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Decreasing Motor Speed Fluctuation
Slip compensation
As the load becomes larger, motor speed is reduced and motor slip value is
increased. The slip compensating function controls the motor speed at a
constant value even if the load varies.
When inverter output current is equal to the motor rated current (n32), the
compensation frequency is added to the output frequency.
Compensation frequency = Motor rated slip (n64)
Constants
Constants
Name
No.
Motor rated current
n32
n64
Motor rated slip
Motor no-load
n65
current
Slip compensation
n66
gain
Slip compensation
n67
time constant
* Differs depending on inverter capacity.
Notes : 1. Slip compensation is not performed in the following condition:
Output frequency < min. output frequency (n14)
2. Slip compensation is not performed during regeneration.
3. Slip compensation is not performed when motor rated current (n32) is set to 0.0A.
Output current – Motor no-load current (n65)
Motor rated current (n32) – Motor no-load current (n65)
Slip compensation gain (n66)
Unit
0.1A 0 to 120% of inverter rated current
0.1Hz 0.0 to 20Hz
0 to 99% (100%=Motor rated current
1%
n32)
0.1
0.0 to 2.5
0.0 to 25.5s
0.1s
When 0.0s is set, delay time becomes 2.0s
Setting range
Initial
Setting
*
*
*
0.0
2.0s
71
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