting from the slow speed function and the slow speed torque
generated in the motor.
Note
For operation of the motor with the specified slow speed parameters, the "slow speed"
function must be assigned to one control input, and the "Motor CW PS1/2/3" or "Motor CCW
PS1/2/3" function must at the same time be assigned to the other. See also the circuit
suggestion in chapter Typical circuit diagrams (Page 229).
Directions of rotation:
Right (CW): Rotation in line phase direction
Left (CCW): Rotation contrary to the line phase direction
Note
Due to the reduced motor speed and the related reduced self-cooling of the motor, this mode
is not recommended for continuous operation.
CAUTION
Risk of property damage
For optimum motor protection, use the combination of electronic motor overload protection
and evaluation of a temperature sensor installed in the motor.
Note
The rated data of the soft starters refers to normal starting (CLASS 10). The starters may
need to be calculated with a size allowance for heavy-duty starting (> CLASS 10).
Idle time
The idle time is a time defined for cooling of the motor model following an operational
shutdown, i.e. not after overload trips.
After this time, the "thermal motor model" of the motor starter is set to 50 % when motor heat
rise is still > 50 %, otherwise it is set to 0 %. Frequent starts (inching mode) are also possible
as a result. These lead to tripping where motor protection in accordance with IEC 60947 is
used, depending on the CLASS setting.
The following schematic diagram shows the cooling behavior with and without idle time.
CAUTION
Risk of property damage
Motor protection in accordance with IEC 60947 (CLASS 10A, 10, 15, 20, 30) is no longer
provided if the idle time is changed (0 = deactivated). This means that there will be no
system protection in such cases. Parallel protective measures are recommended.
CAUTION
Risk of property damage
The motor must be designed for such inching operation as otherwise permanent damage
may arise due to overload.
Recovery time
A recovery time, during which the motor cools down and cannot be restarted, starts if the
thermal motor model is tripped.
Temperature sensor
This motor protection function measures the motor's stator winding temperature directly with
the help of a sensor installed in the motor, in other words the motor must have a sensor
wound into the stator winding.
You can choose between two different sensor types for the evaluation.
1. PTC thermistors Type A ("type A sensors")
2. Thermoclick sensors
The wiring and the sensors are checked for wire breakage and short-circuits.
Note
If the soft starter is switched off via a motor protection or inherent device protection tripping,
the action cannot be acknowledged using the "Trip Reset" function until the displayed
cooling time has expired.
Note
If the soft starter is switched off via a motor protection or inherent device protection tripping,
the action cannot be acknowledged using the "Trip Reset" function until the displayed
cooling time has expired.
Message Cause/solution
Check voltage The main voltage is not yet applied.
Check the line phases Option 1: Main voltage is applied, but the motor is not yet connected or is not yet
connected correctly.
Option 2: The motor is connected correctly, but there is no phase voltage.
Ready to start Device is ready (main voltage is applied and motor is connected correctly).
The motor starts as soon as a start command is issued.
Starting active Motor is started with the selected startup mode.
Motor running Device is in bypass mode (bypass contactor). Start-up completed.
Coast down active Motor is stopped with the selected coasting method.
Motor cooling time active (for devices After an overload trip of the thermal motor model, starting of the motor is not
with product version < *E06*) possible for a certain period of time (parameter: recovery time), to ensure that the
motor can cool down.
Switching element cooling time After the device's intrinsic protection mechanism has tripped because of an
(for devices with product version overload, the motor cannot be started for 30 s to allow the device to cool down.
< *E06*)
Emergency start active The emergency start function is activated.
Quick stop active The quick stop function is activated.
Message ① ② ③ Cause/solution
No supply voltage x 1. Start command has been issued although the main voltage is not
yet applied.
Remedy: Switch on the supply voltage.
2. If the message occurs in the bypass mode, it may have been
generated erroneously by a too frequently generated "Prewarning
limit - motor heating", "Remaining time for tripping" or "Ie limit
exceeded/undershot" warning (can also be traced via the entries in
the logbook/events).
Remedy: See description of applicable messages
3. Main voltage is removed simultaneously with the ON command,
although run down (not "Coasting down") is parameterized.
Remedy: Activate line contactor by means of output parameterized
to ON time or parameterize "Coasting down".
Incorrect starting conditions x 1. Fault occurs without motor starting.
(for devices with product version
< *E04*) Cause:
Phase angle control faults – Motor has not been connected correctly.
(for devices with product version – Inside-delta circuit is wrongly configured.
≥ *E04*) – There is a ground fault.
Remedy: Check and correct wiring (see circuit suggestions for
inside-delta circuit).
2. Fault occurs during starting.
Cause:
– Chosen starting voltage too high
– Breakaway pulse (wrongly) set: Motor starting becomes
unstable
(set the breakaway pulse only when it is really required. In the case
of pumps, for example, a breakaway pulse often leads to misfiring.)
If there is an idle time < 5 s since the last start, the 3RW44 starts
with a higher starting voltage. In combination with a set breakaway
pulse, this can lead to "incorrect starting conditions".
Message ① ② ③ Cause/solution
Phase failure L1 x Option 1: Phase L1 is missing or fails or drops while the motor is
running.
Tripped as a result of a dip in the permissible rated operational voltage
> 15 % for > 100 ms during the startup process or > 200 ms in bypass
mode.
Remedy: Connect L1 or rectify the voltage dip.
Option 2: The motor that is connected is too small and the fault occurs
as soon as it is switched to bypass mode.
Remedy: Set the correct rated operational current for the connected
motor or set it to the minimum value (if the motor current is less than
10 % of the set Ie, the motor cannot be operated with this starter).
Option 3: Starter used in IT system with ground-fault monitoring:
3RW44, product version < *E06* and the PROFIBUS DP
communication module must not be used in this network configuration.
Remedy: Replace starter with 3RW44, product version ≥ *E07*. Here,
use in combination with the PROFIBUS DP communication module is
admissible. However, the phase voltage values (UL-N) and phase-to-
phase voltage values (UL-L) may be displayed incorrectly on the
measured value display of the 3RW44.
Phase failure L2 x Option 1: Phase L2 is missing or fails or drops while the motor is
running.
Tripped as a result of a dip in the permissible rated operational voltage
> 15 % for > 100 ms during the startup process or > 200 ms in bypass
mode.
Remedy: Connect L2 or rectify the voltage dip.
Option 2: A motor that is not powerful enough is connected and the
fault occurs as soon as a switchover is made to bypass mode.
Remedy: Set the correct rated operational current for the connected
motor or set it to the minimum value (if the motor current is less than
10 % of the set Ie, the motor cannot be operated with this starter).
Option 3: Starter used in IT system with ground-fault monitoring
3RW44, product version < *E06* and the PROFIBUS DP
communication module must not be used in this network configuration.
