Delta VFD-VE Series Drive Fault Codes List

Access the complete reference guide for Delta VFD-VE FOC drive fault codes. Learn to diagnose PG feedback (PGF) errors, tension control issues, and use VFDSoft for analysis.

Delta VFD-VE Fault Codes Reference Table

Fault Code	Cause & Solution
EF External Fault	Cause: External Fault- This is programmable fault, comes when drive received external signal for external fault. Soultion: 1. Input EF (N.O.) on external terminal is closed to GND. Output U, V, W will be turned off. 2. Give RESET command after fault has been cleared.
bb External Base Block	Cause: This fault comes when drive received this command. Soultion: 1. When the external input terminal (B.B) is active, the AC motor drive output will be turned off. 2. Deactivate the external input terminal (B.B) to operate the AC motor drive again.
bF Brake resistor fault	Cause:  Brake resistor fault Soultion:  1. If the fault code is still displayed on the keypad after pressing “RESET” key, then there is an hardware issue in drive need to repair or replace drive.
occ Short-circuit	Cause: Short-circuit is detected between upper bridge and lower bridge of the IGBT module. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive.
OL Overload	Cause: The AC motor drive detects excessive drive output current. NOTE: The AC motor drive can withstand up to 150% of the rated current for a maximum of 60 seconds. Soultion: 1. Check whether the motor is overloaded. 2. Take the next higher power AC motor drive model.
ocA Over-current during acceleration	Cause: Over-current during acceleration (Output current exceeds triple rated current during acceleration.). Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output lines. 2. Acceleration Time too short: Increase the Acceleration Time. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.
ocd Over-current during deceleration	Cause: Over-current during deceleration (Output current exceeds triple rated current during deceleration.) Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output line. 2. Deceleration Time too short: Increase the Deceleration Time. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.
ocn Over-current during steady state operation	Cause: Over-current during steady state operation (Output current exceeds triple rated current during constant speed.) Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output line. 2. Sudden increase in motor loading: Check for possible motor stall. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.
ocs oc5 Hardware failure in current detection	Cause: Hardware  failure in current detection. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive.
GFF Ground Fault	Meaning: When the drive detects grounding short circuit on the output terminals (U/V/W), the drive closes the gate of the output immediately, the motor runs freely, and the display shows a GFF error. Cause & Solution: 1. Motor burnout or aging insulation occurred – Check the motor insulation value with megger. – Replace the motor if the insulation is poor. 2. Short circuit due to broken cable – Troubleshoot the short circuit. – Replace the cable. 3. Larger stray capacitance of the – cable and terminal – If the motor cable length exceeds 100 m, decrease the setting value for the carrier frequency. – Take remedies to reduce stray capacitance. 4. Malfunction caused by interference – Verify the grounding and wiring of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance. 5. Hardware failure – Cycle the power after checking the status of motor, cable and cable length. If GFF still exists, return to the factory for repair.
occ Short-circuit	Cause: Short-circuit is detected between upper bridge and lower bridge of the IGBT module. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive.
ouA/ovA DC BUS over-voltage during acceleration	Cause: DC bus over-voltage during acceleration. Solution: 1. Check if the input voltage falls within the rated AC motor drive input voltage range. 2. Check for possible voltage transients. 3. If DC BUS over-voltage due to regenerative voltage, please increase the Deceleration Time or add an optional brake resistor.
oud/ovd DC BUS over-voltage during deceleration	Cause: DC BUS over-voltage during deceleration (230V: DC 450V; 460V: DC 900V). Soultion: 1. Check if the input voltage falls within the rated AC motor drive input voltage range. 2. Check for possible voltage transients. 3. If DC BUS over-voltage due to regenerative voltage, please increase the Deceleration Time or add an optional brake resistor.
oun/ovn DC BUS over-voltage in constant speed	Cause: DC BUS over-voltage in constant speed (230V: DC 450V; 460V: DC 900V). Soultion: 1. Check if the input voltage falls within the rated AC motor drive input voltage range. 2. Check for possible voltage transients. 3. If DC BUS over-voltage due to regenerative voltage, please increase the Deceleration Time or add an optional brake resistor.
ous/ou5 Hardware failure	Cause: Hardware failure in voltage detection. Soultion: 1. Check if input voltage is within specification range and monitor if there is surge voltage.
LuA/LvA DC BUS voltage during acceleration	Cause: DC BUS voltage is less than Pr.06-00 during acceleration Soultion: 1. Check if the input voltage is normal 2. Check for possible sudden load
Lud/Lvd DC BUS voltage is less than during deceleration	Cause: DC BUS voltage is less than Pr.06-00 during deceleration Soultion: 1. Check if the input voltage is normal 2. Check for possible sudden load
