Contents

Troubleshooting
If Motor Deceleration is Slow
The following causes are possible:
•The deceleration time is too long
The following causes are possible:
The deceleration time setting is too long.
Check the deceleration time setting (parameters C1-02, C1-04, C1-06, and C1-08).
Motor torque is insufficient.
If the parameters are correct and there is no overvoltage fault, then the motor's power may be insufficient.
Consider increasing the motor and Inverter capacity.
The torque limit has been reached.
When a torque limit is reached (L7-01 to L7-04), the motor torque will be limited. This can cause the deceleration
time to be extended. Check to be sure that the value set for the torque limit is suitable.
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If the Motor Overheats
The following causes are possible:
•The load is too large.
If the motor load is too large and the torque exceeds the motor’s rated torque, the motor may overheat. Reduce
the loads by either reducing the load or increasing the acceleration/deceleration times. Also consider increasing
the motor size.
•The ambient temperature is too high.
The motor rating is determined by a particular ambient operating temperature range. The motor will overheat
if it is run continuously at the rated torque in an environment where the maximum ambient operating temperature
is exceeded. Lower the motor's ambient temperature to be within its acceptable range.
•Auto-tuning has not been performed for vector control
Vector control may not perform efficiently if auto-tuning has not been performed. Perform auto-tuning, or set
the motor parameters through hand calculations. Alternatively, change the Control Mode Selection (A1-02) to
V/f Control (0 or 1).
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