Remedy: Replace starter with 3RW44, product version ≥ *E07*. Here,
use in combination with the PROFIBUS DP communication module is
admissible. However, the phase voltage values (UL-N) and phase-to-
phase voltage values (UL-L) may be displayed incorrectly on the
measured value display of the 3RW44.
Message ① ② ③ Cause/solution
Phase failure L3 x Option 1: Phase L3 is missing or fails/collapses when the motor is in
operation.
Tripped as a result of a dip in the permissible rated operational voltage
> 15 % for > 100 ms during the startup process or > 200 ms in bypass
mode.
Remedy: Connect L3 or rectify the voltage dip.
Option 2: A motor that is not powerful enough is connected and the
fault occurs as soon as a switchover is made to bypass mode.
Remedy: Set the correct rated operational current for the connected
motor or set it to the minimum value (if the motor current is less than
10 % of the set Ie, the motor cannot be operated with this starter).
Option 3: Starter used in IT system with ground-fault monitoring
3RW44, product version < *E06* and the PROFIBUS DP
communication module must not be used in this network configuration.
Remedy: Replace starter with 3RW44, product version ≥ *E07*. Here,
use in combination with the PROFIBUS DP communication module is
admissible. However, the phase voltage values (UL-N) and phase-to-
phase voltage values (UL-L) may be displayed incorrectly on the
measured value display of the 3RW44.
Missing load phase T1 x Motor phase T1 is not connected.
Remedy: Connect the motor properly.
Missing load phase T2 x Motor phase T2 is not connected.
Remedy: Connect the motor properly.
Missing load phase T3 x Motor phase T3 is not connected.
Remedy: Connect the motor properly.
Supply voltage below 75 % x Control supply voltage is less than 75% of the required rated voltage for
more than 100 ms (voltage failure, voltage dip, incorrect control supply
voltage).
Remedy: Check the control supply voltage.
Supply voltage below 85% x Control supply voltage is less than 85 % of the required rated voltage
for more than 2 s (voltage failure, voltage dip).
Remedy: Check the control supply voltage.
Supply voltage above 110% x Control supply voltage is more than 110 % of the required rated voltage
for more than 2 s (voltage peaks, incorrect control supply voltage).
Remedy: Check the control supply voltage.
Current unbalance exceeded x x The phase currents are asymmetrical (unbalanced load). Message is
output when the asymmetry is greater than the set limit (parameter:
Current asymmetry limit value).
Remedy: Check the load or modify the parameter value.
Message ① ② ③ Cause/solution
Thermal motor model overload x x x The thermal motor model has tripped. After an overload trip, restarting
is inhibited until the recovery time has elapsed.
Remedy in the event of unwanted tripping:
• Check whether the motor's rated operational current Ie is set
correctly, or
• Change the CLASS setting, or
• Possibly reduce the switching frequency, or
• Deactivate the motor protection (CLASS OFF)
Prewarning limit - motor heating x Motor heating is greater than the set parameter value: Prewarning limit
- motor heating. The thermal motor model approaches an overload trip
depending on the set value. For heavy starting and set values of
tripping class ≥ CLASS 20, we recommend increasing the "Prewarning
limit motor heating" parameter to 95 %.
Remaining time for tripping x Time up to overload trip of the thermal motor model is shorter than the
undershot set "Prewarning limit - remaining time for tripping" parameter.
In the case of heavy starting and set values of tripping class ≥ CLASS
20, we recommend setting the "Prewarning limit - remaining time for
tripping" parameter value to 0 s (deactivated).
Line overvoltage x Applied 3-phase line voltage is not suitable for the device or prolonged
(for devices with product version voltage peaks arise.
< *E04*) Tripping is caused by exceeding of the permissible rated control supply
Line voltage too high voltage of >10 % >500 ms. As from product version *E02*, the internal
(for devices with product version threshold for tripping has been increased to >18 % >2000 ms.
≥ *E04*) Remedy: Apply the correct voltage.
Current measuring range overshot x 1. A very high current has occurred (above the measuring range of the
current transformers integrated in the soft starter). This can occur in
the event of: direct-on-line starting, breakaway pulse or combined
braking.
Remedy: In the case of the "Voltage ramp" start type, extend the
set ramp time and reduce the breakaway voltage or the braking
torque. The soft starter is possibly dimensioned too small for the
motor.
2. If the message occurs during starting, it may have been generated
erroneously by a too-frequently generated "Prewarning limit - motor
heating", "Remaining time for tripping" or "Ie limit
exceeded/undershot" warning (can also be traced via the entries in
the logbook/events).
Remedy: See description of applicable messages.
Trip - motor blocked x A very high current suddenly arises in bypass mode, e.g. if the motor
(devices with product version blocks (I > 4 x IeMotor over 100 ms).
<*E07* only) Remedy: Check the motor.
Current range exceeded x More than 6 times the device's rated operational current flowed for a
prolonged period.
Remedy: Activate current limiting or check dimensioning (device and
motor).
Message ① ② ③ Cause/solution
Power unit overheated x x Overload trip of the thermal model for the power unit
Remedy: Wait until the device has cooled down again, possibly set
lower current limiting for starting, or reduce the switching frequency
(too many consecutive starts).
Check whether the motor is blocked or whether the ambient
temperature in the soft starter's environment is too high (derating as
from 40 °C; see chapter Technical data (Page 268)).
Power unit overtemperature x Temperature of the thermal model for the power unit is above the
allowed continuous operating temperature.
Remedy: Check the motor's operational current or check whether the
ambient temperature in the soft starter's environment is too high
(derating as from 40 °C; see chapter Technical data (Page 268)).
Temperature sensor short-circuit x x x Temperature sensor at terminals T1/T2 has short-circuited.
Remedy: Check the temperature sensor.
Temperature sensor wire break x x x Temperature sensor at terminals T1/T2 is defective, a cable is not
connected or no sensor is connected.
Remedy: Check the temperature sensor or if no sensor is connected:
deactivate the temperature sensor.
Temperature sensor overload x x x Temperature sensor at terminals T1/T2 has tripped. The motor is
overheated.
Remedy: Wait until the motor has cooled down and check the motor if
necessary.
Maximum starting time exceeded x The set maximum starting time is shorter than the motor's actual
ramp-up time.
Remedy: Extend the "max. starting time" parameter, increase the
current limiting value or check the load connected to the motor to
determine whether there is a mechanical defect.
Ie limit value exceeded/undershot x x Set current limit has been exceeded or undershot, e.g. due to a
clogged fan filter or by the motor stalling.
Remedy: Check the cause of current limit violation on the motor/load
or adjust the limits according to the existing load conditions.
Ground fault detected x x One phase is connected to ground (only possible in bypass mode)
Remedy: Check connections and wiring.
