Appendix 2 Alarm code list
APPENDIX 394
7.2 Appendix 2 Alarm code list
Code
Screen display
Cause
Troubleshooting
ERROR
1.Low input voltage
2.The reset function “RES” is on
3.Bad connection between the
control panel and main body
4.Internal circuit malfunction
5. CPU error
6.Abnormal insulation of load to
ground
1.Use a better power supply
2.Shut off “RES”
3.Ensure the keypad is connected firmly
4.Replace the inverter.
5.Restart the inverter
6.Check the insulation of the motor cable and the
three-phase winding of the motor
OC0
Over-current
at startup
The output current is two times
larger than the rated current of
the inverter or the motor is short.
1.Check whether the insulation layer of the motor power
line is damaged
2.Check whether a contractor is used in series on the
output side of the inverter, the contactor’s contacts will
arc and leads to inverter detects overcurrent (please
avoid this usage, please refer to manual for wiring
details)
3.The control circuit of the inverter is interfered with
external noise (for example: the electromagnetic
contractor frequently switches to power supply load), it
is recommended to add magnetic rings on output line of
the electromagnetic contractor, and add magnetic ring
with 2~3 windings on control terminal input signal on
inverter
4.If alarm OC0 when the motor is disconnected, it needs
to be sent to the factory for inspection
OC1
Over-current
during
acceleration
1.It is recommended to increase the acceleration time
P.7 (01-06)
2.Check the insulation condition of the motor power line
(for example: the insulation of the three-phase motor is
short to ground, the power line is short-circuited, or
short circuit between power line and the metal part of
the electric cabinet)
3.Check whether the base frequency parameter P.3
(01-03) of the inverter is the same with the rated
frequency of the motor
OC2
Over-current
at constant
speed
1.It is recommended to reduce the load to eliminate
motor stall and transmission mechanism jam
2.Check the insulation condition of the motor power line
(for example: the insulation of the three-phase motor is
short to ground, the power line is short-circuited, or
short circuit between power line and the metal part of
the electric cabinet)
3.Check whether the selection of the inverter power is too
low
