Chapter 5 Trouble shooting and maintenance
5-2
2. Errors which can be recovered both manually and automatically
Display Error
Cause
Corrective
Action
Over current
at start
1.Motor winding and
frame short circuit
2.Motor and ground short circuit
3.Power module is damaged
1. Check the motor
2. Check the wiring
3. Replace the power module
Over-current at
deceleration
The preset deceleration time is
too short
Set a longer deceleration time
Over-current at
acceleration
1. Acceleration time is too short
2. The capacity of the motor is
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 the 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
Over-current
during run
1. Transient load change
2. Transient power change
Increase inverter capacity
Over voltage
during
operation/
deceleration
1. Deceleration time setting is too
short or excessive load inertia
2. Power voltage varies widely
1. Set a longer deceleration time
2. Add a braking resistor or
braking unit
3. Add a reactor at the input
line side
4. Increase inverter capacity
High heat sink
temperature
during
operation
1. Heavy load
2. Ambient temperature too high
or bad ventilation
1. Check if there are any
problems with the load
2. Increase inverter capacity
3. Improve ventilation
conditions
4. Inspect the setting value of
parameter C13
Communication
time-out
detection
1.
C54 communication time-out
detection time is too short.
2.
Inverter communication is
broke.
3.
Inverter can not receive the
correct Modbus data within
detection time.
1.
Increase C54 communication
time-out detection time.
2.
Keep the inverter
communication.
3.
Check the received Modbus
data is correct from Master.
Over Speed
The acceleration or deceleration
time is too short.
Set a longer acceleration or
deceleration time.
OCS
OCD
OCA
OCC
OVC
OHC
COT
OVP