12.10 n: Special Adjustment
1018 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Note:
• When you use an encoder option in AOLV control to operate machinery, specialized tuning of the drive can be necessary. You should
usually set A1-02 = 3 [Control Method Selection = Closed Loop Vector] when you use an encoder option.
• When you set this parameter to 1, also set the number of PG pulses in F1-01 [Encoder 1 Pulse Count (PPR)].
0 : Without Encoder
1 : With Encoder
■ n4-73: PGo Recovery Selection
No.
(Hex.)
Name Description
Default
(Range)
n4-73
(1B8D)
PGo Recovery Selection
Sets the restart mode to Without Encoder Mode or the With Encoder Mode when an encoder is
disconnected.
0
(0, 1)
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.
(Hex.)
Name Description
Default
(Range)
n4-74
(1B8E)
Limit of Flux Loop
Sets the control level for flux loop control output.
250%
(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 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 12.144. Refer to Figure 12.145 for more
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.
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