N3 Drive Operations Manual
Error Display Codes
Cont.
86
Cont.
OC-D
Overcurrent at
deceleration
The preset deceleration time is
too short.
Set a longer deceleration time.
(Parameter b0008)
OC-A
Overcurrent at
acceleration
1. Acceleration time is set too
short.
2. The capacity of the
motor exceeds the capacity
of the inverter.
3. Short circuit between the
motor winding and the
frame.
4. Short circuit between
motor wiring and ground.
5. IGBT module is damaged.
1. Set a longer acceleration time.
(Parameter b0007)
2. Replace inverter with the same
or greater capacity as that of
the motor.
3. Check the motor.
4. Check the wiring.
5. Replace the IGBT module.
OC-C
Overcurrent during
run
1. Transient load change.
2. Transient power change.
1 .Increase the capacity of the
inverter.
2. Repeat parameter auto
tuning. (A006 = 1)
3. Reduce stator resistance
(A168) if the above actions are
ineffective.
OV-C
Overvoltage
during operation/
deceleration
1. Deceleration time setting too
short or excessive load
inertia.
2. Input voltage varies widely.
(fluctuates)
1. Set a longer deceleration time.
2. Add a braking resistor or
braking unit.
3. Add a reactor to the input line
side.
4. Increase inverter capacity.
Err4
Illegal interrupt
of CPU
Outside noise interference.
Return unit if this is a frequent
occurrence.
OVSP
Over speed during
operation
1. Motor load excessive or
inverter capacity too small.
2. Motor parameter error.
(vector mode)
3. The gain is excessive in
vector mode.
4.Current detection circuit
fault.
1. Increase acceleration /
deceleration time..
(Parameters b007 / b008)
2. Check and correct motor
parameter.
3.Change stator Resistance
gain and Rotor resistance
gain. ( Parameters A168 /
A169), (suggest
Incremental decrease of
50-100)
4. Return unit.