Manual mode local connection x The connection to the PC has been interrupted (if control via PC) or no
break key has been pressed (if the motor is key-controlled) for a prolonged
time (see Settings > Display > Activity monitoring time in chapter
Selecting display settings (Page 102)).
Control is handed over to the inputs if these have requested control
priority.
Remedy: Connect the PC again or increase the activity monitoring time
and press a key at regular intervals.
Message ① ② ③ Cause/solution
Impermissible Ie/CLASS setting x The rated operational current Ie set for the motor (chapter Entering the
motor data (Page 66)) in at least one of the three parameter sets
exceeds the associated, maximum permissible setting current referred
to the selected CLASS setting (chapter Selecting motor protection
settings (Page 99)). In the case of devices with product version
≥ *E07*, the corresponding parameter set (PS) in which the incorrect
value is to be found is displayed.
For the maximum permissible settings, see chapter Technical data
(Page 268).
If the soft starter is connected in an inside-delta circuit, the motor
feeder may have been incorrectly wired (chapter 3RW44 in an
inside-delta circuit (Page 234)); as a result, the "Status
display/Connection type" menu item (chapter Status display
(Page 114)) contains "Unkn./Fault".
Remedy: Check the rated operational current set for the motor in all
three parameter sets, select a lower CLASS setting, or calculate the
soft starter with a size allowance. In the case of an inside-delta circuit,
check that the wiring of the motor feeder corresponds to the specified
circuit diagrams.
As long as the motor is not activated, it is only a status message.
However, the message becomes a fault without restart if a start
command is issued.
No external starting parameters x Occurs only during operation with PROFIBUS DP. Incorrect or
received (devices with product impermissible parameter values have been sent by the PLC.
version ≥ *E06*) Remedy: The Soft Starter ES software can be used to read the
incorrect parameter and to change it to a permissible value.
PIO error (devices with product x PIO error (faulty process image of the outputs) appears
version ≥ *E06*)
• If Motor CW and Motor CCW have been selected simultaneously
(cause 1) or
• If Parameter set 4 has been selected via the PLC (cause 2).
Remedy:
• Automatically reset if Motor CW and Motor CCW are deactivated
again (in response to cause 1) or
• If a valid parameter set (PS 1 - 3) is set again (in response to
cause 2).
Bypass element protective tripping x A very high current occurs in bypass mode. The tripping operation
(devices with product version depends on the duration of the current and strength of the current.
≥ *E07*) Fault can only be reset after 30 s (for cooling down).
Remedy: Check the motor and check soft starter dimensioning.
Message Cause/solution
Switching element defective At least one bypass element has welded and/or at least one thyristor has fused. This
(for devices with product version message is generated when the control supply voltage is applied and current flow is
≥ *E04*) being measured (via the soft starter) when no start command has been issued.1)
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Contact 1 failed Thyristor in phase L1 failed (This message is issued when the start command is
issued.)1)
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Contact 2 failed Thyristor in phase L2 failed (This message is issued when the start command is
issued.)1)
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Contact 3 failed Thyristor in phase L3 failed (This message is issued when the start command is
issued.)1)
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Flash memory error The device memory is faulty.
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Device not named Device not named, still has to receive naming data.
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Incorrect name version The naming and firmware versions do not match.
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Bypass element defective The bypass contactor is welded or defective.
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
Message Cause/solution
Heatsink temperature sensor wire Option 1: The temperature sensor on the heatsink of the starter is not connected or
break defective.
Option 2: 3RW4465 and 3RW4466 may have a defective fan on the front of the
starter.
Remedy: Only in the case of 3RW4465 and 3RW4466: After about 30 to 60 minutes
cooling time, try to rectify the fault by switching the control supply voltage off and
then on again. If this was successful, check whether the fan on the front of the soft
starter is running when the start command is issued. If not, it may be necessary to
replace the fan. (The fan on the front of the starter and also the fans on the bottom of
the unit both be running simultaneously in fault-free operation).
For all 3RW44 starters:
If it was not possible to reset the fault message by switching the control supply
voltage off and on again, contact your SIEMENS partner or create a support request
(see Chapter Support Request (Page 10)).
Heatsink sensor short-circuit The temperature sensor on the heatsink of the starter is not connected or defective.
Remedy: Contact your SIEMENS partner or create a support request (see Chapter
Support Request (Page 10)).
1) Possible ohmic value for a defective thyristor: <2 kOhm (L-T).
Note
In certain circumstances, some fault messages may be incorrect (e.g. phase failure L1
although L2 is missing).
Note
When using the 3RW44 soft starter in an IT system with ground fault monitoring: 3RW44,
product version ≤ *E06* and the PROFIBUS DP communication module must not be used in
this network configuration. 3RW44 soft starters from product version *E07* onwards can be
used in combination with the PROFIBUS DP communication module. However, the phase
voltage values (UL-N) and phase-to-phase voltage values (UL-L) may be displayed
incorrectly on the measured value display of the 3RW44.
Note
PROFINET communication modules can only be used with a product version of *E12* or
later.
Requirements
● You have configured an infeed module with integrated S7 station, e.g. with CPU315-2
DP.
● STEP 7 (V 5.1 or higher + hotfix 2) is fully installed on your PC or programming device.
● You are proficient in STEP 7.
NOTICE
NOTICE
NOTICE
For 3RW44 PROFIBUS DP communication module with product version < *E03*:
use of the 3RW44 with PROFIBUS on redundant controllers and Y-Link:
The 3RW44 acts like a DPV0 slave on Y-link. Parameter assignment is only possible via
the GSD file and only cyclic data is transmitted, no data sets or alarms.
For 3RW44 PROFIBUS DP communication module, product version *E04* or higher:
As from this version, DPV1 operation (read/write data sets and alarms) is also possible
downstream from a Y-link.
9.1.1 Definitions
S7 slave
An S7 slave is a slave that is fully integrated into STEP 7. It is embedded via OM Soft Starter
ES Professional. It supports the S7 model (diagnostic interrupts).
Writing data
Writing data means that data is transmitted to the soft starter.
Reading data
Reading data means that data is transmitted from the soft starter.
GSD
Device master data (GSD) contains DP slave descriptions in a standardized format. The use
of device master data simplifies the configuration of the DP master and the DP slave. See
Chapter Configuring with the GSD file (Page 173).
WARNING
Hazardous voltage!
Can cause electric shock and burns. Turn off and lock out all power supplying the system
and device before working on the device.
Read the information in the SIRIUS PROFIBUS communication module for 3RW44 soft
starter (https://support.industry.siemens.com/cs/ww/en/view/23071380) operating
instructions with the article number 3ZX1012-0RW44-0KA0.
NOTICE
Risk of property damage.
