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Appendix 2 Alarm Code List
Alarm Code
Code Screen Display Cause Troubleshooting
OV3
Over-voltage
during
deceleration
Over-voltage between Terminal
P and Terminal N
Please refer to OV1, OV2.
THT
The IGBT
module is
overheating
The IGBT module thermal
accumulating relay acts
Avoid the inverter long timely
operating under overload
condition
THN
Motor
overheating
The electronic thermal relay
operates
1. Check whether the set
value of the P.9
is correct
or not (the set value should
comply the actual motor)
2. Reduce load
OHT
The external
thermal relay
operates.
The external thermal relay
operates
1. Check the capacity of the
external thermal relay and
the motor for matching.
2. Reduce the load
OPT
Peripheral
devices are
abnormal
1. Abnormal communication.
The maximum
communication retry
number is violated.
2. Interrupted communication.
The maximum
communication check time
interval is violated.
Correctly set the
communication parameters
EEP
Memory is
abnormal
The memory ROM fails Send it back to the factory.
CPU
CPU error
External electromagnetic
disturbance is too strong
Improve external disturbance
OLS
Stall prevention
protection
The load of the motor is too
heavy.
1. Reduce the load of the
motor.
2. Increase the value of P.22
.
SCP
Over-current
The output current is two times
larger than the rated current of
the inverter.
Check Terminals U/T1, V/T2
and W/T3 for short circuit.
(such as the motor wiring)
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