Lun/Lvn DC BUS voltage is less than in constant speed	Cause: DC BUS voltage is less than Pr.06-00 in constant speed. Soultion: 1. Check if the input voltage is normal 2. Check for possible sudden load
LuS/Lu5 LvS/LvS DC BUS voltage is less at stop	Cause: DC BUS voltage is less than Pr.06-00 at stop Soultion: 1. Check if the input voltage is normal 2. Check for possible sudden load
PHL Phase Loss	Cause: Meaning: Input phase loss. Solution: 1. Check Power Source Input if all 3 input phases are connected without loose contacts. For models 40hp and above, please check if the fuse for the AC input circuit is blown.
oH1 IGBT overheating	Cause: IGBT overheating IGBT temperature exceeds protection level 1 to15HP: 90 o C 20 to 100HP: 100 o C. Soultion: 1. Ensure that the ambient temperature falls within the specified temperature range. 2. Make sure that the ventilation holes are not obstructed. 3. Remove any foreign objects from the heatsinks and check for possible dirty heat sink fins. 4. Check the fan and clean it. 5. Provide enough spacing for adequate ventilation.
oH2 Heatsink overheating	Cause:  Heatsink overheating Heat sink temperature exceeds 90 o C. Soultion: 1. Ensure that the ambient temperature falls within the specified temperature range. 2. Make sure that the ventilation holes are not obstructed. 3. Remove any foreign objects from the heatsinks and check for possible dirty heat sink fins. 4. Check the fan and clean it. 5. Provide enough spacing for adequate ventilation.
oH3 Motor overheating	Cause: Motor overheating The AC motor drive detects that the internal temperature exceeds Pr.06-30 (PTC level). Soultion: 1. Make sure that the motor is not obstructed. 2. Ensure that the ambient temperature falls within the specified temperature range. 3. Take the next higher power AC motor drive model.
TH1o OH1 hardware failure	Cause: OH1 hardware failure Meaning: IGBT hardware failure in temperature detection- NTC broken or wiring failure. – When the IGBT temperature is higher than the protection level, and detection time exceeds 100 ms, the tH1o protection activates. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive.
TH2o OH2 hardware failure	Cause: OH2 hardware failure Meaning: IGBT hardware failure in temperature detection- NTC broken or wiring failure. – When the IGBT temperature is higher than the protection level, and detection time exceeds 100 ms, the tH1o protection activates. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive.
FAn Fan failure	Cause: Fan failure. Solution: 1. Make sure that the fan is not obstructed. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
FuSE Broken fuse	Cause: Broken fuse- The fuse at DC side is broken for 30hp and below. Soultion: 1. Check whether the fuse of the transistor module is functioning well 2. Check whether the loading side is short- circuit
EoL1 Electronics thermal relay 1 protection	Cause: Electronics thermal relay 1 protection. Soultion: 1. Check the setting of electronics thermal relay (Pr.06-14) 2. Take the next higher power AC motor drive model
EoL2 Electronics thermal relay 2 protection	Cause: Electronics thermal relay 2 protection. Soultion: 1. Check the setting of electronics thermal relay (Pr.06-28) 2. Take the next higher power AC motor drive model
ot1/ot2 Over torque	Cause: These two fault codes will be displayed when output current exceeds the over-torque detection level (Pr.06-07 or Pr.06- 10) and exceeds over-torque detection(Pr.06-08 or Pr.06-11) and it is set 2 or 4 in Pr.06-06 or Pr.06-09. Soultion: 1. Check whether the motor is overloaded. 2. Check whether motor rated current setting (Pr.05-01) is suitable 3. Take the next higher power AC motor drive model.
cF1 Internal EEPROM can not be programmed	Cause: Internal EEPROM can not be programmed. Soultion: 1. Press “RESET” key to the factory setting 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
cF2 Internal EEPROM can not be read	Cause: Internal EEPROM can not be read. Soultion: 1. Press “RESET” key to the factory setting 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
cd0 Isum error	Cause: Isum error Soultion: 1. Re-power on to try it. 2. If fault code is still displayed on the keypad then there is an hardware issue in drive need to repair or replace drive.
cd1 U-phase error	Meaning: U-phase current detection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. Check drive IGBT using multimeter. 3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
cd2 V-phase error	Meaning: V-phase current detection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. Check drive IGBT using multimeter. 3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
cd3 W-phase error	Meaning: W-phase current detection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. Check drive IGBT using multimeter. 3. If fault not reset then there is hardware issue in drive need to repair or replace drive.
Hd0 CC current clamp	Meaning: cc (current clamp) hardware protection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
Hd1 OC hardware error	Meaning: oc hardware protection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
Hd2 OV hardware error	Cause: OV hardware error Soultion: 1. Re-power on to try it. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
Hd3 GFF hardware error	Cause: Occ hardware error Soultion: 1. Reboots the power. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
AUE Auto tuning error	Meaning: Motor auto-tuning error. Soultion: 1. Check cabling between drive and motor 2. Retry again
