5.3 C: Tuning
• C3: Slip Compensation
The Slip Compensation function improves the speed accuracy of an induction motor. By adjusting the output speed in
accordance with the motor load, it compensates the slip and makes the motor speed equal to the speed reference.
Note: Perform Auto-Tuning and make sure that the m otor rated current (E2-01), the m otor rated slip (E2-02), and the no-load current
(E2-03) have all been set properly before making any adjustm ents to slip com pensation parameters.
■ C3-01: Slip Compensation Gain
Sets the gain for the motor slip compensation function. Although this parameter rarely needs to be changed, adjustments
may be necessary under the following circumstances:
• Increase the setting if the motor at constant speed is slower than the speed reference.
• Decrease the setting if the motor at constant speed is faster than the speed reference.
No.
Parameter Name
Setting Range
Default
C3-01
Slip Compensation Gain
0.0 to 2.5
1.0
■ C3-02: Slip Compensation Primary Delay Time
Adjusts the filter on the output side o f the slip compensation function. Although this parameter rarely needs to be
changed, adjustment may help in the following situations:
• Decrease the setting when the slip compensation response is too slow.
• Increase this setting when speed is unstable.
No.
Parameter Name
Setting Range
Default
C3-02
Slip Compensation Primary D elay Time
0 to 10000 ms
2000 ms
■ C3-03: Slip Compensation Limit
Sets the upper limit for the slip compensation function as a percentage o f the motor rated slip (E2-02).
No.
Parameter Name
Setting Range
Default
C3-03
Slip Compensation Limit
0 to 250%
200%
The slip compensation limit is constant throughout the constant torque range (speed reference < E1-06). In the constant
power range (speed reference > E1-06), it is increased based on C3-03 and the output speed as shown in
Figure 5.8.
Base
Maximum
Frequency
Frequency
F ig u r e 5.8 S lip C o m p e n s a t i o n Lim it
■ C3-04: Slip Compensation Selection during Regeneration
Enables or disables slip compensation during regenerative operation.
This function does not operate when the output frequency is too low, regardless o f whether it has been enabled.
No.
Parameter Name
Setting Range
Default
C3-04
Slip Compensation Selection during Regeneration
0 to 2
0
Setting 0: Disabled
Slip compensation is not provided. The actual motor speed might be higher than the speed reference.
Setting 1: Enabled (6 Hz and above)
Slip compensation is enabled during regenerative operation. It will not be active at output frequencies below 6 Hz.
Setting 2: Enabled (compensation provided w herever possible)
Slip compensation is enabled during regenerative operation and at frequencies as low as 2 Hz. The drive uses the motor
rated slip set to E2-02 to automatically calculate the frequency range where compensation will be disabled.
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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