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FLSC-45/45B Paddlewheel Signal Conditioner
7
Troubleshooting
In case of an inoperable or malfunctioning system, the following procedures can be
used to isolate the faulty wiring, printed circuit boards and/or alternate causes. Factory
consultation is available to assist in diagnosing problems. Please note that in some cases
factory repair can be performed more easily than can be accomplished in the field.
Failure conditions are listed and the possible corrective actions given to eliminate the
observed problem.
Proper operation of the FLSC-45 can be assumed when with power applied to the
unit, the analog output produces a current output signal of 4-20 mA with a span
corresponding to that established by the calibration procedure.
OBSERVED CONDITION
CORRECTIVE ACTION
A. Analog output with
1. Noise on input. Slowly turn SENS pot CCW (refer to
no input Figure 4) until false indication stops. NOTE:
In fully CCW position, the unit will not operate.
2. Defective FLSC-45. Repair or replace.
B. Incorrect zero reading
1. Verify that power supply voltage is sufficient for the
with no flow
required load resistance.
2. Unit is out of calibration. Recalibrate.
3. Defective FLSC-45. Repair or replace.
OBSERVED CONDITION
CORRECTIVE ACTION
C. Current exceeds
1. Flowmeter being used beyond calibrated span of
desired span
FLSC-45.
2. Calibration of FLSC-45 incorrect. Recalibrate.
3. Defective unit. Repair or replace.
D. No current output at all 1 . Power supply is reversed. Check wiring as per wiring
installation.
2. Short on flowmeter coil or shield. Replace coil and
check wiring.
3. Defective unit. Repair or replace.