Protective Functions; Fault Remedy - LG SV-iC5 Series Instruction Manual

13.2

Fault Remedy

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