11.4 C: Tuning
758 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ C3-18: Output Voltage Limit Level
No.
(Hex.)
Name Description
Default
(Range)
C3-18
(0263)
Expert
Output Voltage Limit
Level
Sets the maximum drop width of the voltage reference when C3-05 = 1
[Output Voltage Limit Selection = Enabled].
90.0%
(50.0 - 100.0%)
■ C3-21: Motor 2 Slip Compensation Gain
No.
(Hex.)
Name Description
Default
(Range)
C3-21
(033E)
RUN
Motor 2 Slip
Compensation Gain
Sets the gain for the motor 2 slip compensation function. Usually it is not
necessary to change this setting.
Determined by E3-01
(0.0 - 2.5)
Note:
Correctly set these parameters before changing the slip compensation gain:
• E4-01 [Motor 2 Rated Current]
• E4-02 [Motor 2 Rated Slip] (Set during Auto-Tuning when E3-01 = 2 [Motor 2 Control Mode Selection = Open Loop Vector])
• E4-03 [Motor 2 Rated No-Load Current]
It can be necessary to adjust this parameter in these conditions:
• If the motor speed is slower than the frequency reference, increase C3-01 in 0.1 unit increments.
• If the motor at constant speed is faster than the frequency reference, decrease C3-01 in 0.1 unit increments.
■ C3-22: Motor 2 Slip Comp Delay Time
No.
(Hex.)
Name Description
Default
(Range)
C3-22
(0241)
RUN
Motor 2 Slip Comp
Delay Time
Sets the slip compensation delay time for motor 2 when speed is unstable or
when the slip compensation response is too slow. Usually it is not necessary
to change this setting.
Determined by E3-01
(0 - 10000 ms)
It can be necessary to adjust this parameter in these conditions:
• When the speed is not stable, increase the setting.
• When the slip compensation response is too slow, decrease the setting.
■ 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, the frequency reference > E3-06 increases with the C3-23 value and the
output frequency as shown in Figure 11.53.
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