Delta VFD-EL Series Drive Fault Codes List
Access the complete reference guide for Delta VFD-EL micro drive fault codes. Learn to diagnose communication errors (cE10), hardware faults, and use VFDSoft.
This guide provides the most updated reference for 2026 to help you troubleshoot these compact workhorses and keep your simple machines running.
Delta VFD-EL Fault Codes Reference Table
| Fault Code | Cause & Solution |
| oL overload |
Cause: AC drive overload- Output current exceeds the AC
drive-bearable current; e.g. could sustain for 60 seconds if the output is
150% of the AC drive rated current. ‹ Soultion: - Decrease the loading and extend the acceleration time - Check whether the motor is overloaded - Reduce the torque compensation setting (Pr.07.02). - Increase the AC drive output capacity |
| EF External fault |
Cause: 1. When multi-function input terminals are set to external fault, the AC motor drive stops output.‹ Soultion: 1. When multi-function input terminals (MI3-MI9) are set to external fault, the AC motor drive stops output U, V and W. 2. Give RESET command after fault has been cleared. |
| cE-- Communication Fault |
Cause: Communication Fault. Soultion: 1. Check the RJ45 connection between the AC motor drive for loose wires and wiring to the correct pins. 2. Check if the communication protocol is properly set. 3. Refer to Parameter Group 09 Communication Parameters in Chapter 4 for detailed information. |
| oc Overcurrent |
Cause: Output current of the AC drive exceeds the OC level ‹ Soultion: - Extend the accel/decel time - Check whether the motor rating and the AC drive rating match up with each other - Check whether there is short-circuit among U-V-W of the AC drive - Check whether the wiring to the motor is short-circuited or grounded - Check whether the screw between the AC drive and the motor is tightened or not - Check whether the motor is over loaded |
| ov/ou overvoltage |
Cause: DC voltage of the main
circuit exceeds the over-voltage detection level - The DC bus voltage has exceeded its maximum allowable value. Soultion: - Check whether the input voltage is within the scope of the rated input voltage of the AC drive, and monitor whether there is any occurrence of the voltage transients - If it is of the motor inertia uprising voltage that caused the exceeding voltage on the DC high-voltage side within the AC drive, the solution is to extend the accel/decel time or install the braking resistor (optional) |
| oH1 Overheating |
Cause: Overheating- Heat sink temperature too high 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 |
| Lu/Lv Low Voltage |
Cause: DC high-voltage side is exceedingly low within the AC
drive Soultion: - Check whether the input power voltage is normal - Check whether the loading will be put on another unexpected heavy loading - Whether the 3-phase model is of the single-phase power input or the phase-lacking |
| oL overload |
Cause: AC drive overload- Output current exceeds the AC
drive-bearable current; e.g. could sustain for 60 seconds if the output is
150% of the AC drive rated current. ‹ Soultion: - Decrease the loading and extend the acceleration time - Check whether the motor is overloaded - Reduce the torque compensation setting (Pr.07.02). - Increase the AC drive output capacity |
| oL1 Overload 1 |
Cause: Overload 1- Internal electronic overload trip Soultion: 1. Check for possible motor overload. 2. Check electronic thermal overload setting. 3. Use a higher power motor. 4. Reduce the current level so that the drive output current does not exceed the value set by the Motor Rated Current Pr.07-00. |
| oL2 Motor overload |
Cause: OL2- motor overload Motor with exceedingly great loading ‹ Soultion: - Check whether the loading of the motor is too great - Adjust the over-torque detection setting to an appropriate setting (Pr.06-03 to Pr.06-05). |
| HPF1 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. |
| HPF2 OV hardware fault |
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. |
| HPF3 GFF hardware error |
Cause: GFF 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. |
| HPF4 OC hardware fault |
Cause: Oc 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. |
| bb External Base Block |
Cause: This is a programmable
fault (Refer to Pr. 08.07). 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. |
| 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. |
| EF External fault |
Cause: 1. When multi-function input terminals are set to external fault, the AC motor drive stops output.‹ Soultion: 1. When multi-function input terminals (MI3-MI9) are set to external fault, the AC motor drive stops output U, V and W. 2. Give RESET command after fault has been cleared. |
| cF1.0 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. |
