YASKAWA GA700 Technical Manual page 642

11.3 b: Application
Monitor U6-22 [ZeroServoPulse Move] displays the deviation between the actual position of the motor shaft and
Zero Servo start position when Zero Servo is enabled. Divide the number of pulses shown in U6-22 by 4 to find
deviation.
The drive will turn ON a multi-function digital output terminal set for Zero Servo Complete [H2-xx = 33] once
the position of the motor shaft is within the range "Zero Servo start position ± b9-02 [Zero Servo Completion
Width].
Note:
• Leave the Run command ON when using 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.
• The drive will detect dv4 [Inversion Prevention Detection] if an external force rotates the motor during Zero Servo when A1-02 = 7
[PM Closed Loop Vector Control]. Increase b9-01 [Zero Servo Gain] or increase the number of pulses set in F1-19 [Deviation 4
Detection Selection] to prevent dv4 detection.
■
b9-01: Zero Servo Gain
No.
Name
(Hex.)
b9-01 Zero Servo Gain
(01DA)
Increase this setting if the drive is not responsive, or if there is too much deviation from the Zero Servo start point
when increasing the load. Lower this setting if oscillation or hunting occurs.
Note:
• Parameter C5-xx [Automatic Speed Regulator (ASR)] must be set appropriately before adjusting the Zero Servo gain.
• Oscillation and hunting should not occur while operating with the Zero-Servo command enabled.
■
b9-02: Zero Servo Completion Width
No.
Name
(Hex.)
b9-02 Zero Servo
Completion Width
(01DB)
The drive will turn ON a multi-function digital output terminal set for Zero Servo Complete [H2-xx = 33] once
the position of the motor shaft is within the range "Zero Servo start position ± b9-02."
642
V/f CL-V/f OLV CLV AOLV
Sets the responsiveness for the Zero Servo function.
V/f CL-V/f OLV CLV AOLV
Sets the output width that triggers the Zero Servo complete command. Set
the allowable position displacement (deviation) from Zero Servo start
position.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
5
(0 - 100)
Default
(Range)
10
(0 - 16383)