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VFD SYSTEM TRIP CODE TROUBLESHOOTING

Fault Applies To Possible Causes Corrective Action
Short circuit
Either Option
Shorted motor cables Check motor wires and drop cable for shorts or bad connections
Shorted motor Replace motor
Damaged wire insulation Check drop cable for insulation damage
Internal hardware short If motor is disconnected and the fault is present when reset, replace drive
Locked Rotor
Either Option
Motor/pump misaligned Verify pump is mounted flush on motor mounting flange.
Bound pump Check for debris n pump
Transducer Found (Switch Control) Pressure Switch Drive set for Switch control, but a transducer signal was detected. Change drive control choice from Switch to Transducer in Control Choice menu
Shorted Transducer (Transducer Control)
Transducer
Drive has detected a short circuit between S1 & S2 terminals Internal short of transducer. Replace transducer.
Switch is hooked up between S1 & S2 Replace switch with transducer.
Open Transducer (Transducer Control)
Transducer
Transducer lead not connected properly to transducer (or cut) Check transducer lead connection and/or replace transducer lead wire.
Loose connection on terminals S1 & S2 Check transducer lead connection at drive terminals S1 & S2
Transducer lead wire backwards at S1 & S2 terminals Switch transducer leads at S1 & S2
Transducer failed as an open circuit Replace transducer
Deadhead (Switch control)
Pressure Switch
Pump running against a closed discharge. Make sure that there is not a valve closed or obstruction between the pump and pressure switch
Damaged or clogged pressure switch Check continuity across switch contacts without wire connected and replace and/or clean pressure port.
Deadhead sensitivity incorrect Adjust deadhead sensitivity in Underload Protection menu
Deadhead/Low PSI (Transducer Control)
Transducer
Pump running against a closed discharge. Make sure that there is not a valve closed or obstruction between the pump and pressure transducer
Deadhead sensitivity incorrect Adjust deadhead sensitivity in Underload Protection menu
Clogged pressure transducer Check transducer for pressure port and clean
Damaged or inoperative transducer Replace transducer
Dry Well
Either
Over pumped/dry well Wait for well to recover and automatic restart timer to time out
Blocked pump screen Clear pump screen
Broken pump shaft Replace pump shaft (or pump)
Worn pump Replace pump
Under Voltage
Either
Low line voltage Check line voltage. Report low voltage to the power company
Power was removed from Drive Check voltage is present on all input lines & connections secure
(Color) Leg Open
Either
Loose connection Check connections on drive motor terminals for leg specified
Defective splice Check all splice connections on drop cable for leg specified
Defective cable Check continuity of drop cable for leg specified
Open motor winding Replace motor
Overheated
Either
Excessive heating of Drive
Check that the ambient temperature is not above 125°F
Check for obstructed or inoperable fan
Check for blocked vents
Broken Pipe

Either

Drive has been running without going into standby mode for set time Check for broken or leaking pipe and repair as necessary
Application calls for long run time
Increase broken pipe run time in Advanced Feature menu
Turn off Broke Pipe protection in Advanced Feature menu
External Trip Either Contacts closed on "Alarm In" terminals Check condition of switch wired into "Alarm In" terminals

 

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