Before inserting the PROFIBUS DP communication module, disconnect the power to the
3RW44 soft starter.
Note
The PROFIBUS DP communication module can only be operated on 3RW44 devices with
product version "E06" or higher, implemented on devices from production date 060501
onwards.
Proceed as follows:
Step Description
Slide a small screwdriver into the
opening of the cover of the
3RW44 soft starter (1). Gently
press the screwdriver downwards
(2) and remove the cover (3).
9.4.1 Introduction
Activate the PROFIBUS DP communication module ("Fieldbus" device function) and set the
station address either via the display or the device interface using the "Soft Starter ES
Premium" or "Soft Starter ES + SP1" software.
Note
After the communication module has been activated, the default control priority automatically
switches from the inputs to the PROFIBUS DP communication module.
If an input with the "Manual mode local" function is active, the control priority does not
change (refer to chapter Parameterizing the inputs (Page 94)).
The soft starters are pre-set to station address 126 as the factory default.
9.4.2 Activating the PROFIBUS DP communication module via the display, setting
the station address and saving the settings
1. During first commissioning of the soft starter, you must run through the Quick Start menu
(refer to chapter Switching on for the first time (Page 55)). See also SIRIUS
3RW442/443/444/445/446 soft starter operating instructions
(https://support.industry.siemens.com/cs/ww/en/view/21189750) (article number:
3ZX1012-0RW44-0AA0).
2. Press the designated button on the device.
Note
If the "Parameters disabled CPU/Master" parameter is set to "Off" (factory setting), the
parameters set on the soft starter will be overwritten with the values stored in the GSD file
or in the OM when the bus is started. If this is not desired, the parameter must be set to
"On".
Note
If the "Parameters disabled CPU/Master" parameter is set to "Off" (factory setting) in the
"Fieldbus" menu, the parameters set on the soft starter will be overwritten with the values
stored in the GSD file or in the OM when the bus is started. If this is not desired, the
parameter must be set to "On".
8. Select "Device parameters > Fieldbus" on the left side of the window.
9. Select the "Load to switching device" icon in the toolbar.
Note
The soft starter only reads the station address automatically and saves it permanently
when the soft starter's supply voltage is activated (see chapter Flow diagram: PROFIBUS
DP starting the soft starter (Page 180)) or when the "Restart" command is issued.
9.5.1 Introduction
STEP 7
● The "Diagnose hardware" function is possible with STEP 7 V5.1, correction K5.1.2.0 or
higher.
● Reading back the configuration is not supported by STEP 7 (Target system → Load to
PG).
● Reading out diagnostics via the CPU 315-2 DP (with the "Diagnose hardware" function in
STEP 7) is not possible up to Article No. 6ES7315–2AF02.
NOTICE
Your configuration tool must support GSD files - Rev.3, for example STEP 7 V5.1+Service
Pack 2 and higher.
Note
Only the values for parameter set 1 (PS1) (and those that are independent of the parameter
set anyway, for example motor protection) can be set with the GSD file.
The default values are used for PS2 and PS3.
Diagnostics package
A free diagnostics package is available for 3RW44 soft starters. It contains HMI diagnostics
screens for a touch panel. The diagnostics package is available in English and German. You
can download the diagnostics package
(https://support.industry.siemens.com/cs/ww/en/view/28557893) from the Internet:
9.6.1 Introduction
The following example shows you how to commission the PROFIBUS DP communication
module.
● Installation and activation of the PROFIBUS DP communication module (fieldbus
interface)
● Configuration with STEP 7 using the GSD file
● Integration into the user program
● Switching on
Components needed
● 3RW44 soft starter
● 3RW49 00-0KC00 communication module
General requirements
● You have configured an infeed module with integrated S7 station,
● e. g. with CPU315-2 DP.
● You are proficient in STEP 7.
● The programming device is connected to the DP master.
Software requirements
Table 9- 3 Commissioning
Step Description
1 Activate the PROFIBUS DP communication module as described in chapter Activating the
PROFIBUS DP communication module (fieldbus interface) and setting the station address
(Page 166).
2 Set the required station address as described in chapter Activating the PROFIBUS DP
communication module (fieldbus interface) and setting the station address (Page 166).
3 Switch on the supply voltage for the DP master CPU 315-2 DP at the infeed module.
4 Observe the status LEDs of the DP master CPU 315-2 DP on the infeed module:
5 V DC: Lights up
SF DP: Off
BUSF: Flashing
5 Start the SIMATIC Manager and create a new project with a DP master
(e.g. CPU315-2 DP with DI 16 x DC 24 V and DO 16 x DC 24 V). Generate OB1 and
OB82 for the project.
Step Description
6 In HW Config, call up the Extras > Install new GSD file menu command, and integrate the
GSD file of the soft starter into the configuration tool of the DP master used. For the
CPU315-2 used in the example, you can optionally install
• the German GSD file SIEM80DE.GSG,
• the English GSD file SIEM80DE.GSE,
• the French GSD file SIEM80DE.GSF,
• the Spanish GSD file SIEM80DE.GSS,
• the Italian GSD file SIEM80DE.GSI
in the STEP 7 SIMATIC Manager.
7 Generate the PROFIBUS DP subnet.
8 Add the soft starter from the hardware catalog to the PROFIBUS under PROFIBUS DP >
Additional field devices > Switching devices > Motor starters > Direct soft starters >
SIRIUS 3RW44.
9 Set the station address for the soft starter to 3 (or higher).
10 Drag a module from the selection list of the drop-down menu to slot 1 of the SIRIUS
3RW44:
Note
During parameterization with the GSD file, it is possible to select values that are dependent
on each other, but are not permissible in combination. The respective parameter is reported
as an "Incorrect parameter value" in data set 92.
The following table shows which parameters are mutually dependent and how they must be
set:
Parameters Settings
Rated operational current Ie Depends on Tripping class CLASS (refer to chapter Technical
data of the power unit (Page 274))
Upper current limit Greater than Lower current limit, chapter Specifying current limit
values (Page 93)
Maximum starting time Greater than Starting time, chapter Specifying the startup mode
(Page 68)
Limiting torque Greater than Starting torque, chapter Specifying the startup
mode (Page 68), torque control and torque control
with current limiting.
Step Description
1 Create the user program in the LAD/STL/CSF editor in OB1.
Example: reading an input and controlling an output:
9.6.4 Switching on
Table 9- 6 Switching on
Step Description
1 Switch on the voltage supply for the soft starter.
2 Observe the status LEDs on the DP master CPU315-2 DP:
5 V DC: Lights up
SF DP: Off
BUSF: Off
3 Observe the status LEDs on the PROFIBUS module:
LED BUS: Lights up green
LED Description
BUS Red Bus fault
Red blinking Parameterization error
Red flickering Basic factory settings restored (red flickering
for 5 sec)
Red-green toggling*) Parameter error while starting S7
Green Device exchanging data
Yellow Device not initialized and bus error! (Send in
device!)
