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13. Troubleshooting & Maintenance
13-3 SV-iC5
13.2 Fault Remedy
Protective
functions
Cause Remedy
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
2
of the load.
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.
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.
Ground fault
current
Ground fault has occurred at the output
wiring of the inverter
The insulation of the motor is damaged due
to heat.
Check the wiring of the output terminal.
Replace the motor.
Inverter
overload
Overload trip
Load is greater than the inverter rating.
Inverter capacity is incorrectly selected.
Torque boost scale is set too large.
Upgrade the capacity of motor and inverter
or reduce the load weight.
Select correct inverter capacity.
Reduce torque boost scale.
Heat sink
overheat
Cooling system has faults.
An old cooling fan is not replaced with a new
one.
Ambient temperature is too high.
Check for alien substances clogged in the
heat sink.
Replace the old cooling fan with a new one.
Keep ambient temperature under 40°C.
Output Phase
loss
Faulty contact of magnetic switch at output
Faulty output wiring
Make connection of magnetic switch at
output of the inverter securely.
Check output wiring.
Cooling fan
fault
An alien substance is clogged in a ventilating
slot.
Inverter has been in use without changing a
cooling fan.
Check the ventilating slot and remove the
clogged substances.
Replace the cooling fan.
Over voltage
Decel time is too short compared to the GD
2
of the load.
Regenerative load is at the inverter output.
Line voltage is too high.
Increase the Decel time.
Use Dynamic Brake Unit.
Check whether line voltage exceeds its
rating.
Low 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
line).
Faulty magnetic switch at the input side of
the inverter.
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.
Electronic
thermal
Motor has overheated.
Load is greater than inverter rating.
ETH level is set too low.
Inverter capacity is incorrectly selected.
Inverter has been operated at low speed for
too long.
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.