80
Decreasing Motor Speed Fluctuation
Slip Compensation
As the load becomes larger, the motor speed is reduced and the motor
slip value is increased. The slip compensating function controls the
motor speed at a constant value even if the load varies.
When the Inverter output current is equal to the Motor Rated Current
(n32), the compensation frequency is added to the output frequency.
Related Constants
* Depends on Inverter capacity.
Note: 1. Slip compensation is not performed under the following condition:
Output frequency
<
Minimum Output Frequency (n14)
2. Slip compensation is not performed during regeneration.
3. Slip compensation is not performed when the Motor Rated Current
(n32) is set to 0.0 A.
Constant
No.
Name
Unit
Setting Range
Initial
Setting
n32
Motor Rated Current
0.1 A
0% to 120% of Inverter
rated current
*
n64
Motor Rated Slip
0.1 Hz
0.0 to 20 Hz
*
n65
Motor No-load Current
1%
0% to 99% (100%=Mo-
tor Rated Current n32)
*
n66
Slip Compensation
Gain
0.1
0.0 to 2.5
0.0
n67
Slip Compensation
Time Constant
0.1 s
0.0 to 25.5 s
When 0.0 s is set, delay
time is 2.0 s.
2.0 s
Output current
−
Motor no-load current (n65)
Motor rated current (n32)
−
Motor no-load current (n65)
Slip compensation gain (n66)
Compensation frequency = Motor rated slip (n64)
×
×