Appendix 2 Alarm code list
Appendix 395
Code
Screen display
Cause
Troubleshooting
OC3
Over-current
during
deceleration
The output current is two times
larger than the rated current of
the inverter or the motor is short
1.It is recommended to increase the deceleration time
P.8 (01-07)
2.It is recommended to set the base voltage parameter
P.19 (01-04) equal to power supply voltage
3.It is recommended to add braking unit and braking
resistor
OV0
Over-voltage
at startup
The voltage between terminals
(+ / P)-(-/ N) is too high or the
motor leaks to ground;
The external power supply line
has large power equipment start
and stop affecting the power grid
surge
1.Check whether the input power voltage is abnormal
2.Check whether the motor is grounded (if so, it is
recommended to remove the ground wire after turning
off the power)
3.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)
OV1
Over-voltage
during
acceleration
1.Check whether the input power voltage is abnormal
2.Check whether the motor is grounded (if so, it is
recommended to remove the ground wire after turning
off the power)
3.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)
OV2
Over-voltage at
constant speed
1.Check whether the input power voltage is abnormal
2.Check whether the motor is grounded (if so, it is
recommended to remove the ground wire after turning
off the power)
3.It is recommended to add an input AC reactor at the
input end of the inverter
4.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)
OV3
Over-voltage
during
deceleration
1.It is recommended to increase the deceleration time
P.8 (01-07)
2.It is recommended to add braking unit and braking
resistor
3.Set the base voltage parameter P.19 (01-04) to 9999
4 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)
