Pulsafeeder Cooling Tower Controler Microtrac Iom
Pulsafeeder Cooling Tower Controler Microtrac Iom
Pulsafeeder Cooling Tower Controler Microtrac Iom
MICROPROCESSOR – BASED
WATER TREATMENT
CONTROLLER
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MICROtrac Warranty
Pulsafeeder, Inc. warrants MICROtrac control systems (including the conductivity sensor) of its
manufacture to be free of defects in material or workmanship. Liability under this policy extends for 24
months from date of shipment. The manufacturer's liability is limited to repair or replacement of any
failed equipment or part, which is proven defective in material or workmanship upon completion of the
manufacturer's examination. This warranty does not include removal or installation costs and in no event
shall the manufacturer's liability exceed the selling price of such equipment or part.
The manufacturer disclaims all liability for damage to its products through improper installation,
maintenance, use, or attempts to operate such products beyond their functional capacity, intentionally or
otherwise, or any unauthorized repair. The manufacturer is not responsible for consequential or other
damages, injuries, or expense incurred through the use of its products.
The above warranty is in lieu of any other warranty, whether expressed or implied. The manufacturer
makes no warranty of fitness or merchantability. No agent of ours is authorized to provide any warranty
other than the above.
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Table of Contents
1. INTRODUCTION ........................................................................................ 4
2. INSTALLATION.......................................................................................... 4
2.1 Controller Location ......................................................................... 4
2.2 Sensor Installation .......................................................................... 4
3. ELECTRICAL WIRING ................................................................................ 6
3.1 Electrical Connections .................................................................... 6
4. SYSTEM OPERATION ................................................................................ 9
4.1 Front Panel ..................................................................................... 9
4.2 System Functions ........................................................................... 10
4.3 Controller Programming ................................................................. 11
4.3.1 Control Modes ........................................................................... 11
4.3.2 Conductivity Set Point ............................................................... 13
4.4 Alarm Conditions ............................................................................ 13
5. SENSOR CALIBRATION ............................................................................. 14
6. FACTORY DEFAULT VALUES ..................................................................... 14
7. SPECIFICATIONS ...................................................................................... 15
8. TROUBLE SHOOTING GUIDE ..................................................................... 16
9. CONTROLLER MOUNTING DIMENSIONS ...................................................... 18
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1. Introduction
Your microprocessor-based controller has been designed to monitor and control the conductivity of your
process water. The controller energizes two relay outputs based on a bleed and feed mode of operation.
- When the conductivity measurement goes above the user defined set point, (2) two relays are
energized until the conductivity goes below the set point minus the fixed differential value.
The feed relay will also de-energize when the user programmable feed limit time is
reached.
- Optional - The feed control relay will energize based on a percentage of a 10 minute feed cycle.
Your controller may or may not have the following optional configurations:
Pigtails (pre-wired)
The controller is pre-wired with a power cord and drop down receptacles for plugging in control
devices such as a solenoid valve or a metering pump.
Flow Switch
The controller is supplied with a flow switch that is installed into the process flow line to signal
the controller that your system has water flowing. When there is a no flow state, the controller
will not energize the outputs.
2. Installation
2.1 Controller Location
Select a mounting location convenient to grounded electrical and plumbing connections. Mount the
controller on a wall or other vertical surface with adequate lighting at a comfortable level. Remove
the four screws that retain the front panel and remove it, mounting passages are located in each of
the four corners in the back of the enclosure (See page 15). Installation should comply with all
national, state and local codes.
Avoid locations where the controller would be subjected to extreme cold or heat
{less than 0°F (-17,8°C) or greater than 122°F (50°C)}, direct sunlight, vibration,
vapors, liquid spills or EMI (electromagnetic interference; e.g., strong radio
transmission and electric motors). The controller could be damaged and void the
warranty!
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Typical Installation
Fig. 1
Probe Alignment
Fig. 2
For maximum accuracy, make sure that the conductivity sensor is installed so
the liquid stream passes straight through the round probe hole (see Fig.2).
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Flow Sensor
If your controller is provided with a flow switch, install the flow switch so that flow enters into the
bottom of the provided flow switch tee, and out of the side of the tee. The flow switch must always
be installed in a vertical position so that the sensor wire is coming out of the top, and the internal
(red) flow shuttle is able to rise when there is flow and drop when there is not flow. The flow switch
is activated when 1 GPM (3.8 LPM) is going through it, and is deactivated when the flow drops
below 1 GPM (3.8 LPM).
3. Electrical Wiring
The controller electronic circuitry is fuse protected. Use of a surge protector is strongly
recommended!
The controller should be connected to a dedicated power branch (i.e., its own
wiring, circuit breaker, etc.). For best results, the ground should be independent
(true earth) not shared.
