11.10 n: Special Adjustment
996 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ n4-69: Flux Control Response
No.
(Hex.)
Name Description
Default
(Range)
n4-69
(1B89)
Flux Control
Response
Unifies control of magnetic flux to make motor vibrations more stable.
1.00
(0.00 - 60.00)
If step-out occurs when the load changes, decrease the setting value in 1.00 increments.
Note:
If heavy loads decrease motor speed, increase the setting value in 1.00 increments. If it does not get better, increase n4-74 [Limit of Flux
Loop] in 20% increments.
■ n4-70: Speed Command Comp @ Low Freq
No.
(Hex.)
Name Description
Default
(Range)
n4-70
(1B8A)
Speed Command
Comp @ Low Freq
Sets the function to make the drive more stable when operating at low
speeds. Usually it is not necessary to change this setting.
0.60 Hz
(0.00 - 1.50 Hz)
This function makes the control more stable when operating at low speeds. Increase the setting in 0.3 Hz
increments at the time of low-speed references with no load.
Note:
If you increase this parameter to make the speed references for low speeds more stable, it can make the speed control less accurate.
■ n4-72: Speed Feedback Mode
No.
(Hex.)
Name Description
Default
(Range)
n4-72
(1B8C)
Speed Feedback
Mode
Sets the requirement for an encoder option when A1-02 = 4 [Control
Method Selection = Advanced Open Loop Vector].
0
(0, 1)
You can connect a PG-B3 or PG-X3 encoder option in AOLV control. You can use the encoder option for better
speed control precision.
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 = Advanced Open Loop Vector] 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 when 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
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