Parameter Details
11
11.10 n: Special Adjustment
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 777
■ 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%)
Increase the setting value in 20% increments when the torque is insufficient due to loads of at least 100%. Note
that if the setting is too high, overexcitation could occur causing the motor generate heat.
◆ n5: Feed Forward Control
Feed forward control improves responsiveness of acceleration and deceleration in accordance with the speed
reference.
Increasing the values set in C5-01 and C5-03 [ASR Proportional Gain] is effective in applying feed forward
control to machines with low rigidity for which hunting and vibration are likely to occur or to machines with
significant inertia. Applying this function while using CLV control also helps prevent overshooting. Refer to
Figure 11.97. Refer to Figure 11.98 for more information about parameters related to Feed Forward control.
Feed forward control is enabled when A1-02 [Control Method Selection] is set to any of the following.
• 3: Closed Loop Vector
• 4: Advanced Open Loop Vector
Note:
• Responsiveness cannot be improved with feed forward control for applications in which loads are applied externally during run at
constant speed.
• When using the Droop control function, set n5-01 = 0 [Feed Forward Control Selection = Disabled].
• Feed forward control cannot be used with motor 2.
Figure 11.97 Suppress Overshooting with Feed Forward Control
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