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Appendix 2 Alarm Code List
Alarm Code
Code Screen Display Cause Troubleshooting
ERR
1. Under-voltage for
power supply
2. The RES is ‘on’
3. Bad connection
between the operation
panel and main
machine
4. Internal circuit
malfunction
5. Wrong operation of
CPU
1. Provide a normal power supply
2. Shut off RES
3. Ensure firm connection between
the operation panel and the main
machine
4. Replace the inverter
5. Restart the inverter
OC1
Over-current
when stop
The inverter may be disturbed. Please
restart the inverter. If the alarm
repeated, please send the inverter back
to the factory.
OC1
Over-current
during
acceleration
OC2
Over-current at
constant speed
OC3
Over-current
during
deceleration
The output current is two
times larger than the rated
current of the inverter.
1. In case the time for acceleration or
deceleration is too short, please
prolong it.
2. Avoid abrupt increase of load.
3. Check Terminals U/T1, V/T2 and
W/T3 for short circuit.
OV0
Over- voltage
when stop
Check whether the power supply is
normal or abnormal.
OV1
Over-voltage
during
acceleration
OV2
Over-voltage at
constant speed
Over-voltage between
Terminal P and Terminal
N
1. In case the time for acceleration or
deceleration is too short, please
prolong it.
2. Check the brake resistor between
terminal +/P and PR for loose
connection.
3. Check whether the values of P.30
and P.70 are right or not.
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