YASKAWA Varispeed V7 Instruction Manual page 172

Decreasing Motor Speed Fluctuation
Slip Compensation (n002 = 0)
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
(n036), the compensation frequency is added to the output frequency.
Compensation frequency = Motor rated slip (n106)
Constant
No.
n036 Motor Rated Current
n111 Slip Compensation
Gain
n110 Motor No-load Current
n112 Slip Compensation
Time Constant
n106 Motor Rated Slip
* Depends on Inverter capacity.
Note: 1. Slip compensation is not performed under the following condition:
Output frequency < Minimum Output Frequency (n016)
2. Slip compensation is not performed during regeneration.
3. Slip compensation is not performed when the Motor Rated Current
(n036) is set to 0.0 A.
Output current − Motor no-load current (n110)
Motor rated current
(n036)
Slip compensation gain (n111)
Related Constants
Name Unit
0.1 A
0.1
1%
0.1 s
0.1 Hz
7. Programming Features
Motor no-load current (n110)
Setting Range
0% to 150% of Inverter
rated current
0.0 to 2.5
0% to 99% (100%=Mo-
tor Rated Current n036)
0.0 to 25.5 s
When 0.0 s is set, delay
time is 2.0 s
0.0 to 20 Hz
Factory
Setting
*
0.0
*
2.0 s
*
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