Pre-wired controllers are supplied with 6 ft (1,8 m), 18 AWG (1,2 mm2) 3-wire grounded power
cords and clearly marked 18 AWG (1,2 mm2) 3-wire grounded receptacle cords for all controlled
line voltage outputs.
Controllers that are to use electrical conduit are factory pre-drilled with easily accessible connections
for hard wiring of input and output power connections. Use only 16 AWG (1,5 mm2) or 18 AWG
(1,2 mm2) wire for conduit power and load connections.
Supply power
The controllers supply power is identified on the main PC board as location PL3 (refer to
Fig. 3 on page 8). There are three connections identified on the board for this terminal block,
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HOT (LINE), RTN (return or Neutral), and Ground. On some models, a power cord without
a plug is provided.
If your controller is not equipped with a flow switch, there should be a jumper
wire installed across PL2. (See Fig.3)
The controller is fused at 5 amps maximum. Both output devices combined can
not exceed 5 amps of current.
Conductivity probe
The controller is supplied with one temperature compensated conductivity sensor. The
sensor connects to PL1 of the controller PC board. Match the wire color from the probe with
the text next to connector PL1.
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PUMP
(3-WIRE)
HOT
(NORMALLY OPEN)
CONDUCTIVITY
(EARTH / CHASSIS GROUND)
RET SENSOR
(RETURN/NEUTRAL)
RET HOT DIP BLACK
5A
F1
DOSE PL4 BROWN
SWITCH ORANGE
RED
FUSES PL1
RET HOT
SUPPLY PL3 ON DIP
5A
F2
SW1 1 2 3 4
no HOT
nc HOT
RET
(4-WIRE) PL2
PL5
COM
WATER
FLOW
COM
METER
(RETURN / NEUTRAL) BLEED
RET
(NORMALLY / OPEN)
(NORMALLY / CLOSED)
TOROIDAL
SUPPLY PROBE
POWER CONTACT
METER
FLOW
SWITCH
Wire Connections
Fig. 3
These connections are made using a green terminal block that uses screws to retain a wire inserted
into the square openings as seen below. Using a small flat head screwdriver, loosen the screw
enough to allow clearance for the wire, then insert the wire and tighten the screw securely.
Terminal Block
Fig. 4
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4. System Operation
BEFORE APPLYING POWER, INSURE THAT DEVICES BEING CONTROLLED BY THIS
CONTROLLER ARE NOT IN A POSITION TO CAUSE HARM OR DAMAGE IF ENERGIZED UPON
INITIAL START-UP.
DISPLAY
SCREEN
Bleed
uS
Set Point
m
Feed
MICROtrac
Front panel
Fig. 5
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4.2 System Functions
Bleed The bleed LED will light when the bleed relay is energized in normal
operation or when the controller is displaying the bleed limit time setting.
When in programming mode this LED will flash indicating it is okay to
change the bleed limit time setting.
uS The uS LED will light when the controller is displaying the system
conductivity reading. The controller displays this during normal operation or
when there has been no button activity for 30 seconds. When calibrating the
probe this LED will flash indicating it is okay to change the probe
conductivity value.
Set Point The set point LED will light when the controller is displaying the
conductivity set point. The set point is the conductivity value that will
energize the Bleed and Dose relays. When in programming mode this LED
will flash indicating it is okay to change the set point setting.
Feed This LED will light when the “Dose” or feed relay is energized. When in
programming mode this LED will flash indicating it is okay to change the
feed limit time setting.
Mode Selection
The controller’s mode of operation is selected by the switch settings of SW1
located on the PC board, see Fig. 3.
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4.3 Controller Programming
Press the Mode button to advance to the setting to be changed indicated by the function’s LED. To
enter programming mode press and hold the Mode [m] button for five seconds. The function’s LED
will begin to flash when the programming mode has been activated. Use the [Up]/[Down] buttons to
modify the programmable parameters.
• Limit Timer - This control mode causes the Bleed and Feed output to energize when the
conductivity exceeds the Conductivity setpoint. The Bleed and Feed limit timers
can be activated to prevent over-feeding of chemicals.
• Water Meter – This control mode causes the Feed output to energize when a programmed
number of pulses are detected on the water meter input terminal.
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before the Bleed output energizes.
Feed Counts Counts – Set this value to the number of water meter input pulses needed
+ Time before the Feed cycle begins. Range = 1-9,999.
Time – Set this value to the amount of time the Feed output should energize
when the programmed number of water meter input pulses have been
detected. Range = 0-59:55, MM:SS. The time value is adjusted in 5 second
increments.
• % Post Bleed – This control mode causes the Feed output to energize following a Bleed
cycle. The amount of time the Feed output stays energized is based on the
programmed percentage of the prior Bleed cycle.