| cF1.1 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. |
| cF2.0 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. |
| cF2.1 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. |
| cF3.0 U-phase error |
Cause: Wiring detection fault U-phase error. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| cF3.1 V-phase error |
Cause: Wiring detection fault V-phase error. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| cF3.2 W-phase error |
Cause: Wiring detection fault W-phase error. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| cF3.3 Wiring detection (OV or LV) |
Cause: DC bus wiring detection error.(OV or LV) Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| cF3.4 Wiring detection fault |
Cause: Temperature sensor error. 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. |
| cFA Auto accel/decel failure |
Cause: Auto accel/decel failure. Soultion: 1. Check if the motor is suitable for operation by AC motor drive. 2. Check if the regenerative energy is too large. 3. Load may have changed suddenly. |
| cE-- Communication Fault |
Cause: Communication Fault. Soultion: 1. Check the RJ45 connection between the AC motor drive for loose wires and wiring to the correct pins. 2. Check if the communication protocol is properly set. 3. Refer to Parameter Group 09 Communication Parameters in Chapter 4 for detailed information. |
| CodE Software protection failure |
Cause: Software protection failure.(Password locked) Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| AErr Analog signal error |
Cause: Analog input current loss (including all analog 4–20 mA
signals) – When the analog input is lower than 4 mA (only detects analog input 4–20 mA) Solution: 1. Loose or broken ACI wiring – Tighten the terminals again. – Replace with a new cable. 2. External device error – Replace with a new device. 3. Hardware error – If the AErr error still occurs after checking all the wiring, return to the factory for repair. |
| FbE PID feedback signal error |
Cause: PID feedback signal error. Soultion: 1. Check the parameter settings (Pr.10.01) and AVI/ACI wiring. 2. Check for possible fault between the system response time and the PID feedback signal detection time (Pr.10.08) |
| PHL Phase loss |
Cause: Power input phase-lacking Phase-lacking within the input
power of the AC drive Three imbalanced conditions existed within the input
voltage ‹ Soultion: - Check whether the power voltage is normal. - Check whether the screw at the input power terminal is tightened. |
| dEu Unusual PID feedback |
Cause: Unusual PID feedback. Soultion: 1. Check if wiring for PID feedback is correct and the parameter of PID feedback is properly set. |
How to Read VFD-EL Faults via Keypad & VFDSoft
The VFD-EL is a simple drive, but connecting it to a PC requires checking a specific physical switch. Here is how to diagnose issues in 2026:
- The RS-485 Switch: Unlike other Delta drives, the VFD-EL has a small physical switch near the control terminals. To use PC software or Modbus communication, you must ensure this switch is flipped to RS-485 mode. If it is set to “AVI” (Analog Input), you will get communication errors.
- VFDSoft (PC Tool): Connect via the RJ-45 port (RS-485). VFDSoft is the standard tool for the EL series. It allows you to monitor the DC Bus Voltage and Output Current in real-time. This is vital because the EL series has limited onboard diagnostics compared to the C2000.
- 7-Segment Display: The keypad on the EL is fixed (cannot be removed).
- Fault Code: Flashes when protection is active.
- Status: Pressing Mode during operation allows you to toggle between Frequency (H), Amps (A), and Voltage (u). Checking the “Amps” reading under load is the best way to prevent nuisance “oL” trips.
Frequently Asked Questions (FAQ)
Q: What does the “cE10” (Communication Error) code mean?
A: This is a very common issue on the VFD-EL.
- Check the RS-485/AVI Switch (located near the terminals). It must be set to RS-485 for communication.
- Verify the baud rate (Parameter 09.01) matches your PLC or PC controller.
- Check for noise interference on the communication cable (use shielded twisted pair).
Q: How do I reset a Delta VFD-EL fault?
A:
- Press the STOP/RESET button on the drive face.
- Trigger the configured External Reset (Digital Input MI1-MI6 set to Value 05).
- Power cycle the drive (wait for the display to turn off).
Q: Why does the drive trip on “GFF” (Ground Fault) at start?
A: The VFD-EL is often used with cheaper motors or in wet environments (pumps).
- GFF means current is leaking to the ground output.
- Disconnect the motor leads and Megger test the motor insulation.
- Check if the motor cable is damaged or submerged in water.
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