OC
Overcurrent |
Cause:
- Accel/Decel time is too short compared to the GD² of the load.
- 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 H22 (Speed search) in Function group 2.
- Check output wiring.
- Check the mechanical brake.
|
GF
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.
|
IOL
Inverter Overload |
Cause:
- Load is greater than the inverter rating.
- Inverter capacity is incorrectly selected.
- Torque boost scale is set too large.
Remedy:
- Upgrade the capacity of motor and inverter or reduce the load weight.
- Select correct inverter capacity.
- Reduce torque boost scale.
|
OLT
Overload trip |
Cause:
The inverter turns off its output if the output current flows at 150% of rated current for more than the current limit time (1 min).
Remedy:
- Upgrade the capacity of motor and inverter or reduce the load weight.
- Select correct inverter capacity.
|
OHT
Heat sink overheat |
Cause:
- Cooling system has faults.
- An old cooling fan is not replaced with a new one.
- Ambient temperature is too high.
Remedy:
- Check for alien substances clogged in the heat sink.
- Replace the old cooling fan with a new one.
- Keep ambient temperature under 40°C.
|
COL
DC link capacitor overload |
Cause:
The inverter has determined it is time to replace the old DC link capacitor.
Remedy:
- Replace the DC link capacitor with a new one.
|
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.
|
OVT
Over voltage |
Cause:
- Decel time is too short compared to the GD² of the load.
- Regenerative load is at the inverter output.
- Line voltage is too high.
Remedy:
- Increase the Decel time.
- Use Dynamic Brake Unit.
- Check whether line voltage exceeds its rating.
|
LVT
Low voltage |
Cause:
- Line voltage is low.
- Load larger than line capacity is connected to line (ex: welding machine, motor with high starting current).
- 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.
|
ETH
Electronic Thermal |
Cause:
- Motor has overheated.
- Load is greater than inverter rating.
- ETH level is set too low.
- Inverter capacity is incorrectly selected.
- Inverter has been operated at low speed for too long.
Remedy:
- Reduce load weight and operating duty.
- Change inverter with higher capacity.
- Adjust ETH level to an appropriate level.
- Select correct inverter capacity.
- Install a cooling fan with a separate power supply.
|
EEP
Parameter save error |
Cause:
User-setting parameters failed to be entered into memory.
Remedy:
- Contact your local LSIS sales representative.
|
H/W
Inverter hardware fault |
Cause:
An error occurred in the control circuitry of the inverter.
Remedy:
- Contact your local LSIS sales representative.
|
Err
Communication Error |
Cause:
The inverter cannot communicate with the keypad.
Remedy:
- Contact your local LSIS sales representative.
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FAN
Cooling fan fault |
Cause:
- An alien substance is clogged in a ventilating slot.
- Inverter has been in use without changing a cooling fan.
Remedy:
- Check the ventilating slot and remove the clogged substances.
- Replace the cooling fan.
|
EST
Instant cut off |
Cause:
Used for emergency stop. The EST terminal has been turned on.
Remedy:
- Turn off the EST terminal to return to regular operation.
- Caution: The inverter starts regular operation if EST is turned off while FX or RX terminal is ON.
|
EtA
External fault A contact input |
Cause:
The terminal set to “18 (External fault-A)” in I20-I24 group is ON.
Remedy:
- Eliminate the cause of fault at circuit connected to external fault terminal or cause of external fault input.
|
EtB
External fault B contact input |
Cause:
The terminal set to “19 (External fault-B)” in I20-I24 group is ON.
Remedy:
- Eliminate the cause of fault at circuit connected to external fault terminal or cause of external fault input.
|
–L
Operating method lost |
Cause:
No frequency command is applied to V1 and I when operation is set via Analog input.
Remedy:
- Check the wiring of V1 and I and frequency reference level.
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