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5.1 Troubleshooting
Troubles
Pump air locked
Check valve back flow defective
Insufficient pump capacity
Bad connection to the pressure transducer
The operating
The infiltration of foreign object into the pump
pressure does
Broken coupling
not increase after
Pump reverse rotation
pump starts.
The discharge valve closed
Air infiltration into the discharge pipe
Discharge pipe crack (low pressure alarm condition)
Damage on the pressure transducer
Incorrect VFD stop rate
Bad connection to the pressure transducer
Pump does
Defective pressure transducer
not stop.
Check valve back flow
Abnormal air pressure tank
Pump repeats
Insufficient pressure tank capacity
start and stop too
frequently.
Abnormal voltage
Defective motor
Over current
The pump is broken
and trip while
The infiltration of foreign object into the pump
pump runs.
Circuit breaker off
No water in the reservoir
The motor is out of order
Abnormal voltage
Pump does not
VFD tripped
start after turning
The pressure transducer is out of order
on the power.
Bad motor wiring
Bad panel control cable connection
Pump running out
of sequence.
Excessive noise
LCD display is
not viewable.
LCD defective
SJE ®
Chapter 5
Major Cause
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Replace the pressure transducer
Increase VFD stop rate
Connect the pressure transducer hose
Compare pressure gauge to transducer, replace if necessary
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Check the voltage
Consult your mechanical contractor
Consult your mechanical contractor
Consult your mechanical contractor
Turn on the circuit breaker
Fill the reservoir with water
Repair the motor or replace it
Check the voltage
Reset VFD
Repair the pressure transducer or replace it
Check the motor wiring and correct it if required
Correct the cable connection
Turn off the power and turn on, or reset
Replace LCD
20
Actions
VFDC-4100 Controller User Manual
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