Parameter Details
12
12.4 C: Tuning
YASKAWA SIEPC71061753C GA500 Technical Manual 555
■ C3-23: Motor 2 Slip Compensation Limit
No.
(Hex.)
Name Description
Default
(Range)
C3-23
(0242)
Motor 2 Slip Compensation
Limit
Sets the upper limit for the slip compensation function as a percentage of the motor 2 rated slip.
200%
(0 - 250%)
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 Figure 12.43.
Figure 12.43 Motor 2 Slip Compensation Limit
■ C3-24: Motor 2 Slip Comp during Regen
No.
(Hex.)
Name Description
Default
(Range)
C3-24
(0243)
Motor 2 Slip Comp during
Regen
Sets the slip compensation during regenerative operation function for motor 2.
0
(0 - 2)
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.
■ C3-29: Slip Compensation Gain @ Low Spd
No.
(Hex.)
Name Description
Default
(Range)
C3-29
(1B5D)
Expert
Slip Compensation Gain @
Low Spd
Sets the gain for the slip compensation function in the low speed range. Usually it is not necessary
to change this setting.
0.0
(0.0 - 2.5)
Adjust this parameter as follows if necessary:
• If the motor speed is slower than the frequency reference, increase the setting value in 0.1 unit increments.
• If the motor speed is faster than the frequency reference, decrease the setting value in 0.1 unit increments.
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