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8.2 Fault Remedy
Protective
Function
1) Acceleration/Deceleration time is too short compared to
the GD²of the load.
2) Load is larger than the inverter rating.
3) Inverter turns output on when the motor is free running.
Over Current
4) Output short or ground fault has occurred.
Protection
5) Mechanical brake of the motor is operating too fast .
6) Components of the main circuit have overheated due
to a faulty cooling fan.
Ground Current
1) Ground fault has occurred at the output wiring of inverter.
Protection
2) The insulation of the motor is damaged due to heat .
1) Acceleration time is too short compared to the GD²of
Over Voltage
load.
Protection
2) Regenerative load at the output
3) Line voltage high
Current Limit
1) Load is larger than the inverter rating.
Protection
2) Incorrect inverter capacity selected.
(Overload
3) Set incorrect V/F pattern.
Protection)
1) Damaged due to over use of over current protection.
Fuse Damage
2) Damaged due to instant deceleration when motor is at an
excessive excitation status.
1) Cooling fan damaged or an alien substance inserted.
Heat Sink
2) Cooling system has faults.
Overheat
3) Ambient temperature high.
1) Motor has overheated.
2) Load is larger than inverter rating.
3) ETH level too low.
Electronic
4) Incorrect inverter capacity selected.
Thermal
5) Set incorrect V/F pattern.
6) Operated too long at low speeds.
External fault A External fault has occurred.
External fault B External fault has occurred.
1) Line voltage low.
2) Load larger than line capacity is connected to line.
Low Voltage
(welding machine, motor with high starting current
Protection
connected to the commercial line)
3) Faulty magnetic switch at the input side of the inverter
1) Short has occurred between the upper and lower IGBT.
2) Short has occurred at the output of the inverter.
Over Current 2
3) Acceleration/Deceleration time is too short compared to
the GD²of load.
Output Phase
1) Faulty contact of magnetic switch at output
Open
2) Faulty output wiring
1) Encoder wiring error (A and B wiring switched)
Overspeed
2) Encoder parameter setting is incorrect.
3) Sub-B board or Encoder error
1) Wdog error (CPU fault)
H/W Fault
2) EEP error (memory fault)
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Chapter 8 - Troubleshooting & Maintenance
Cause
183
Remedy
1) Increase Accel/Decel time.
2) Increase inverter capacity .
3) Operate after motor has stopped.
4) Check output wiring.
5) Check mechanical brake operation.
6) Check cooling fan.
(Caution) Operating inverter prior to correcting fault
may damage the IGBT.
1) Investigate the output wiring of inverter.
2) Exchange motor.
1) Increase deceleration time.
2) Use regenerative resistor option.
3) Check line voltage.
1) Increase capacity of motor and inverter.
2) Select correct inverter capacity .
3) Select correct V/F pattern.
Exchange the f u se.
(Caution) The IGBT receives damages on many
occasions when Fuse Open Trip occurs.
1) Exchange cooling fans and/or eliminate alien
substance.
2) Check for alien substances in the heat sink.
3) Keep ambient temperature under 40 ℃.
1) Reduce load and/or running duty .
2) Increase inverter capacity .
3) Adjust ETH level to an appropriate level.
4) Select correct inverter capacity .
5) Select correct V/F pattern.
6) Install a cooling fan with a separate power supply.
Eliminate fault at circuit connected to external fault
terminal or cause of external fault input.
Eliminate fault at circuit connected to external fault
terminal or cause of external fault input.
1) Check line voltage.
2) Increase line capacity .
3) Exchange magnetic switch.
1) Check IGBT.
2) Check output wiring of inverter.
3) Increase acceleration t i me.
1) Check magnetic switch at output of inverter.
2) Check output wiring.
1) Check for the wiring of inverter and encoder
2) Check for parameter setting of EXT-14, 15, and 16.
3) Exchange inverter and encoder for a new one.
Exchange inverter.
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Table of Contents
Troubleshooting
