Over Current 1
The inverter turns off its output when the output current of the inverter flows more than 200% of the inverter rated current.
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Cause:
- Acceleration/Deceleration time is too short compared to the GD² of the load.
- Load is larger than the inverter rating.
- Inverter turns output on when the motor is free running.
- Output short or ground fault has occurred.
- Mechanical brake of the motor is operating too fast.
- Components of the main circuit have overheated due to a faulty cooling fan.
Remedy:
- Increase Accel/Decel time.
- Increase inverter capacity.
- Operate after motor has stopped.
- Check output wiring.
- Check mechanical brake operation.
- Check cooling fan.
(Caution) Operating inverter prior to correcting fault may damage the IGBT.
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Ground Fault
The inverter turns off its output when a ground fault occurs and the ground fault current is more than the internal setting value.
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Cause:
- Ground fault has occurred at the output wiring of inverter.
- The insulation of the motor is damaged due to heat.
Remedy:
- Investigate the output wiring of inverter.
- Exchange motor.
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Over Voltage
The inverter turns off its output if the DC voltage of the main circuit increases higher than the rated value (during deceleration or regen).
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Cause:
- Deceleration time is too short compared to the GD² of load.
- Regenerative load at the output.
- Line voltage high.
Remedy:
- Increase deceleration time.
- Use regenerative resistor option.
- Check line voltage.
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Over Load
(Current Limit Protection). The inverter turns off its output if the output current flows at 120% of the rated current.
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Cause:
- Load is larger than the inverter rating.
- Incorrect inverter capacity selected.
- Set incorrect V/F pattern.
Remedy:
- Increase capacity of motor and inverter.
- Select correct inverter capacity.
- Select correct V/F pattern.
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Over Heat
The inverter turns off its output if the heat sink is over heated.
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Cause:
- Cooling fan damaged or an alien substance inserted.
- Cooling system has faults.
- Ambient temperature high.
Remedy:
- Exchange cooling fans and/or eliminate alien substance.
- Check for alien substances in the heat sink.
- Keep ambient temperature under 40°C.
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E-Thermal
(Electronic Thermal). Internal calculation determines motor overheating. Overload capacity: 130% for 1 min.
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Cause:
- Motor has overheated.
- Load is larger than inverter rating.
- ETH level too low.
- Incorrect inverter capacity selected.
- Set incorrect V/F pattern.
- Operated too long at low speeds.
Remedy:
- Reduce load and/or running duty.
- Increase inverter capacity.
- Adjust ETH level to an appropriate level.
- Select correct inverter capacity.
- Select correct V/F pattern.
- Install a cooling fan with a separate power supply.
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Ext. Trip
User triggered external trip signal to stop output.
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Cause:
External Trip has occurred.
Remedy:
- Eliminate Trip at circuit connected to external trip terminal.
- Remove external trip input.
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Low Voltage
DC voltage is below the detection level (insufficient torque or potential motor overheating).
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Cause:
- Line voltage low.
- Load larger than line capacity is connected to line (e.g., welding machine, large motor starting).
- Faulty magnetic switch at the input side of the inverter.
Remedy:
- Check line voltage.
- Increase line capacity.
- Exchange magnetic switch.
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Over Current 2
IGBT Short or Output Short.
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Cause:
- Short has occurred between the upper and lower IGBT.
- Short has occurred at the output of the inverter.
- Acceleration/Deceleration time is too short compared to the GD² of load.
Remedy:
- Check IGBT.
- Check output wiring of inverter.
- Increase acceleration time.
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Output Phase Open
One or more of the output (U, V, W) phases is open.
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Cause:
- Faulty contact of magnetic switch at output.
- Faulty output wiring.
Remedy:
- Check magnetic switch at output of inverter.
- Check output wiring.
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BX
(Instant Cut Off). Used for emergency stop.
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Cause:
The BX terminal is turned ON.
Remedy:
- Turn the BX terminal OFF to return to regular operation.
- Take caution when using this function.
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HW-Diag
Inverter Hardware Fault (Control circuitry error).
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Cause:
- Wdog error (CPU fault).
- EEP error (memory fault).
- ADC Offset (current feedback circuit fault).
- Input phase open.
- NTC open.
Remedy:
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COM Error / CPU Error
Inverter cannot communicate with the keypad.
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Cause:
- Faulty connection between inverter and keypad.
- Inverter CPU malfunction.
Remedy:
- Check connector.
- Exchange inverter.
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Inv. OLT
Inverter Overload. Output current flows more than rated level (110% for 1 min, 130% for 4 sec).
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Cause:
- Load is larger than inverter rating.
- Incorrect inverter capacity selected.
Remedy:
- Increase motor and/or inverter capacity.
- Select correct inverter capacity.
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NTC open
Inverter internal NTC is opened.
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Cause:
Inverter internal NTC circuit is open/damaged.
Remedy:
- Contact the factory or your local distributor.
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LOP / LOR / LOV / LOI / LOX
Operating Method when the Speed Reference is Lost.
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Cause:
- LOP: Loss of reference from the Option (DPRAM time out).
- LOR: Remote communication network fault.
- LOV: ‘V1’ analog frequency reference lost.
- LOI: ‘I’ analog frequency reference lost.
- LOX: Sub-board (V2, ENC) analog frequency reference lost.
Remedy:
- Eliminate cause of fault (check connections/signals).
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