If Motor Deceleration Is Slow; Motor Torque Is Insufficient; If The Motor Overheats - Omron VARISPEED L7 Manual

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 fault but the torque is 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 lengthen the decel-
eration time. Check the L7-

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. Either
reduce the load or increase the acceleration/deceleration times. Also consider increasing the motor size.
7
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 tempera-
ture is exceeded. Lower the motor's ambient temperature to an acceptable value.
Auto-tuning has not been performed for vector control
The Vector control performance may not be optimal, if auto-tuning has not been performed. Perform auto-tun-
ing, or set the motor parameters manually.
For induction motors alternatively the V/f control mode can be used.
20
7-
parameters to be sure that the torque limit values are suitable.