OCt
Overcurrent |
Cause:
- Accel/Decel time is too short compared to the inertia of the load (GD²).
- Load is greater than the inverter rating.
- Inverter output is issued when the motor is free running.
- Output short circuit or ground fault has occurred.
- Mechanical brake of the motor is operating too fast.
Remedy:
- Increase the Accel/Decel time.
- Replace the inverter with appropriate capacity.
- Resume operation after stopping the motor or use P36 (Speed search).
- Check output wiring.
- Check the mechanical brake.
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GFt / GCt
Ground fault current |
Cause:
- Ground fault has occurred at the output wiring of the inverter.
- The insulation of the motor is damaged due to heat.
Remedy:
- Check the wiring of the output terminal.
- Replace the motor.
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IOL / OLt
Inverter overload / Overload trip |
Cause:
- Load is greater than the inverter rating.
- Torque boost scale is set too large.
Remedy:
- Upgrade the capacity of motor and inverter or reduce the load weight.
- Reduce torque boost scale.
|
OHt
Inverter overheat |
Cause:
- Cooling system has faults.
- Ambient temperature is too high.
Remedy:
- Check for alien substances clogged in the heat sink.
- Keep ambient temperature under 40°C.
|
COL
Condenser overload |
Cause:
- 3-Phase product may have one phase lost.
- Internal condenser was outworn.
Remedy:
- Check whether wiring of input power or inter-phase voltage is abnormal.
- It’s almost time to replace or it may happen when it is used in hot temperature for a long while. Contact after-sales service.
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POt
Output Phase loss |
Cause:
- Faulty contact of magnetic switch at output.
- Faulty output wiring.
Remedy:
- Make connection of magnetic switch at output of the inverter securely.
- Check output wiring.
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OUt
Over voltage |
Cause:
- Decel time is too short compared to the inertia of the load (GD²).
- Regenerative load is at the inverter output.
- Line voltage is too high.
Remedy:
- Increase the Decel time.
- Check whether line voltage exceeds its rating.
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LUt
Low voltage |
Cause:
- Line voltage is low.
- Load larger than line capacity is connected to line (ex: welding machine, motor’s direct input).
- Faulty magnetic switch at the input side of the inverter.
Remedy:
- Check whether line voltage is below its rating.
- Check the incoming AC line. Adjust the line capacity corresponding to the load.
- Change a magnetic switch.
|
EtA / EtB
External fault A / B contact input |
Cause:
- The multi function terminals (P66 ~ P70) set to “18 (External fault-A)” or “19 (External trip signal input : fault-B)” in P66~P70 in PG Group is ON.
Remedy:
- Eliminate the cause of fault at circuit connected to external fault terminal or cause of external fault input.
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_ _ _ L
Lost Command |
Cause:
- No frequency command is applied to AI terminal.
- Communication command is cut off.
Remedy:
- Check the wiring of AI and frequency reference level.
- In case of a program set to periodically update frequency, check the communication line or operation of master device.
|
EEP / HUt
Parameter save error / Hardware fault |
Cause:
- Hardware fault or First power-on after software upgrade.
Remedy:
- Contact your local LSIS sales representative.
- EEP message occurs when first allowing power after upgrading software due to A/S service. At the moment, turn it off and retry.
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