2. Troubleshooting
31
The motor deceleration time is too long even with Dynamic Braking (DB) resistor connected.
The deceleration time is set too long.
Change the setting accordingly.
The motor torque is insufficient.
If motor parameters are normal, it is likely to be a motor
capacity fault. Replace the motor with a model with
increased capacity.
The load is higher than the internal torque limit
determined by the rated current of the inverter.
Replace the inverter with a model with increased
capacity.
Operation is difficult in under load applications.
The carrier frequency is too high.
Reduce the carrier frequency.
Over-excitation has occurred due to an
inaccurate V/F setting at low speed.
Reduce the torque boost value to avoid over-excitation.
While the inverter is in operation, a control unit malfunctions or noise occurs.
Noise occurs due to switching inside the
inverter.
Change the carrier frequency to the minimum value in
H39
Install a micro surge filter in the inverter output.
When the inverter is operating, the earth leakage breaker is activated.
An earth leakage breaker will interrupt the
supply if current flows to ground during
inverter operation.
Connect the inverter to a ground terminal.
Check that the ground resistance is less than 100Ω for
200V inverters and less than 10Ω for 400V inverters.
Check the capacity of the earth leakage breaker and
make the appropriate connection, based on the rated
current of the inverter.
Lower the carrier frequency in H39
Make the cable length between the inverter and the
motor as short as possible.
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