Chapter 5 Trouble shooting and maintenance
5-2
2. Errors which can be reset manually and automatically
Display Error Cause Remedy
Over-current at
start-up
1. The motor winding and
frame short circuit
2. Motor cable ground fault
3. Power module is damaged
1. Check the motor
2. Check the motor wiring
3. Contact your supplier
Over-current at
deceleration
Deceleration time is too short
OCS
Set a longer deceleration time
OCD
Over-current at
acceleration
1. Acceleration time is too short
2. The capacity of the motor
higher than the capacity of the
inverter
3. Short circuit between the
motor winding and frame.
4.Short circuit between motor
wiring and earth
5. IGBT module is damaged
1. Set a longer acceleration time
2. Replace inverter with the
same capacit
as that of the
motor
3. Check the motor windings
4. Check the motor wiring
5. Contact your supplier
OCA
Over-current
during running
1. Transient load change
2. Transient power change
1. Increase inverter capacity
OCC
Over voltage
during
operation/
deceleration
1. Deceleration time setting is too
short or large load inertia
2. Power voltage varies widely
1. Set a longer deceleration time
2. Add a brake resistor & brake
module
3. Use a reactor on the power
input side
4. Increase inverter capacity
OVC
High heat sink
temperature
during
operation
1. Heavy load
2. Ambient temperature too high
or poor ventilation
1. Check if there are any
problems with the load
2. Increase inverter capacity
3. Improve ventilation
conditions
4. Check inverter cooling fan
is operating
5. Check the setting value of
parameter b87
OHC
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