AFE PID loss (ACI)	Cause: PID loss (ACI) – When the analog input < 4 mA (only detects 4–20 mA analog input). Soultion: 1. Check the wiring of the PID feedback 2. Check the PID parameters settings
PGF1 PG feedback error	Cause: PG feedback error Soultion: 1. Check if Pr.10-01 is set to 0 when it is PG feedback control.
PGF2 PG feedback loss	Cause: PG feedback loss Soultion: 1. Check the wiring of the PG feedback
PGF3 PG feedback stall	Cause: PG feedback stall. Solution: 1. Check the wiring of the PG feedback 2. Check if the setting of PI gain and deceleration is suitable 3. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
PGF4 PG slip error	Cause: PG slip error. Soultion: 1. Check the wiring of the PG feedback 2. Check if the setting of PI gain and deceleration is suitable 3. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
PGR1 Pulse input error	Cause: Pulse input error. Soultion: 1. Check the pulse wiring. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
PGr2 Pulse input loss	Cause: Pulse input loss. Soultion: 1. Check the pulse wiring. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive.
ACE ACI loss	Cause: Analog input loss(ACI) (including all the 4–20 mA analog signal) – When the analog input is < 4 mA (only detects 4–20 mA analog input) Soultion: 1. Check the ACI wiring 2. Check if the ACI signal is less than 4mA
EF External Fault	Cause: External Fault- This is programmable fault, comes when drive received external signal for external fault. Soultion: 1. Input EF (N.O.) on external terminal is closed to GND. Output U, V, W will be turned off. 2. Give RESET command after fault has been cleared.
EF1 Emergency stop	Cause: This fault comes when drive received emergency stop command. Soultion: 1. When the multi-function input terminals MI1 to MI6 are set to emergency stop, the AC motor drive stops output U, V, W and the motor coasts to stop. 2. Press RESET after fault has been cleared.
bb External Base Block	Cause: This fault comes when drive received this command. Soultion: 1. When the external input terminal (B.B) is active, the AC motor drive output will be turned off. 2. Deactivate the external input terminal (B.B) to operate the AC motor drive again.
PcodE Password is locked	Cause: Entering the wrong password three consecutive times. – Entering the wrong password three consecutive times. Soultion:  1. Keypad will be locked. 2. Turn the power ON after power OFF to re-enter the correct password. 3. See Pr.00-07 and 00-08.
cE1 Illegal function code	Cause: Illegal function code. Soultion: 1. Check if the function code is correct (function code must be 03, 06, 10, 63)
cE2 Illegal data address	Cause: Illegal data address- When the input data address is incorrect. Solution: 1. (00H to 254H) Check if the communication address is correct.
ce3 Illegal data value	Cause:  Illegal data value- When the length of communication data is too long. Soultion: 1. Check if the data value exceeds max./min. value.
cE4 Data is written to read-only address	Cause: Data is written to read-only address- When the data is written to read-only address. Soultion: 1. Check if the communication address is correct.
cE10 Communication time-out	Cause: When the communication time exceeds the detection time of Pr.09-03 communication time-out). - COM1: exceeds Pr.09-03 setting, - COM2: exceeds Pr.09-07 setting Soultion: 1. Check if the wiring for the communication is correct.
cP10 Keypad (KPV-CE01) communication time-out	Cause:  Keypad (KPV-CE01) communication time-out: - COM1: exceeds Pr.09-03 setting, - COM2: exceeds Pr.09-07 setting Soultion: 1. Check if the wiring for the communication is correct 2. Check if there is any wrong with the keypad
bF Brake resistor fault	Cause:  Brake resistor fault Soultion:  1. If the fault code is still displayed on the keypad after pressing “RESET” key, then there is an hardware issue in drive need to repair or replace drive.
Ydc Y-connection /Δ- connection switch error	Cause:  Y-connection/Δ- connection switch error- ydc occurs when the confirmation signals of Y-connection and Δ-connection are conducted at the same time. Soultion: 1. Check the wiring of the Y-connection/Δ- connection 2. Check the parameters settings
dEb Deceleration energy backup error	Cause:  When Pr.07-13 is not 0, and the power is suddenly off, causing the DC bus voltage lower than the dEb action level, the dEb function acts and the motor ramps to stop. Then dEb displays on the keypad. – When Pr.07-13 is not 0, and the DC bus voltage is lower than the level of dEb. Solution: 1. Unstable power source or the power is off – Check the power system. 2. There is any other large load operates in the power system – 1. Replace power system with a larger capacity. – 2. Use a different power system from the large load system.
oSL Over slip warning	Cause:  It will be displayed when slip exceeds Pr.05-26 setting and time exceeds Pr.05- 27 setting. Soultion: 1. Check if motor parameter is correct (please decrease the load if overload 2. Check the settings of Pr.05-26 and Pr.05- 27
bEb broken belt	Cause: It will be displayed when broken belt detection function is enabled(Pr.08-59), allowance error is higher than Pr.08-61 and detection time exceeds Pr.08-62. Soultion: 1. Check if the belt is broken 2. Check the settings of Pr.08-60, Pr.08-62 and Pr.08-63
tdEu	Cause: It will be displayed when the allowance error of tension PID feedback exceeds Pr.08-63 setting and allowance error detection time exceeds Pr.08-64 setting. Soultion: 1. Check if the PID feedback is correct 2. Check if the material is broken 3. Check the settings of Pr.08-63 and Pr.08- 64

