Parameter Details
11
11.3 b: Application
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 599
Note:
• Keep the Run command active when you use the Zero Servo function. The drive will not hold the motor shaft in position if the Run
command is switched OFF.
• The terminal set for Zero Servo Complete will switch OFF once the Zero-Servo command is switched OFF.
• Do not have the Zero Servo function hold 100% load for prolonged periods of time. Doing so may damage the drive. If the application
needs to hold 100% load for long periods using Zero Servo, then either operate within 50% of the drive rated output current, or select a
larger capacity drive.
■ b9-01: Zero Servo Gain
No.
(Hex.)
Name Description
Default
(Range)
b9-01
(01DA)
Zero Servo Gain
Sets the responsiveness for the Zero Servo function.
5
(0 - 100)
If the drive is not responsive, or if there is too much deviation from the Zero Servo start point when you increase
the load, increase this setting. If oscillation or hunting occurs, decrease this setting.
Note:
• Set C5-xx [Automatic Speed Regulator (ASR)] parameters correctly before you adjust the Zero Servo gain.
• When you operate with the Zero Servo command enabled, oscillation and hunting must not occur.
■ b9-02: Zero Servo Completion Window
No.
(Hex.)
Name Description
Default
(Range)
b9-02
(01DB)
Zero Servo Completion
Window
Sets the range to trigger an output terminal set for “Zero Servo Complete” during Zero Servo
operation. Be sure to set the deviation from the Zero Servo start position.
10
(0 - 16383)
When the position of the motor shaft is in the range of “Zero Servo start position ± b9-02”, the drive will activate a
MFDO set for Zero Servo Complete [H2-xx = 33].
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