LG Electronics C Series manual Fault Remedy, Avoid damage to Igbt inside the inverter

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

119