YASKAWA GA800 Technical Reference page 779

If you increase the value of C3-21 [Motor 2 Slip Compensation Gain] and the motor speed is slow, use this parameter.
The drive uses this parameter when the slip is at the upper limit of slip compensation. Make sure that you measure the
motor speed when you increase this parameter value. Set this parameter to make the frequency reference and the slip
compensation limit less than the permitted range of the machine.
The slip compensation limit is constant in the constant torque range (frequency reference ≤ E3-06 [Motor 2 Base
Frequency]). In the constant power range where the frequency reference > E3-06, the slip compensation limit
increases with the C3-23 value and the output frequency as shown in
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C3-24: Motor 2 Slip Comp during Regen
No.
Name
(Hex.)
C3-24 Motor 2 Slip Comp during
Regen
(0243)
If you apply a regenerative load when the slip compensation function during regeneration is active, the quantity of
regeneration can increase immediately. In this condition, it is necessary to use a dynamic braking option (braking
resistor or braking resistor unit).
0 : Disabled
The drive will not do Slip compensation during regeneration.
The load and operation status (regenerative operation) can cause the motor speed to be higher or lower than the
frequency reference.
1 : Enabled Above 6Hz
Slip compensation function is enabled during regeneration. Slip compensation is disabled at output frequencies of 6
Hz or less.
2 : Enabled Above Defined Range
The drive uses E2-02 [Motor Rated Slip] to automatically calculate the frequency range where it will disable slip
compensation function during regenerative operation.
Slip compensation is enabled at frequencies as low as 2 Hz.
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C3-28: Adaptive Slip Control Mode
No.
Name
(Hex.)
C3-28 Adaptive Slip Control Mode
(1B5B)
Expert
0 : Normal
1 : Advanced
Note:
Set C3-28 = 0 for better torque precision. If the torque precision does is not better, set C3-28 = 1 and increase the value of n4-65 [Flux
Estimate Response@High Freq] or n4-66 [Flux Estimate Response @Low Freq] in 0.1-unit increments. Then, you must do Rotational Auto-
Tuning.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Figure 12.52 Motor 2 Slip Compensation Limit
V/f CL-V/f OLV CLV AOLV
Sets the slip compensation during regenerative operation function for motor 2.
V/f CL-V/f OLV CLV AOLV
Sets the slip compensation function mode.
Figure 12.52.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.4 C: Tuning
Default
(Range)
0
(0 - 2)
Default
(Range)
0
(0, 1)
12
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