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12-3
12.2 Fault remedy
Keypad
display
Cause
Remedy
Overcurrent
Caution
When an overcurrent fault occurs, operation must be started after the cause is
removed to avoid damage to IGBT inside the inverter.
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).
Check output wiring.
Check the mechanical brake.
Overcurrent2
Short occurs between up and down of
IGBT
Inverter output short occurs.
Accel/Decel time is very fast comparing
with GD
2
Check the IGBT.
Check output Wring.
Increase the Accel/Decel time.
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
Load is greater than the inverter rating.
Torque boost scale is set too large.
Upgrade the capacity of motor and
inverter or reduce the load weight.
Reduce torque boost scale.
Overload trip
Inverter
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
50
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.
For Service Call
800-848-2504
For Service Call
800-848-2504
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