Yellow-green blinking Device not initialized and parameter error!
(Send in device!)
Off Device not exchanging data!
Specifications
Error: BF = bus fault
Frequency specifications: Blinking: 0.5 Hz
Flickering: 8 to 10 Hz
*) Toggling: 2 to 10 Hz
Assumptions
The following assumptions apply for this STEP 7 user program:
● Diagnostics address is 1022 (3FEH).
● Slave diagnostic data must be stored in DB82: from address 0.0,
length 32 bytes.
● The slave diagnostic data has a length of 32 bytes.
STL Explanation
CALL SFC 13
Note
The length of the diagnostics message frame varies between 13 and 32 bytes. The length of
the diagnostics message frame last received can be seen in STEP 7 from the RET_VAL
parameter of SFC 13.
Definition
The station status 1 to 3 provides an overview of the status of a DP slave.
Station status 2
Bit Meaning
0 1: The DP slave must be parameterized again.
1 1: A diagnostic message is pending. The DP slave will not work until the fault is rectified
(static diagnostic message).
2 1: The bit is always "1" when the DP slave with this station address is configured.
3 1: Response monitoring is enabled for this DP slave.
4 1: The DP slave has received the "FREEZE" control command. 1)
5 1: The DP slave has received the "SYNC" control command. 1)
6 0: Bit is always "0".
7 1: The DP slave is deactivated, i.e. it is decoupled from the current processing.
1) The bit is only updated if another diagnostics message also changes.
Station status 3
Bit Meaning
0 to 6 0: Bits are always "0".
7 1: • There are more diagnostics messages pending than the DP slave is able to store.
• The DP master cannot enter all the diagnostics messages sent by the DP slave in
its diagnostics buffer (channel-specific diagnostics).
9.9.6 Manufacturer ID
Definition
The manufacturer's ID contains a code specifying the DP slave type.
Definition
Identifier-related diagnostic data indicates whether soft starters are faulty or not. Identifier-
related diagnostics begins at byte 6 and is 2 bytes long.
ID-related diagnostics
Identifier-related diagnostics for soft starters is structured as follows:
Definition
The module status represents the status of the configured modules (in this case: soft
starters) and provides details of the identifier-related diagnostics. The module status starts
after the identifier-related diagnostics and consists of 5 bytes.
Definition
Channel-related diagnostics provides information about channel faults in modules (in this
case: soft starters) and provides details of the identifier-related diagnostics. Channel-related
diagnostics begins after the module status. The maximum length is limited by the maximum
total length of slave diagnostics amounting to 31 bytes. Channel-related diagnostics does not
affect the module status.
Up to 9 channel-related diagnostics messages are possible (see also station status 3, bit 7).
Channel-related diagnostics
Channel-related diagnostics is configured as follows:
Note
Channel-related diagnostics is always updated up to the current diagnostics message in the
diagnostics message frame. Subsequent, older diagnostics messages are not deleted.
Remedy: Evaluate the valid, current length of the diagnostics message frame:
• STEP 7 from the parameter RET_VAL of SFC 13.
Fault types
The diagnostics alarm is signaled on channel 0.
9.10.1 Properties
The soft starter evaluates a large amount of operating, diagnostic, and statistical data.
Control data
Data that is transferred to the soft starter, e.g. motor CCW switching command, trip reset,
etc.
Data format: Bit
Messages
Data that is transferred from the soft starter and indicates the current operating status, e.g.,
Motor CCW, etc.
Data format: Bit
Diagnostics
Data that is transferred from the soft starter and indicates the current operating status, e.g.,
Overload fault, etc.
Data format: Bit
Current values
Current values are coded in different current formats, namely in
● 6-bit current format,
● 8-bit current format, and
● 9-bit current format:
Description
If a data set is rejected, an error code is sent with the negative acknowledgment, both via the
device interface and via the bus interface. This provides information about the reason for the
negative acknowledgment.
The error codes comply with the PROFIBUS-DPV1 standard in as far as it applies to the soft
starter.
Error codes
The following error codes are generated by the soft starter:
Further information
You can find additional information about the SFBs
● in the reference manual "System Software for S7-300/400, System and Standard
Functions" (https://support.industry.siemens.com/cs/ww/en/view/1214574)
● in the STEP 7 online help
Byte arrangements
When data longer than one byte is stored, the bytes are arranged as follows ("big endian"):
Note
Note that data set 68 is overwritten by the cyclic process image in automatic mode!
Byte Meaning
Header
0 Writing coordination 0x20 via channel C1 (PLC)
Writing 0x30 via channel C2 (PC)
Writing 0x40 via device interface (PC)
1-3 Reserved = 0
Process image of the outputs
4 Process data DO-0.0 to DO-0.7, table below
5 Process data DO-1.0 to DO-1.7, table below
6 Reserved = 0
7 Reserved = 0
In the "Automatic mode", the PLC specifies the process image of the outputs. In this case,
reading of data set 68 at the local device interface returns the process image of the outputs
as transmitted by the PLC.
Byte Meaning
Process image of the inputs
0 Process data DI-0.0 to DI-0.7, table below
1 Process data DI-1.0 to DI-1.7, table below
2 Reserved = 0
3 Reserved = 0
This data set can accommodate 21 entries. When all locations have been written, the first
entry is overwritten again.
Note
The newest entry is entered at the end of the data set. The remaining entries are moved up
one entry.
This data set can accommodate 21 entries. When all locations have been written, the first
entry is overwritten again.
Note
The newest entry is entered at the end of the data set. The remaining entries are moved up
one entry.
This data set can accommodate 21 entries. When all locations have been written, the first
entry is overwritten again.
Note
The newest entry is entered at the end of the data set. The remaining entries are moved up
one entry.
9.12.6 Data set 81 - Reading the basic settings of data set 131
Data set 81 corresponds in structure and content to data set 131. Data set 81 supplies the
default values for all parameters of data set 131.
9.12.7 Data set 82 - Reading the basic settings of data set 132
Data set 82 corresponds in structure and content to data set 132. Data set 82 supplies the
default values for all parameters of data set 132.
9.12.8 Data set 83 - Reading the basic settings of data set 133
Data set 83 corresponds in structure and content to data set 133. Data set 83 supplies the
default values for all parameters of data set 133.
