12.4 C: Tuning
776 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
■ C3-01: Slip Compensation Gain
No.
(Hex.)
Name Description
Default
(Range)
C3-01
(020F)
RUN
Slip Compensation Gain
Sets the gain for the slip compensation function. Usually it is not necessary to change this setting.
Determined by A1-02
(0.0 - 2.5)
Note:
• When A1-02 = 4 [AOLV], you cannot change the setting while the drive is running.
• Correctly set these parameters before you change the slip compensation gain:
–E2-01 [Motor Rated Current (FLA)]
–E2-02 [Motor Rated Slip]
–E2-03 [Motor No-Load Current]
• When A1-02 = 3 [Closed Loop Vector], the slip compensation gain becomes the motor temperature compensation gain. When the motor
temperature increases, the motor internal constant changes and increases the slip. When you set this parameter, the drive adjusts the slip
with the increase in temperature. Adjust this parameter in these conditions: When the setting value increases, the compensation also
increases:
–The drive is doing torque control.
–There are torque limits.
–Output torque changes when the temperature changes.
Adjust this parameter as follows if necessary:
• If the motor speed is slower than the frequency reference, increase C3-01 in 0.1-unit increments.
• If the motor speed is faster than the frequency reference, decrease C3-01 in 0.1-unit increments.
■ C3-02: Slip Compensation Delay Time
No.
(Hex.)
Name Description
Default
(Range)
C3-02
(0210)
RUN
Slip Compensation Delay
Time
Sets the slip compensation delay time when speed is unstable or when the slip compensation
response is too slow. Usually it is not necessary to change this setting.
Determined by A1-02
(0 - 10000 ms)
Use these settings to adjust this parameter as necessary:
• When the speed is not stable, increase the setting.
• When the slip compensation response is too slow, decrease the setting.
■ C3-03: Slip Compensation Limit
No.
(Hex.)
Name Description
Default
(Range)
C3-03
(0211)
Slip Compensation Limit
Sets the upper limit for the slip compensation function as a percentage of the motor rated slip.
200%
(0 - 250%)
If you increase the value of C3-01 [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 ≤ E1-06 [Base Frequency]).
In the constant output range where the frequency reference > E1-06, the slip compensation limit increases with the
C3-03 value and the output frequency as shown in Figure 12.51.
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