LG C Series - Manual (Page 117)

Chapter 13. Troubleshooting & Maintenance
13. Troubleshooting & Maintenance
13.1 Protective functions
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.
WARNING
Fault Display and information
Keypad
display
Protective
functions
Descriptions
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
current
The inverter turns off its output when a ground fault occurs and the ground fault
current is more than the internal setting value of the inverter.
Inverter
Overload
The inverter turns off its output when the output current of the inverter flows more
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
overheat
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
sink.
DC link
capacitor
overload The inverter turns off its output when it is time to replace the old DC link capacitor to a
new one.
Output Phase
loss
The inverter turns off its output when the one or more of the output (U, V, W) phase is
open. The inverter detects the output current to check the phase loss of the output.
Over voltage
The inverter turns off its output if the DC voltage of the main circuit increases higher
than 400 V when the motor decelerates. This fault can also occur due to a surge
voltage generated at the power supply system.
Low voltage
The inverter turns off its output if the DC voltage is below 180V because insufficient
torque or overheating of the motor can occur when the input voltage of the inverter
drops.
Electronic
Thermal
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
protect the motor when driving a motor having more than 4 poles or multi motors.
Parameter
save error
This fault message is displayed when user-setting parameters fails to be entered into
memory.
Keypad
display
Protective
functions
Descriptions
Inverter
hardware fault
This fault message is displayed when an error occurs in the control circuitry of the
inverter.
Communication
Error
This fault message is displayed when the inverter cannot communicate with the
keypad.
Cooling fan
fault
This fault message is displayed when a fault condition occurs in the inverter cooling
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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