 

How to Read VFD-VE Faults via Keypad & VFDSoft

Since the VFD-VE is used in complex tension and position applications, simple error codes are rarely enough. In 2026, utilizing PC tools is standard practice for diagnosis:

• Parameter Group 06 (Protection):
  • 06-17 to 06-22: Stores the history of the last 6 faults.
  • 06-23 to 06-28: Records status data (Frequency, Current, Voltage) at the time of the trip. Checking 06-24 (Output Current) is vital to see if the motor was actually overloaded or if the sensor was just noisy.
• VFDSoft (PC Tool): Connect your laptop via the RS-485 port. For tension control applications, use the Data Scope feature to trace “Torque Reference” vs. “Actual Speed.” If the drive trips on “PGF” (PG Feedback Error), the scope will show if the encoder signal dropped out before or after the stop command.
• PG Card Status: The VFD-VE relies on an option card (e.g., EMV-PG01) for encoder feedback. Ensure the LEDs on this card are active; a dead card is the primary cause of FOC failures.

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Frequently Asked Questions (FAQ)

Q: What does the “PGF1” or “PGF2” code mean?

A: These are the most common faults on the VFD-VE series.

• PGF1: The drive detects the encoder signal is missing. Check for broken wires or a loose coupling on the motor shaft.
• PGF2: The drive detects the encoder direction is reversed. Swap the A and B phase wires on the terminal block or change Parameter 10-02 (Encoder Input Type).

Q: How do I reset a Delta VFD-VE fault?

A:

1. Press the RESET key on the KPV-CE01 keypad.
2. Trigger the External Reset (Multi-function Input configured to 05).
3. Power cycle the drive (essential for hardware flags like GFF or OCc).

Q: Why does the drive trip on “Auto-Tuning” (Fault AUE)?

A: The VFD-VE requires accurate motor data for FOC. If Auto-Tuning fails:

• Ensure the motor is completely uncoupled from the load (for Rotational Tuning).
• Check that the motor nameplate data (Group 01) is entered exactly.
• If the motor cannot be uncoupled, try “Static Tuning” (Parameter 02-01 = 2), though performance may be lower.