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