LG Electronics SV-iC5 Series manual Avoid damage to Igbt inside the inverter

13. Troubleshooting & Maintenance

13.2Fault Remedy

Protective	Cause			Remedy
functions
	☞ Caution:
	When an overcurrent fault occurs, operation must be started after the cause is removed to
Overcurrent	avoid damage to IGBT inside the inverter.
	Accel/Decel time is too short compared to	Increase the Accel/Decel time.
	the GD2 of the load.	Replace	the	inverter	with	appropriate
	Load is greater than the inverter rating
		capacity.
	Inverter output is issued when the motor is	Resume operation after stopping the motor
	free running.	or use H22 (Speed search) in Function group 2.
	Output short circuit or ground fault has	Check output wiring.
	occurred.
	Mechanical brake of the motor is operating	Check the mechanical brake.
	too fast.
	Ground fault has occurred at the output	Check the wiring of the output terminal.
	wiring of the inverter
Ground fault	The insulation of the motor is damaged due	Replace the motor.
	to heat.
current
	Load is greater than the inverter rating.
		Upgrade the capacity of motor and inverter
	Inverter capacity is incorrectly selected.	or reduce the load weight.
Inverter		Select correct inverter capacity.
overload	Torque boost scale is set too large.
		Reduce torque boost scale.
Overload trip	Cooling system has faults.
		Check for alien substances clogged in the
	An old cooling fan is not replaced with a new	heat sink.
		Replace the old cooling fan with a new one.
Heat sink	one.
overheat	Ambient temperature is too high.	Keep ambient temperature under 40°C.
	Faulty contact of magnetic switch at output
		Make connection of magnetic switch at
	Faulty output wiring	output of the inverter securely.
Output Phase		Check output wiring.
loss	An alien substance is clogged in a ventilating
		Check the ventilating slot and remove the
	slot.	clogged substances.
	Inverter has been in use without changing a
Cooling fan		Replace the cooling fan.
	cooling fan.
fault
	Decel time is too short compared to the GD2
		Increase the Decel time.
	of the load.
	Regenerative load is at the inverter output.	Use Dynamic Brake Unit.
Over voltage	Line voltage is too high.
		Check whether line voltage exceeds its
	Line voltage is low.	rating.
		Check whether line voltage is below its
	Load larger than line capacity is connected	rating.
		Check the incoming AC line. Adjust the line
	to line (ex: welding machine, motor with high
		capacity corresponding to the load.
Low voltage	starting current connected to the commercial
	line).
	Faulty magnetic switch at the input side of	Change a magnetic switch.
	the inverter.
	Motor has overheated.	Reduce load weight and operating duty.
	Load is greater than inverter rating.	Change inverter with higher capacity.
	ETH level is set too low.
		Adjust ETH level to an appropriate level.
Electronic	Inverter capacity is incorrectly selected.
	Inverter has been operated at low speed for	Select correct inverter capacity.
thermal	too long.	Install a cooling fan with a separate power
		supply.
	13-3			SV-iC5