4-3
Error Causes
Action to Be Taken
•
Power capacity is too small.
•
Voltage drop due to wiring resistance.
•
A motor of large capacity connected to the same power
system has been started.
•
Defective electromagnetic contractor.
•
Check the source voltage and wiring.
•
Check the power capacity and power system.
•
Extremely rapid accel.
•
Short-circuit or ground- fault at the inverter output side.
•
Motor of a capacity greater than the inverter rating
has been started.
•
High-speed motor and pulse motor has been started.
•
Extend the accel. time.
•
Check the load wiring.
•
Motor dielectric strength is insufficient.
•
Load wiring is not proper.
•
Check the motor wiring impedance and the load
wiring.
•
Insufficient deceleration time.
•
High input voltage compared to motor rated voltage.
•
Extend the accel. time.
•
Use a braking resistor.
•
Defective cooling fan.
•
Ambient temperature rise
•
Clogged filter.
•
Check for the fan, filter and the ambient
temperature.
•
Overload, low speed operation or extended accel. time.
•
Improper V-f characteristic setting
•
Measure the temperature rise of the motor.
•
Decrease the output load.
•
Set proper V/f characteristic.
•
Improper rated current (Cn-09) setting
•
Set proper V/f characteristic.
•
Set proper rated current (Cn-09)
•
If inverter is reset repetitively before fault
removed, the inverter may be damaged.
•
Machine errors or overload
•
Check the use of the machine.
•
Set a higher protection level (Cn-32).
•
Fault input of external signal
e
,
g
,
h
,
i
and
j
.
•
Identify the fault signal using Un-11.
•
Disturbance of external noise
•
Excessive impact or vibration
•
Reset NVRAM by running Sn-03.
•
Replace the control board if the fault can’t be
cleared.
•
Improper setting of ASR parameter or over-speed
protection level.
•
Check the parameters of ASR and the
protection level.
•
The PG wiring is not properly connected or open-
circuit.
•
Check the PG wiring.
•
Improper setting of ASR parameter or speed
deviation level.
•
Check parameters of ASR and speed deviation
level.
•
External noise
•
Excessive vibration or impact Communication wire
•
Not properly contacted
•
Check the parameter setting, including Sn-01, Sn-02.
•
Check if the comm. wire is not properly contacted.
•
Restart, if fault remains, please contact to us.