506 2 Phase current IL3 (%) 0 ... 797 % / [0 ... 255] 3.125%
507 3 Reserved = 0
501 4-5 Remaining motor cooling time 0 ... 1 800 s / [0 ... 18 000] 0.1 s
502 60-6 Motor heating 0 ... 200 % / [0 ... 100] 2%
67 Asymmetry ≥ 40% No asymmetry [0]
Asymmetry (≥ 40%) [1]
503 7 Asymmetry 0 ... 100 % / [0 ...100] 1%
8 Reserved = 0
10 Reserved = 0
11 Reserved = 0
12 - 13 Reserved = 0
14 Reserved = 0
508 16 Output frequency 0 ... 100 Hz / [0 ... 200] 0.5 Hz
17 Reserved = 0
18 Reserved = 0
19 Reserved = 0
509 20 Line frequency 0 ... 100 Hz / [0 ... 200] 0.5 Hz
21 Reserved = 0
510 22 - 23 Line-to-line voltage UL1-L2 (rms) 0 ... 1500 V / [0 ... 15000] 0.1 V
511 24 - 25 Line-to-line voltage UL2-L3 (rms) 0 ... 1500 V / [0 ... 15000] 0.1 V
512 26 - 27 Line-to-line voltage UL3-L1 (rms) 0 ... 1500 V / [0 ... 15000] 0.1 V
513 28 - 31 Phase current IL1 (rms) 0 ... 20000 A / [0 ... 2000000] 0.01 A
514 32 - 35 Phase current IL2 (rms) 0 ... 20000 A / [0 ... 2000000] 0.01 A
515 36 - 39 Phase current IL3 (rms) 0 ... 20000 A / [0 ... 2000000] 0.01 A
516 40 - 41 Electronics supply voltage 0 ... 1500 V / [0 ... 15000] 0.1 V
517 42 Heatsink temperature -40 ... 127 °C / [-40 ... 127] 1 °C
518 43 Contact block heating 0 ... 250 °C / [0 ... 250] 1 °C
519 44 - 45 Remaining cooling time of contact 0 ... 1800 s/ [0 ... 18000] 0.1 s
block
520 46 - 47 Remaining time for tripping of 0 ... 10000 s / [0 ... 10000] 1s
thermal motor model
521 48 - 51 Output power 0 ... 2147483 W / [0 ... 21474830] 0.1 W
522 52 - 63 Reserved = 0
658 6 Phase current IL3 min (%) 0 ... 797 % / [0 ... 255] 3.125%
7 Reserved = 0
653 8 Phase current IL1 max (%) 0 ... 797 % / [0 ... 255] 3.125%
654 9 Phase current IL2 max (%) 0 ... 797 % / [0 ... 255] 3.125%
655 10 Phase current IL3 max (%) 0 ... 797 % / [0 ... 255] 3.125%
11 Reserved = 0
652 12 Maximum tripping current IA max (%) 0 ... 1000 % / [0 ... 320] 3.125% Current during
switch-off due
to error
651 14 Number of motor overload trips 0 ... 65 535 / [0 ... 65 535] 1 Motor
protection,
temperature
sensor, stalling
659 16 Maximum tripping current IA max (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A Current during
switch-off due to
error
660 20 Phase current IL1 min (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A In bypass
661 24 Phase current IL2 min (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A operation
662 28 Phase current IL3 min (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A
663 32 Phase current IL1 max (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A
664 36 Phase current IL2 max (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A
665 40 Phase current IL3 max (rms) 0 ... 20 000 A / [0 ... 2 000 000] 0.01 A
666 44 Line-to-line voltage UL1 - L2min (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V Reset to 0 in the
667 46 Line-to-line voltage UL2 - L3min (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V event of phase
failure or
668 48 Line-to-line voltage UL3 - L1min (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V switch-off of
669 50 Line-to-line voltage UL1 - L2max (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V main voltage.
670 52 Line-to-line voltage UL2 - L3max (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V
671 54 Line-to-line voltage UL3 - L1max (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V
672 56 Electronics supply voltage 0 ... 1500 V / [0 ... 15 000] 0.1 V Reset to zero at
UNS min (rms) "Power on"
673 58 Electronics supply voltage UNS max (rms) 0 ... 1500 V / [0 ... 15 000] 0.1 V
674 60 Maximum heatsink temperature 1 ... -40 °C/ [-40 ... 127] 1 °C
675 61 Maximum contact block heating 0 ... 250 % / [0 ... 250] 1%
676 62 Minimum line frequency 0 ... 100 Hz / [0 ... 200] 0.5 Hz During line
failure or phase
failure = 0
677 63 Maximum line frequency 0 ... 100 Hz / [0 ... 200] 0.5 Hz
Table 9- 30 Data sets 131, 141, 151 - Technology parameters 2: Reading/writing sets 1, 2, 3
Dependencies
● Upper current limit > lower current limit
● DC braking can only be selected when the "DC braking contactor" function is assigned to
an output.
● Maximum starting time ≥ starting time
● Limiting torque > starting torque
Table 9- 31 Data sets 132, 142, 152 - Technology parameters 3: Reading/writing sets 1, 2, 3
Note
3RW44 soft starters signal the current baud rate while reading. During writing, the value
entered is ignored, as the baud rate is always automatically detected by the soft starter.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
10.1.2 3RW44 in a standard circuit with line contactor and control via PLC
Note
2) Risk of restart
The start command (e.g. issued by the PLC) must be reset when a group fault occurs,
because the motor attempts to restart again automatically if a start command is still active
following this reset command. This particularly applies to motor protection tripping.
For safety reasons, you are advised to integrate the group fault output (terminals 95 and 96)
in the controller.
10.1.3 3RW44 in a standard circuit and DC braking stopping function for device types
3RW44 22 to 3RW44 25
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
2) Risk of restart
The start command (e.g. issued by the PLC) must be reset prior to issuing a reset command,
because the motor attempts to restart again automatically if a start command is still active
following this reset command. This particularly applies if the motor protection has tripped.
For safety reasons, you are advised to integrate the group fault output (terminals 95 and 96)
in the controller.
3) Ifthe "combined braking" stopping function is selected, a braking contactor is not required.
A braking contactor must be additionally used if the "DC braking" function is selected.
◆For types, refer to the "Feeder component layout (standard circuit)" table in chapter Feeder
component layout (standard circuit) (Page 286).
The "DC braking" function is recommended for applications with larger centrifugal masses
(Jload > Jmotor).
Output 2 must be set to "DC braking contactor".
10.1.4 3RW44 in a standard circuit and DC braking stopping function for device types
3RW44 26 to 3RW44 66
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
2) Risk of restart
The start command (e.g. issued by the PLC) must be reset prior to issuing a reset command,
because the motor attempts to restart again automatically if a start command is still active
following this reset command. This particularly applies if the motor protection has tripped.
For safety reasons, you are advised to integrate the group fault output (terminals 95 and 96)
in the controller.
3) Ifthe "combined braking" stopping function is selected, a braking contactor is not required.
