11.4 C: Tuning
756 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Note:
• Correctly set these parameters before changing the slip compensation gain:
–E2-01 [Motor Rated Current (FLA)]
–E2-02 [Motor Rated Slip] (Set during Auto-Tuning when A1-02 = 2 [Control Method Selection = Open Loop Vector])
–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 the 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.
It can be necessary to adjust the parameter in these conditions:
• If the motor speed is slower than the frequency reference, increase this parameter by 0.1.
• If the motor at constant speed is faster than the frequency reference, decrease this parameter by 0.1.
■ 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)
It can be necessary to adjust the parameter in these conditions:
• If the speed is not stable, increase this parameter.
• If 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 power range, the frequency reference > E1-06 increases with the C3-03 value and the
output frequency as shown in Figure 11.52.
Figure 11.52 Slip Compensation Limit
■ C3-04: Slip Compensation at Regen
No.
(Hex.)
Name Description
Default
(Range)
C3-04
(0212)
Slip Compensation at
Regen
Sets the slip compensation function during regenerative operation.
0
(0 - 2)
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