Hi verybody,

Delta VFD-M Fault Codes and Solutions

Motor Cannot Run
- Solutions:
+ Check the keypad for normal display.
+ Ensure non-fuse breakers and magnetic contactors are ON.
+ Check for any fault codes displayed.
+ Input the RUN command via the keypad.

Motor Speed Cannot be Changed
- Solutions:
+ Check if the maximum frequency setting is too low.
+ Ensure the frequency setting is within the specified range.
+ Verify correct wiring between M0~M5 to GND.

Motor Stalls during Acceleration
- Solutions:
+ Check if the acceleration time is too short.
+ Verify if the inertia of the motor and load is too high.
+ Check for low input voltage.
+ Ensure the load torque is not too high.

Motor Does Not Run as Expected
- Solutions:
+ Check the settings of Pr. 04 to Pr. 09 and torque compensation.
+ Ensure the output voltage of U, V, W is balanced.
+ Reduce the load or increase the power of the AC motor drive.

Electromagnetic/Induction Noise
- Solutions:
+ Add surge suppressors to  relays and contacts.
+ Shorten the control circuit or serial communication wiring and separate them from power circuit wiring.
+ Ground the terminal independently according to local regulations.
+ Use a noise filter at the mains input terminal of the AC motor drive.

 Environmental conditions affecting the AC motor drive.
- Solutions:
+ Use anti-vibration dampers to prevent vibration.
+ Store the AC motor drive in a clean and dry location.
+ Ensure the ambient temperature is within the specified range.

Over Current (OC)

    OC, ocA, ocd:
- Description: Over current during acceleration, deceleration, or steady-state operation.
- Solutions:
+ Check for short circuits or grounding between U, V, W and the motor.
+ Reduce the load or increase the power of the AC motor drive.
+ Decrease torque compensation or adjust it appropriately.
+ Increase acceleration/deceleration time.
+ Contact Delta if there is a malfunction or error due to noise.

Ground Fault (GF)

    GFF:
- Description: Ground fault in the output circuit (cable or motor) of the AC motor drive.
- Solutions:
+ Remove the ground fault.
+ Contact Delta if the AC motor drive malfunctions due to noise.

Over Voltage (OV or Ou)

    OV:
- Description: The DC BUS voltage of the AC motor drive exceeds its protection value.
- Solutions:
+ Reduce the voltage to within the specified range.
+ Increase deceleration time.
+ Use a braking unit or DC braking.

Low Voltage (LV or Lu)

    LV:
- Description: The input voltage of the AC motor drive is below the minimum value.
- Solutions:
+ Check if the input power is correct or if there is a power cut.
+ Check for any malfunction components in the power supply circuit.
+ Ensure there is no heavy load with high start current in the same power system.

+ Delta VFD-M User manuals 

+ Vfd-M Fault Codes 

+ VFD-M Fault Codes 2

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++ Delta 2 main page

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