LG Electronics C Series manual Troubleshooting & Maintenance

Chapter 13. Troubleshooting & Maintenance

13.Troubleshooting & Maintenance

13.1 Protective functions

WARNING

When a fault occurs, the cause must be corrected before the fault can be cleared. If protective function keeps active, it could lead to reduction in product life and damage to the equipment.

Fault Display and information

Keypad	Protective		Descriptions
display	functions
	Over current		The inverter turns off its output when the output current of the inverter flows more
			than 200% of the inverter rated current.
	Ground	fault	The inverter turns off its output when a ground fault occurs and the ground fault
	current		current is more than the internal setting value of the inverter.
	Inverter		The inverter turns off its output when the output current of the inverter flows more
	Overload		than the rated level (150% for 1 minute).
	Overload trip		The inverter turns off its output if the output current of the inverter flows at 150% of
			the inverter rated current for more than the current limit time (1 min).
	Heat	sink	The inverter turns off its output if the heat sink overheats due to a damaged cooling
			fan or an alien substance in the cooling fan by detecting the temperature of the heat
	overheat
			sink.
	DC	link	The inverter turns off its output when it is time to replace the old DC link capacitor to a
	capacitor		new one.
	overload		The inverter turns off its output when the one or more of the output (U, V, W) phase is
	Output	Phase
	loss		open. The inverter detects the output current to check the phase loss of the output.
			The inverter turns off its output if the DC voltage of the main circuit increases higher
	Over voltage		than 400 V when the motor decelerates. This fault can also occur due to a surge
			voltage generated at the power supply system.
			The inverter turns off its output if the DC voltage is below 180V because insufficient
	Low voltage		torque or overheating of the motor can occur when the input voltage of the inverter
			drops.
	Electronic		The internal electronic thermal of the inverter determines the overheating of the
			motor. If the motor is overloaded the inverter turns off the output. The inverter cannot
	Thermal
			protect the motor when driving a motor having more than 4 poles or multi motors.
	Parameter		This fault message is displayed when user-setting parameters fails to be entered into
	save error		memory.

Keypad	Protective		Descriptions
display	functions
	Inverter		This fault message is displayed when an error occurs in the control circuitry of the
	hardware fault		inverter.
	Communication		This fault message is displayed when the inverter cannot communicate with the
	Error		keypad.
	Cooling	fan	This fault message is displayed when a fault condition occurs in the inverter cooling
	fault		fan.
	Instant cut off		Used for the emergency stop of the inverter. The inverter instantly turns off the output
			when the EST terminal is turned on.

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