A braking contactor must be additionally used if the "DC braking" function is selected. For
types, refer to the "Feeder component layout (standard circuit)" table in chapter Feeder
component layout (standard circuit) (Page 286).
The "DC braking" function is recommended for applications with larger centrifugal masses
(Jload > Jmotor).
Output 2 must be set to "DC braking contactor".
Auxiliary relay K4, e.g.:
4)
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
Please note the wiring suggestions for the inside-delta circuit on the main circuit side.
Incorrect connection can result in faults.
Note
Risk of restart
The start command (e.g. issued by the PLC) must be reset prior to issuing a reset command,
because the motor attempts to restart again automatically if a start command is still active
following this reset command. This particularly applies if the motor protection has tripped.
For safety reasons, you are advised to integrate the group fault output (terminals 95 and 96)
in the controller.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
With this circuit type, motor starting may be delayed by up to 5 s after the start command,
due to the internal run times of the soft starter. Coasting down is the only possible coasting
method.
Note
After the control supply voltage has been switched off and before restarting, the device must
be allowed to cool down for at least 30 s, as this influences the effectiveness of the inherent
protection of the soft starter.
This type of circuit is not recommended for higher switching frequencies as the integrated
fan cannot idle after the soft starter has been switched off, thus reducing the switching
frequency specified in the technical data.
10.1.7 3RW44 in a standard circuit with soft start/stop and additional slow speed
function in both directions of rotation with one parameter set
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
Parameter assignment
Set the control input functions to::
IN1: Motor CW PS1
IN2: Motor CCW PS1
IN3: Slow-speed mode
IN4: Trip/reset (factory default)
The slow-speed parameters in parameter set 1 must be set. Motor CW means rotation in line
phase direction, motor CCW means rotation against the line phase direction.
Note
The slow-speed function is not suitable for continuous operation. The motor can heat up to
an inadmissible extent during continuous operation at slow speed.
Note
Risk of restart
The start command must be reset prior to issuing a reset command, because the motor
attempts to restart again automatically if a start command is still active following this reset
command. This particularly applies if the motor protection has tripped.
K1, K2, K3 = relays for contact multiplication, e.g. for 230 V AC operation: 3RS 1800-1BP00
10.1.8 Control via @PROFIBUS with switchover to manual local operation (e.g. on the
control cabinet)
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
10.1.9 3RW44 in a standard circuit and reversing operation via main contactors with
one parameter set without soft stopping
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
The "Coasting down" coasting method must be set on the 3RW44.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
10.1.11 Soft starter for pole-changing motor with separate windings and 2 parameter
sets
1)For permissible main and control voltage values, refer to chapter Technical data
(Page 268).
Note
The "Coasting down" coasting method must be set on the 3RW44.
1) For permissible main and control voltage values, refer to chapter Technical data of the power unit (Page 274).
Note
The "Coasting down" coasting method must be set on the 3RW44.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
The rated output of the 3RW44 to be configured must be at least as high as the sum of the
motor's rated outputs.
The loads should have similar mass moments of inertia and torque curves.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
The rated output of the 3RW44 to be configured must be at least as high as the sum of the
motor's rated outputs.
The loads should have similar mass moments of inertia and torque curves.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
The "Coasting down" coasting method must be set on the 3RW44.
Note
In the case of increased operating sequences, the 3RW44 should be dimensioned at least
one capacity level higher than the highest connected motor output.
10.1.15 Soft starter for serial starting with 3 parameter sets (deactivate soft stop and
3RW44 motor protection)
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Note
In the case of increased operating sequences, the 3RW44 should be dimensioned at least
one capacity level higher than the highest connected motor output.
Note
The "Coasting down" coasting method must be set on the 3RW44.
10.1.16 Soft starter for activation of a motor with a magnetic fixing brake
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
10.1.17 Safe disconnection according to IEC 62061 (SIL) and/or ISO 13849-1 (PL)
The 3RW soft starter is used for functional switching. Safe disconnection can also be
realized, for example, with a 3SK1 safety relay and power contactors.
The examples given in the FAQ
(https://support.industry.siemens.com/cs/ww/en/view/67474130) describe possible
configurations based on various safety requirements.
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
10.1.19 Soft starter with star-delta starter as emergency start (3RW44 in a standard
circuit)
1) For permissible main and control voltage values, refer to chapter Technical data of the power unit (Page 274).
1)For permissible main and control voltage values, refer to chapter Technical data of the
power unit (Page 274).
Menu: Statistics
Logbooks Device fault
Trips
Events
Maximum pointer Currents (%) Phase current L1 min
Phase current L2 min
Phase current L3 min
Phase current L1 max
Phase current L2 max
Phase current L3 max
Currents (rms) Phase current L1 min
Phase current L2 min
Phase current L3 min
Phase current L1 max
Phase current L2 max
Phase current L3 max
Line-to-line voltages UL1 - L2 min (rms)
UL2 - L3 min (rms)
UL3 - L1 min (rms)
UL1 - L2 max (rms)
UL2 - L3 max (rms)
UL3 - L1 max (rms)
Maximum operating current IA (%)
Maximum operating current IA (rms)
Number of overload trips
Minimum line frequency
Maximum line frequency
Max. heat sink temperature
Max. contact block heating
Reset maximum pointer
Menu: Statistics
Statistical data Motor current Imax (%)
Motor current Imax (rms)
Last tripping current IA (%)
Last tripping current IA (rms)
Operating hours - device
Operating hours - motor
Number of starts motor CW
Number of starts motor CCW
Number of overload trips
Number of stops with electrical braking
Number of starts output 1
Number of starts output 2
Number of starts output 3
Number of starts output 4
Menu: Safety
Factory settings Customer settings
Enter user code 1000
User level Customer read only (> 1000)
Customer write (1000)
Table 11- 1 Normal starting (CLASS 10) in inline circuit - Part 1/3
Table 11- 2 Normal starting (CLASS 10) in inline circuit - Part 2/3
Table 11- 3 Normal starting (CLASS 10) in inline circuit - Part 3/3
Table 11- 4 Normal starting (CLASS 10) in inside-delta circuit - Part 1/2
Table 11- 5 Normal starting (CLASS 10) in inside-delta circuit - Part 2/2
The listed motor ratings are only approximate values. The soft starter should always be
designed on the basis of the motor current (rated operational current). A larger model may
need to be selected for different conditions.
Motor output ratings are based on DIN 42973 (kW) and NEC 96/UL508 (hp).
Types of coordination
The DIN EN 60947-4-1 (VDE 0660 Part 102) or IEC 60947-4-1 standard distinguishes
between two types of coordination, referred to as coordination type "1" and coordination type
"2". The short circuit that needs to be dealt with is cleared reliably and safely with both types
of coordination; the only differences are in the extent of the damage sustained by the device
following a short circuit.
