FMI CTS Series - Manual (Page 9)

IN-CTS-10
Tips from the Field
The CTS has been dynamically tested, including the integrity of all internal fluid connections, prior to shipment. The C100A
control unit is factory adjusted for optimum performance with the CTS, and no additional adjustment of internal trim pots should
be required.
However, if a newly installed CTS with C100A System fails to operate properly, the following is a step by step troubleshooting
guide to determine the cause and corrective action.
When diagnosing problems with the CTS System, it should be first determined if the problem is related to the electronics circuit
which includes C100 A, power supply, input control signal, and wiring. If the electronics appear to be operating properly, the
fluidic circuit, which includes tubing, valving, fittings etc should be examined.
First determine if the problem is Electronic or Fluidic.
ƒ If the motor is not rotating, begin with step 1 of ELECTRONICS.
ƒ If the motor is rotating but no fluid is being pumped, proceed to step 1 of FLUIDICS.
ELECTRONICS:
1) With the C100A in the OFF position, rotate the rotary speed pot CCW to the “0” speed position.
2) Check all wiring connections between the C100A and the CTS, and (if applicable) between the C100A and the 4-20 mA
control source.
3) With the speed pot still in the “0” position, switch the power of the C100A to the “ON” position, which is the manual speed
adjustment mode.
4) Increase the speed control CW gradually to a setting between 5 and 6 and observe the pump motor to see if it’s rotating. If
“yes”, go to step 1 of FLUIDICS. If “NO”, turn speed pot to “0”, switch C100A to “OFF” position, and disconnect power.
5) Open the CTS enclosure and see of the motor spindle (silver cylinder on right side of motor) rotates freely by hand. If “yes”,
continue to step 6. If “no”, call factory.
6) With enclosure open, turn C100A to “on” position, set speed control to “5”, and using a multi-tester, check the DC voltage at
the terminal block of the CTS. The voltage should be between 30-40 volts. If “yes”, call factory. If “no”, check the power input
to the CTS which should be 115V approximately. If “yes”, check fuse. If “no”, the power source is the problem.
FLUIDICS:
Pump will not prime:
1) Verify proper mounting location relative to supply vessel according to Diagram 5.
2) If motor is rotating and no fluid is being pumped, check the inlet tubing to see if there is fluid in the tubing, and that the inlet
bulkhead fitting (on the inside and outside inlet connections) is tight and not leaking air. If you observe that fluid level in the inlet
tube rises properly to the bulkhead fitting, turn off power to the motor and watch the fluid level at the inlet tube. It should drop
back momentarily when the motor stops, but should stop falling when observed for approximately 15 seconds. If the fluid
continues to fall, there is a suction air leak, which must be corrected.
3) Make sure all valves on the inlet side (fluid source) are open, and that there is an adequate level of fluid in the supply vessel.
Ensure that inlet tubing has not deformed due to suction (collapsed) whereby creating pump cavitation.
4) Check the mechanical flow setting of the fluid pump head (right side of motor) to make sure that it is set for a minimum of
10% stroke.
5) Make sure the tubing is sized correctly for the desired fluid flow. For flows below 500 ml/min, 1/4” OD tubing is
recommended. For flows above 500 mL/min 3/8” - 1/2” ID tubing is recommended. Tubing sized too small, relative to flow,
may cause cavitation problems, while tubing sized too large may cause vertical lift issues. Consult factory for additional
recommendations.
Pump Primes but there is no fluid output:
Check tubing, connections and valving to make sure there are no closed valves or obstruction between the CTS and the output
destination (typically a groundwater well or water main).
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