Parameter Details
11
11.10 n: Special Adjustment
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 997
■ n4-74: Limit of Flux Loop
No.
(Hex.)
Name Description
Default
(Range)
n4-74
(1B8E)
Limit of Flux Loop
Sets the control level for flux loop control output.
160%
(100 - 500%)
If the torque is not sufficient because of 100% or more loads, increase the setting value in 20% increments. If the
setting is too high, overexcitation could occur and overheat the motor.
◆ n5: Feed Forward Control
Feed forward control increases the responsiveness of acceleration and deceleration as specified by the speed
reference.
Increase the values set in C5-01 and C5-03 [ASR Proportional Gain] to apply feed forward control to machines
that have low rigidity and are possible to have hunting and vibration or to machines that have a large quantity of
inertia. When you use this function in CLV control, it also helps prevent overshoot. Refer to Figure 11.148 for
more information. Refer to Figure 11.149 for more information about parameters related to feed forward control.
Set A1-02 [Control Method Selection] is set to one of these values to enable feed forward control:
• 3: Closed Loop Vector Control
• 4: Advanced OpenLoop Vector Control
• 6: PM Advanced Open Loop Vector
• 7: PM Closed Loop Vector Control
Note:
• You cannot use feed forward control to increase responsiveness in applications where you apply loads externally during run at constant
speed.
• When you use the Droop control function, set n5-01 = 0 [Feed Forward Control Selection = Disabled].
• You cannot use feed forward control with motor 2.
Figure 11.148 Suppress Overshooting with Feed Forward Control
Figure 11.149 Configure Feed Forward Control
■ Before You Use Feed Forward Control
Do one of these procedures before you use feed forward control.
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