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Maintenance – Electronic Products
SubMonitor
SubMonitor Troubleshooting
FAULT MESSAGE PROBLEM/CONDITION POSSIBLE CAUSE
SF Amps Set Too High
SF Amps setting above 359 Amps. Motor SF Amps not entered.
Phase Reversal
Reversed incoming voltage phase sequence. Incoming power problem.
Underload
Normal 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.
Overload
Normal 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.
Overheat
Motor temperature sensor has detected excess
motor temperature.
High or low line voltage.
Motor is overloaded.
Excessive current unbalance.
Poor motor cooling.
High water temperature.
Excessive electrical noise
(VFD in close proximity).
Unbalance
Current difference between any two legs
exceeds programmed setting.
Phase loss.
Unbalanced power supply.
Open delta transformer.
Overvoltage
Line voltage exceeds programmed setting. Unstable power supply.
Undervoltage
Line voltage below programmed setting.
Poor connection in motor power circuit.
Unstable or weak power supply.
False Starts
Power has been interrupted too many times in a
10 second period.
Chattering contacts.
Loose connections in motor power circuit.
Arcing contacts.
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