IMO iDrive Instruction Manual page 71

2. Errors which can be reset manually and automatically
Display Error
OCS
Over-current at
start-up
OCD
Over-current at
deceleration
OCA
Over-current at
acceleration
Over-current
OCC
during running
Over voltage
OVC
during
operation/
deceleration
OHC
High heat sink
temperature
during
operation
Cause
1. The motor winding and
frame short circuit
2. Motor cable ground fault
3. Power module is damaged
Deceleration time is too short
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. Transient load change
2. Transient power change
1. Deceleration time setting is too
short or large load inertia
2. Power voltage varies widely
1. Heavy load
2. Ambient temperature too high
or poor ventilation
5-2
Chapter 5 Trouble shooting and maintenance
1. Check the motor
2. Check the motor wiring
3. Contact your supplier
Set a longer deceleration time
1. Set a longer acceleration time
2. Replace inverter with the
same capacity as that of the
motor
3. Check the motor windings
4. Check the motor wiring
5. Contact your supplier
1. Increase inverter capacity
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
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
Remedy