N5: Feed Forward Control - YASKAWA GA800 Programming Manual

2.10 n: Special Adjustment
Set A1-02 = 4 [Control Method Selection = AOLV] and n4-72 = 1 [Speed Feedback Mode = With Encoder] to use
this parameter.
Parameter F1-02 [Encoder Signal Loss Detect Sel] sets the drive response when the drive detects a disconnected
encoder. This parameter sets the drive to start up in the Without Encoder Mode or With Encoder Mode if the drive
detects PGo [Encoder (PG) Feedback Loss].
Note:
A PG-B3 encoder option is necessary to use this parameter. When you use a PG-X3 option, it is not necessary to set this parameter.
If the drive detects PGo, de-energize the drive and examine the wiring for the encoder.
0 : Without Encoder
1 : With Encoder
■
n4-74: Limit of Flux Loop
No.
Name
(Hex.)
n4-74 Limit of Flux Loop
(1B8E)
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.
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n5: Feed Forward Control

Feed forward control increases the responsiveness of acceleration and deceleration as specified by the speed
reference.
Increase 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
information about parameters related to feed forward control.
Set A1-02 [Control Method Selection] 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.
494
V/f CL-V/f OLV CLV
Sets the control level for flux loop control output.
Figure 2.144 Suppress Overshooting with Feed Forward Control
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Figure 2.144. Refer to
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Default
(Range)
250%
(100 - 500%)
Figure 2.145 for more