The fuseless load feeder may be non-operational after a There must be no damage to the overload release or to any
short circuit has been cleared. Damage to the contactor or other components after a short circuit has been cleared. The
to the overload release is permissible. For 3RA1 load 3RA1 fuseless load feeder can resume operation without
feeders, the circuit breaker itself always achieves type 2 needing to be renewed. At most, welding of the contactor
coordination. contacts is permissible if they can be disconnected easily
without any significant deformation.
Fuse assignment
The type of coordination according to which the motor feeder with soft starter is mounted
depends on the application-specific requirements. Normally, fuseless mounting (combination
of motor starter protector and soft starter) is sufficient. If type of coordination 2 is to be
fulfilled, semiconductor fuses must be fitted in the motor feeder.
Note
If the F3 semiconductor fuse is not used, the type of coordination "2" is reduced to type of
coordination "1" for soft starters in combination with the stipulated protective device.
11.3.8 Accessories
• PROFINET 3RW4900-0NC00
3RW4900-0KC00
3RW4900-0NC00
Note
3RW4422 and 3RW4423
The 3RW4422 and 3RW4423 soft starters do not need fans. These devices are adequately
designed for natural convection.
3RW44 5 3RW44 6
a 76 mm (3 in) 85 mm (3.35 in)
b 40 mm (1.6 in) 50 mm (1.97 in)
c 14 mm (0.6 in) 14 mm (0.6 in)
d 20 mm (0.8 in) -
e 15.5 mm (0.7 in) -
f 638.5 mm (25.2 in) 667 mm (26.3 in)
g 590 mm (9.45 in) 660 mm (26 in)
h - 160 mm (6.3 in)
i 44 mm (1.8 in) 37.5 mm (1.48 in)
k 470mm (18 in) 535 mm (21 in)
l 510 mm (20 in) 576 mm (22.7 in)
m 16.5 mm (0.7 in) 16.5 mm (0.7 in)
n 105 mm (4.1 in) 103 mm (4.06 in)
o 253 mm (10 in) 251 mm (9.88 in)
p 623 mm (24.6 in) 693 mm (27.3 in)
q - 43.5 mm (1.71 in)
r - 40 mm (1.6 in)
s - 20 mm (0.78 in)
t 249 mm (9.8 in) 249 mm (9.8 in)
u 162 mm (6.4 in) 162 mm (6.4 in)
v 152 mm (5.9 in) 151.4 mm (5.96 in)
w - 123 mm (4.84 in)
ad 290 mm 290 mm
Weight 50.0 kg 78.0 kg
3RW44 5 3RW44 6
x 290 mm (11.4 in) 289.5 mm (11.4 in)
y 147 mm (5.7 in) 175 mm (6.9 in)
z 173 mm (6.9 in) 173 mm (6.8 in)
aa 195 mm (7.7 in) -
ab 118 mm (4.6 in) 118 mm (4.65 in)
ac 261 mm (10.2 in) 261 mm (10.28 in)
ad 290 mm (11.5 in) 290 mm (11.42 in)
Siemens motor?
Rated power: kW
Rated voltage: V
Line frequency: Hz
Rated current: A
Starting current: A
Rated speed: rpm
Rated torque: Nm
Breakdown torque: Nm
Mass moment of inertia: kg*m2
nM 1/m "nsyn"
MM %
nM 1/m "nsyn"
IM %
2. Load data
nL 1/m "nsyn"
ML %
3. Start conditions
Yes Value
Starting current limitation? ❑ ...............
Acceleration torque limitation? ❑ ...............
Maximum starting time? ❑ ...............
4. Personal details
Last name, first name:..........................................................................................................
Company: ............................................................................................................................
Department: ........................................................................................................................
Street: .................................................................................................................................
Zip code, town/city: .............................................................................................................
Country: ..............................................................................................................................
Phone: ................................................................................................................................
Fax: .....................................................................................................................................
E-mail: .................................................................................................................................
A F
Ambient temperature, 27 Factory settings, 28
Application examples, 22
Applications, 19, 125, 130
Asymmetry, 144 G
Asymmetry limit value, 144
Ground fault, 154
GSD file, 173
B
Breakaway pulse, 130 I
Breakaway time, 131
Idle time, 145, 145
Breakaway voltage, 130
Inchnig, 145
Byte arrangements, 198
Installation altitude, 27
Internal run-up recognition, 127, 129
Intrinsic device protection, 147
C
Capacitor, 43
CLASS 10, 22, 145 L
CLASS 10A, 145
Limiting torque, 128
CLASS setting, 143, 145, 155
Locked-rotor torque, 15, 126, 128, 130
Coast-down time, 136, 139, 140, 140
Coasting down, 136
Coasting methods, 135
M
Combined braking, 139
Configuration, 21 Maximum pointer, 195
Configuring with GSD, 173 Maximum starting time, 126
Contact element, 34 Messages, 149
Control voltage versions, 44 Motor heating, 134, 144
Current asymmetry limit value, 144 Motor overload protection, 143
Current limiting, 133 Motor protection function, 143
Current limiting value, 132
Current limits, 143
O
ON time motor, 26
D
Overtemperature, 154
Data sets, 198
DC braking, 138, 140
DC braking torque, 139, 140 P
Degree of protection, 32
Parameter sets, 125
Diagnostics, 149
PC Interface, 21
Disconnector, 34
Phase failure, 151
Dynamic braking torque, 139
PLC, 34, 155, 155, 195, 199, 199, 208
Prewarning limit, 144
Profibus, 51
PROFIBUS DP communication V
module, 151, 152, 157, 160, 160, 164, 165, 166, 168,
Very heavy starting, 25
171, 175, 176, 176
Voltage ramp, 126, 128
Protection against voltage failure, 146
PTC thermistors, 146
Pump stop, 136, 137
W
Water hammer, 137
R
Ramp-up detection, 133, 134
Rated speed, 141
Reduced starting current, 15
Run-up recognition, 127, 129
S
Screw connections, 44
See display for details of the operating and monitoring
module, 21
See operating and monitoring module for details of the
display, 21
Selection criteria, 19
Semiconductor fuse, 41, 147
SITOR, 41, 147
SITOR fuses, 41
SITOR semiconductor fuse, 147
Size
3RW44 2., 44
3RW44 3., 45
3RW44 4., 45
Slow speed factor, 141
Slow speed torque, 141
Software, 21, 51
Spring-loaded connections, 44
Starting current, 14
Starting time, 126, 129
Starting torque, 128
Starting voltage, 126
Startup, 18, 19
Startup class, 22
Stopping torque, 136
Supply voltage, 152
Switching frequency, 26
T
Temperature sensor, 146
Thermoclick sensors, 146
Three-phase asynchronous motors, 144
Torque control, 128
Tripping class, 143, 144