AIM Manual

Electronic Maintenance » Electronic Controls (Page 70)

SubMonitor Troubleshooting

SubMonitor

SubMonitor Troubleshooting

Fault MessageProblem/ConditionPossible Cause
SF Amps Set Too HighSF Amps setting above 359 Amps.- Motor SF Amps not entered.
Phase ReversalReversed incoming voltage phase sequence.- Incoming power problem.
UnderloadNormal line current.- Wrong SF Max Amps setting.
Low line current.- Over pumping well.
- Clogged pump intake.
- Closed valve.
- Loose pump impeller.
- Broken shaft or coupling.
- Phase loss.
OverloadNormal line current.- Wrong SF Max Amps setting.
High line current.- High or low line voltage.
- Ground fault.
- Pump or motor dragging.
- Motor stalled or bound pump.
OverheatMotor temperature sensor has detected excess- High or low line voltage.
- Motor is overloaded.
- Excessive current unbalance.
- Poor motor cooling.
- High water temperature.
- Excessive electrical noise (VFD in close proximity).
UnbalanceCurrent difference between any two legs exceeds programmed setting.- Phase loss.
- Unbalanced power supply.
- Open Delta transformer.
OvervoltageLine voltage exceeds programmed setting.- Unstable power supply.
UndervoltageLine voltage below programmed setting.- Poor connection in motor power circuit.
- Unstable or weak power supply.
False StartsPower has been interrupted too many times in a 10 second period.- Chattering contacts.
- Loose connections in motor power circuit.
- Arcing contacts.