Floating Shaft Monitor Manual 1
Floating Shaft Monitor Manual 1
Floating Shaft Monitor Manual 1
Zelgli 20
8905 Arni info@tomtom-tools.com
Switzerland www.tomtom-tools.com
User Manual
Version January 1, 2022
1 INTRODUCTION
Fig. 1.0.1 Controller
The Floating Shaft Monitor is used to measure and analyze the axial
movement of the floating shaft in a gearbox with torque split function.
It reveals dangerous shock peaks on the gears.
For example: Flender DMG2 (Combiflex), FLS Maag LGD, CMD
Millrex and Wikov Side Drive are designed to drive ball mills via a
girth gear. These gearboxes are equipped with a floating shaft, which
is dividing the torque evenly to the two output pinions, by its axial
movement. Disturbances as radial runout on the girth gear or pitch
errors at the splits of the girth gear can cause excessive axial
movement which is harmful for the gears. Therefore, it is
recommended to monitor the movement of the floating shaft.
Not only the value of the movement is important; but also, the axial
speed or acceleration. A smooth slow sinusoidal movement by each
turn of the mill is indicating eccentricity of the girth gear. Abrupt
changes in axial position are indicating dangerous shock peaks
caused by roundness or pitch problems in the girth gear.
Beside the traditional vibration
analysis, the monitoring of the
movement of the floating shaft
brings a great visibility about the
condition of the drive train. This
simple method is also known by the
manufacturer of these type of
gearboxes, nevertheless usually the
signals are not analyzed in a way to
get the full benefit out of them.
2 SAFETY
Ball Mills, where this system typically is used, are huge rotating equipment with many pinch
points which can cause serious injuries. Therefore, only specialized and trained personnel
shall work close to these machines. For installation, follow strictly the local safety rules given
by the respective plant / factory / local authorities and discuss the application with the safety
engineer in charge.
The tools provided by TomTom-Tools GmbH have proven their functionality in various
applications; nevertheless TomTom-Tools GmbH does not take any responsibility for the
application on site regarding safety or machine damage. The plant is responsible for the
safety, according to the local law, in a way that nobody can be hurt or injured. The
application and safety instructions below are guidelines and not exhausted which include the
experience from previous installations. They might need to be adapted to the local
circumstances and safety requirements.
Caution:
Pinch Points:
Do not put your hands nor any items close or into pinch points.
(e.g. tooth wheels, couplings …)
Keep safe distance to avoid getting caught by moving parts
(e.g. bolts on mill shell)
Install the sensors only when the equipment is stopped. Place the
Reference Sensor out of reach, out of normal access
Magnetic Fields:
The magnets attached to some of the components are strong.
Be aware of the strong magnetic fields.
Keep the tool away from people with pace makers or any other sensitive
item as credit cards or magnetic data carrier.
Hot Surfaces:
The mill and some components might be hot.
Do not touch it and keep safe distance.
Fire:
Take care about the risk of fire during the installation of the sensors.
Special precautionary measures are required while performing hot work
close to inflammable materials e.g. lubricants
Gloves:
Wear proper gloves to protect your hands from hot and rough surfaces
and sharp edges.
TABLE OF CONTENT
1 INTRODUCTION ............................................................................................................ 1
2 SAFETY ......................................................................................................................... 2
3 FEATURES: ................................................................................................................... 3
4 TYPICAL SETUP ........................................................................................................... 4
5 INSTALLATION.............................................................................................................. 5
5.1 Floating Shaft Sensor .............................................................................................. 5
5.2 Floating Shaft Controller .......................................................................................... 6
6 WIRING.......................................................................................................................... 7
6.1 Pin Assignment ....................................................................................................... 7
6.2 Power Supply .......................................................................................................... 8
6.3 Floating Shaft Measurement ................................................................................... 8
6.4 Signal Output .......................................................................................................... 9
7 CONFIGURATION ........................................................................................................10
7.1 Adjustment of Output Range ..................................................................................11
7.2 Sensor Linearization...............................................................................................11
7.3 Time Window .........................................................................................................11
8 DRAWINGS ..................................................................................................................12
8.1 Controller Floating Shaft Monitor ............................................................................12
8.2 Floating Shaft Sensor .............................................................................................12
3 FEATURES:
• Output 1: Axial movement of floating shaft, Amplitude value in mm
• Output 2 (Option a): Maximal axial speed of floating shaft in mm/s
• Output 2 (Option b): Maximal axial acceleration of floating shaft in mm/s2
• Indicates if the sensor is getting out of range
• Very stable results
• Does not require high sampling rate of the plant control system
4 TYPICAL SETUP
Fig. 4.0.1
Upper Output Pinion Girth Gear
Floating
Shaft (blue)
Input Shaft
5 INSTALLATION
The installation and commissioning of the system is easy and quick. The sensor comes with
a special fitting to facilitate the installation and the cables are ready-made with water and
dust tight M12 connectors.
