Troubleshooting Faults
When a fault or warning occurs, refer to the following table for possible causes and remedies.
The load is greater than the
motor’s rated capacity.
Replace the motor and/or inverter with larger
models.
Pr.21 value for the overload trip
level is too low.
Increase the value for the overload trip level.
There is a motor-load connection
problem.
Check connections, measure amps to motor.
Inverter/motor too large for application. Replace the
motor and/or inverter with models with lower
capacity.
Pr.29, Pr.30 underload level is
less than the system’s minimum
load.
Reduce the value for the underload levels.
Acc/Dec time is too short,
compared to load inertia (GD2).
The load is greater than the
inverter rated capacity.
Replace the inverter with a larger model.
The inverter supplied an output
while the motor was tuning.
Operate the inverter after the motor has stopped or
use the speed search function (Cn.70).
The mechanical brake of the
motor is operating too fast.
Check the mechanical brake.
A ground fault has occurred in
the inverter output wiring.
The motor insulation is damaged.
Deceleration time is too short for
the load inertia (GD2).
Increase the deceleration time.
The input voltage is too high.
Check supply voltage. Check DC Link voltage.
Ground fault in the output wiring.
The motor insulation is damaged.
The input voltage is too low.
Check supply voltage. Check DC Link voltage.
Other equipment connected to
the same power source (e.g., a
welder, direct motor connection,
etc.).
Increase source power capacity.
The input contactor connecting
the power source has a faulty
connection.
Check/Replace the contactor.
The input voltage has decreased
during operation.
Determine if the input voltage is lower than the
specified value.
An input open-phase has
occurred.
The input contactor connecting
the power source has a faulty
connection.
Check/Replace the contactor.
A ground fault has occurred in
the inverter output wiring.
The motor insulation is damaged.
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