Fault Code Information for Delta VFD-EL
  The AC motor drive has a comprehensive fault diagnostic system that includes several different alarms and fault messages. Once a fault is detected, the corresponding protective functions will be activated. The following faults are displayed as shown on the AC motor drive digital keypad display.
The five most recent faults can be read from the digital keypad or communication.
Note ; Wait 5 seconds after a fault has been cleared before performing reset via keypad of input terminal.

  How to Reset
  There are three methods to reset the AC motor drive after solving the fault:
1. Press key on keypad.
2. Set external terminal to “RESET” (set one of Pr.04.05~Pr.04.08 to 05) and then set to be ON.
3. Send “RESET” command by communication.
Note: Make sure that RUN command or signal is OFF before executing RESET to prevent damage or personal injury due to immediate operation.


OC Over current
Abnormal increase in current.
1. Check if motor power corresponds with the AC motor drive output power.
2. Check the wiring connections to U/T1, V/T2,W/T3 for possible short circuits.
3. Check the wiring connections between the AC motor drive and motor for possible short circuits, also to ground.
4. Check for loose contacts between AC motor drive and motor.
5. Increase the Acceleration Time.
6. Check for possible excessive loading conditions at the motor.
7. If there are still any abnormal conditions when operating the AC motor drive after a shortcircuit is removed and the other points above are checked, it should be sent back to manufacturer.
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Ou (OV) Over voltage
The DC bus voltage has exceeded its maximum allowable value.
1. Check if the input voltage (fuse) falls within the rated AC motor drive input voltage range.
2. Check for possible voltage transients.
3. DC-bus over-voltage may also be caused by motor regeneration. Either increase the Decel. Time or add an optional brake resistor (and brake unit).
4. Check whether the required brake power is within the specified limits.
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OH1 Overheating Heat sink temperature too high
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.
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Lu Low voltage

The AC motor drive detects that the DC bus voltage has fallen below its minimum value.
1. Check whether the input voltage falls within the AC motor drive rated input voltage range.
2. Check for abnormal load in motor.
3. Check for correct wiring of input power to R-ST (for 3-phase models) without phase loss.
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oL Overload

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.
1. Check whether the motor is overloaded.
2. Reduce torque compensation setting in Pr.07.02.
3. Use the next higher power AC motor drive model.
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oL1 Overload 1
Internal electronic overload trip
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.
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oL2 Overload 2
Motor overload.
1. Reduce the motor load.
2. Adjust the over-torque detection setting to an appropriate setting (Pr.06.03 to Pr.06.05).
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 - CC (current clamp)
 - OV hardware error
 - GFF hardware error
 - OC hardware error
 You can contact Delta automation department..
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bb External Base Block.
When momentary power loss is detected, the AC motor drive will block its output and then wait for a specified period of time (determined by Pr.08.07, called Base-Block Time) before resuming operation. This parameter should be set at a value to ensure that any residual regeneration voltage from the motor on the output has disappeared before the drive is activated again.
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.
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ocA Over-current during acceleration
1. Short-circuit at motor output: Check for possible poor insulation at the output lines.
2. Torque boost too high: Decrease the torque compensation setting in Pr.07.02.
3. Acceleration Time too short: Increase the Acceleration Time.
4. AC motor drive output power is too small:
Replace the AC motor drive with the next higher power model.
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ocd Over-current during deceleration
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.
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ocn Over-current during constant speed operation
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.
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EF External Fault
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.
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cF 10 Internal EEPROM can not be programmed. Return to the factory.
cF 11 Internal EEPROM can not be programmed. Return to the factory.
cF20 Internal EEPROM can not be read.
1. Press RESET key to set all parameters to factory setting.
 You can contact Delta automation department..
cF21 Internal EEPROM can not be read.
1. Press RESET key to set all parameters to factory setting.
 You can contact Delta automation department..
cF30 U-phase error
cF31 V-phase error
cF32 W-phase error
cF33 OV or LV
cF34 Temperature sensor error
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GFF Ground fault
When (one of) the output terminal(s) is grounded, short circuit current is more than 50% of AC motor drive rated current, the AC motor drive power module may be damaged.
Note: The short circuit protection is provided for AC motor drive protection, not for protection of the user.
1. Check whether the IGBT power module is damaged.
2. Check for possible poor insulation at the output line.
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cFA Auto accel/decel failure
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.
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cE-- Communication Error
1. Check the RS485 connection between the AC motor drive and RS485 master for loose wires and wiring to correct pins.
2. Check if the communication protocol, address, transmission speed, etc. are properly set.
3. Use the correct checksum calculation.
4. Please refer to group 9 in the chapter 5 for detail information.
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codE Software protection failure  You can contact Delta automation department..
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AErr Analog signal error

Check the wiring of ACI analog signal.
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FbE PID feedback signal error
1. Check parameter settings (Pr.10.01) and AVI/ACI wiring.
2. Check for possible fault between system response time and the PID feedback signal detection time (Pr.10.08)
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PHL Phase Loss

Check input phase wiring for loose contacts.

++ Dear visitor, you can discuss possible warnings and basic commissioning questions(s) you may encounter while using Delta  products with our product representatives on the Delta homepage.

- However, the technical support we have declared here is only valid for the products sold in the automation avm. Please, we ask you to be sensitive in this matter.

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