• Percent Timer – This control mode causes the Feed output to energize based on a
percentage of a fixed time cycle. The cycle time is base on a fixed 10-minute
cycle. Once the 10-minute cycle completes the cycle will be restarted again.
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4.3.2 Conductivity Set Point
Set this value to the highest conductivity point the controller will allow before a bleed and feed
cycle begins. When the system conductivity reaches this set point the bleed and feed control
outputs will energize. When the system conductivity falls to the conductivity set point minus 5%
the bleed and feed cycle will terminate and the control outputs will de-energize.
The Conductivity Set Point can be changed with the [Up]/[Down] buttons once in programming
mode. The maximum setting is 9999 uS/cm. To save the set point press the Mode [m] button.
The set point differential is fixed at 5% below the set point. For example,
if the set point is set to 1000uS/cm the bleed and feed outputs will energize at
1000uS/cm and de-energize at 950uS/cm.
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Both Limit Timers will reset if the conductivity reading changes to above or below
the set point and differential.
5. Sensor Calibration
The controller is factory calibrated and requires no user adjustments. Some deviation in the reading
may be expected when compared to a hand-held tester. However, if you wish to perform a
calibration, follow this procedure:
1. Place the probe in the process that it will normally be installed in and allow flow across the
probe for approximately 15 minutes. This will allow the probe temperature to equalize.
2. While the “uS” LED is steady press and hold the “m” mode button for five seconds until the
controller flashes “Cal”. Release the “m” button.
3. The controller will now display the actual conductivity reading from the probe. Use the up
and down buttons to change the reading until it matches your hand-held’s reading. If you
press and hold the up or down buttons, the displayed value will change very quickly.
IMPORTANT! For optimum performance, make sure that the system conductivity is near
the set point that you intend to operate the system.
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7. Specifications
Controller
Enclosure NEMA 4X / IP66
Enclosure Dimensions 6.4 in. x 2.5 in. x 3.2 in. (163 x 64 x 82mm)
Power supply 120 or 220 VAC, 50/60 Hz.
Fuses 5A x 2
Display LCD 0 - 9,999 µS/cm range 1µS/cm resolution
Set Point range 0 - 9,999 µS/cm range 1µS/cm increments
Set Point differential Fixed 5% below the set point
(Hysteresis)
Accuracy +/- 2% of scale
Maximum Relay Output Current 120 VAC
• 5A Resistive/General use
• 4LRA/FLA, 1/10HP (motors)
220 VAC
• 5A Resistive/General use
• Not rated for motors
Probe
Maximum temperature 122° F (50°C)
Temperature compensation
range 32°F – 122°F (0° – 50°C)
Maximum pressure 125 PSI (8.6 BAR)
Probe type Toroidal
Maximum cable length 98.4 Feet (30 Meters)
Materials of construction Polypropylene
.5 in. Standard thread - excludes tee
Thread size and reducer bushing
1.5 in. (38 mm)- Excludes Tee and
Maximum outside diameter Reducer
Flow Switch
Maximum temperature 127°F (52°C)
Maximum pressure 125 PSI (8,6 BAR)
Activate flow rate Approximately 1 GPM (3,785 LPM)
Materials of construction PVC and Glass filled Polypropylene
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Flow Switch Conductivity probe with tee
Fig. 6 Fig. 7
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Controller powers up but Conductivity over maximum range Reduce the system conductivity.
displays "9999 Err"
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9. Controller Mounting Dimensions
Fig. 8
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MICROtrac Factory Service Policy
Your MICROtrac controller is a state of the art microprocessor based controller. If you are experiencing a
problem with your Microtrac controller, first consult the troubleshooting guide in this manual. If the
problem cannot be resolved contact Technical Services for assistance.
PULSAFEEDER INC. (SPO)
27101 AIRPORT ROAD
PUNTA GORDA, FL 33982
941-575-3800
Trained technicians are available to help diagnose your controller or process problems.
All returns require a Return Authorization number to be issued by Pulsafeeder. Parts purchased to correct
a warranty issue may be credited after an examination of original parts by Pulsafeeder. Warranty parts
returned as defective which test good will be sent back freight collect. No credit will be issued on any
replacement electronic parts.
Any modifications or out-of-warranty repairs will be subject to associate parts and labor costs.
EC Declaration of Conformity
We, Pulsafeeder Inc., declare under sole responsibility that Microtrac equipment to which this declaration
relates is in sole conformity with relevant sections of the applicable EC standards and other normative
documents listed on this document. If changes are made to the product which is covered by this declaration
of conformity, the declaration of conformity is no longer valid.
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USA European Union (EU)
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