MAINTENANCE
Troubleshooting
32
Diagnostic Fault Codes
Flashes
Fault
Possible Cause
Corrective Action
x 1
Motor Underload
• Over-pumped well
• Broken shaft or coupling
• Blocked screen, worn pump
• Air/gas locked pump
• Incorrect motor/pump hp setting
• Incorrect Underload Sensitivity
setting
• Frequency near maximum with load less than configured
underload sensitivity (Potentiometer)
• System is drawing down to pump inlet (out of water)
• High static, light loading pump - reset Potentiometer for less
sensitivity if not out of water
• Air/gas locked pump - if possible, set deeper in well to
reduce
• Verify DIP switches are set properly
x 2
Undervoltage/
Overvoltage
• Low line voltage
• High input voltage
• Misconnected input leads
• Loose connection at breaker or
panel
• Incorrect motor voltage setting
• Check incoming line voltage
•For 115 VAC, line should be 105-130 VAC
•For 230 VAC, line should be 190-260 VAC
• Check incoming power connections and correct or tighten if
necessary
• Correct incoming voltage - check circuit breaker or fuses,
contact power company
x 3
Locked Pump
• Motor and/or pump
misalignment
• Dragging motor and/or pump
• Abrasives in pump
• Amperage above SFA
• Verify correct motor/pump hp setting
• Remove and repair or replace as required
x 5
Open Circuit
• Loose connection
• Defective motor or drop cable
• Incorrect motor
• Open circuit reading on DC test
at startup
• Check motor terminal connections, tighten and repair as
necessary
• Disconnect motor leads and check drop cable and motor
resistance
• Check drive with a “dry” benchtop motor. If drive will not run
the motor or achieve underload fault at max frequency,
replace the drive.
x 6
Short Circuit
Over Current
• If fault occurs immediately after
power-up:
•Short circuit due to shorted
connection
•Defective cable
•Bad splice or failed motor
• If fault occurs while motor
running:
•Over current due to trapped
debris in pump
•Incorrect motor/pump hp
setting
• Amperage exceeded 72 amps on
DC test or while running
• Incorrect wiring
• Phase to phase short circuit
• Phase to ground short circuit
• Verify wire connections at motor terminal block
• Disconnect motor leads and use megger to check motor
insulation resistance; if low reading, replace motor
• If fault is still present after resetting the drive and removing
motor leads, replace drive