Most gearboxes are already equipped with the threaded hole to accommodate the Floating
Shaft Sensor. To install the sensor, follow the following steps:
a) Remove the tap on the cover of the floating shaft and mount the Sensor Fitting.
Use the tap which is slightly out of the center.
Do not use the center tap, because the floating shaft has usually a center bore which is
not a good surface to measure.
b) Place the seal ring (USIT: UR 26.7X35X2.0) on the outer G3/4” tread of the Sensor
Fitting
d) Insert the sensor carefully through the fitting and push it in until it touches the floating
shaft
e) Pull it back by about 4…5mm to be approximately in the middle of the sensor range
Fig. 5.1.1. Adapter Fitting Fig. 5.1.2. Location for sensor installation
Inductive Sensor
Ø18mm Seal Ring USIT M12 Connector
UR 26.7X35X2.0 (male, A-coded, 4 pin)
Fig. 5.1.3 Visualization of gear set with floating shaft and sensor
Floating Shaft
Floating Shaft Sensor
The controller is water and dust tight, and made to be placed close to the mill drive.
Nevertheless, make sure it is not exposed to high vibration, heat and sunlight.
Install the heat shield cover if needed.
For quick installation the controller can be attached by strong magnets e.g. to the gearbox, to
a steel structure or to a pole near the mill.
For bolting, use four M5 Allen bolts, going through the housing.
As an option, it is also possible to mount the controller into the electrical cabinet of the mill,
together with the power source and the I/Os from the plant control system.
Mounting Plate
CCT.01.005
(optional)
6 WIRING
The controller is pre-wired from the terminal blocks on the circuit board to the M12
connectors in the housing.
The numbering and color coding are in accordance with IEC 61076-2-101.
All M12 connectors and cables in use are A-coded.
Fig. 6.0.1: Back side of the circuit board in the Floating Shaft Monitor
UP 0 DOWN
1
3
Sensor (Input) 2
Floating Shaft
BN 1
WH 2
BU 3
Power Supply
Signal Output
5 GY
-3 BU
2 WH
+1 BN
12…30VDC
C A
Only one single 24VDC (0.2A) power source is required for the Floating Shaft Monitor.
It is usually accommodated in the cabinet with the analog input connections to the control
system of the plant.
The axial shaft position is measured by an inductive distance sensor. It provides an analog
signal (4…20mA) on pin 2 (white wire) which represents the distance to the shaft end. The
sensor has to be connected to the controller via Connector C, as shown in Fig. 4.0.2.
The sensor IG6083 has a range of 1…8mm (4…20mA). Therefore, it should be installed with
approximately 4…5mm distance from the roller surface to be in the middle of its range. If the
sensor distance reaches the end of the range, the message “dist” will be displayed.
0.4
The axial movement is provided by the controller as an analog output signal of 4…20mA on
the terminal block and connector A, Pin 2, white wire.
1 2.3
The axial velocity is provided by the controller as an analog output signal of 4…20mA on the
terminal block and connector A, Pin 5, grey wire. The ratio depends on the value which is
configured. The different options are explained later in the chapter 7.2.
A1.5 6
The axial acceleration is now provided by the controller in the same way as the velocity
explained before. The analog output signal of 4…20mA goes to the connector A, Pin 5, grey
wire. The ratio depends also on the value which is configured. The different options are
explained later in the chapter 7.2.
7 CONFIGURATION
The Floating Shaft Monitor works already with the default settings and shows the values of
the axial as soon as the mill is rotating. To bring the analog output signal into the proper
working range and to adapt the system to an existing sensor, the controller can easily be
configured. It is done by using the rotary switch to select the parameter and the UP and
DOWN button to change the values.
Fig. 7.0.1:
Configuration Switch and Buttons
UP DOWN
0
1
3
As mentioned in the chapter 6.4, the analog output can be adjusted to the expected velocity
or acceleration of the floating shaft. These values can be quite different, depending on the
gearbox design. Different manufacturer chose different helix angles on the gears which result
in a different behavior of the floating shaft. To adjust the output to the range of velocity or
acceleration, perform the following steps:
1. Open the controller to get access to the circuit board
2. Turn the rotary switch to position 1
3. Push the UP or DOWN button to select the required range.
The following parameters are available: 0.25, 0.50, 1.00*, 2.00
they represent: [mm/s/mA] in the velocity mode
[m/s2/mA] in the acceleration mode
At the right side of the display indicates a letter in what mode the controller is measuring.
• “V” stands for the velocity mode* (the output signal will be in mm/s)
• “A” stands for the acceleration mode (the output signal will be in m/s2)
Note:
The mode is changed by pushing the UP or DOWN button when the end of the possible
parameter is reached.
V1.0 0 A 0.5 0
8 DRAWINGS
8.1 Controller Floating Shaft Monitor