YASKAWA CR700 Technical Manual

11.3 b: Application
598 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
■ b7-02: Droop Control Delay Time
No.
(Hex.)
Name Description
Default
(Range)
b7-02
(01CB)
RUN
Droop Control Delay Time
Sets the responsiveness of Droop control. Decrease this setting when drive response is slow.
Increase this setting when hunting or oscillation occur.
0.05 s
(0.03 - 2.00 s)
■ b7-03: Droop Control Limit Selection
No.
(Hex.)
Name Description
Default
(Range)
b7-03
(017E)
Droop Control Limit
Selection
Sets the Droop control limit function.
1
(0, 1)
0 : Disabled
1 : Enabled
◆ b9: Zero Servo
Zero Servo is a position control function that stops and holds the motor shaft. The drive secures the stopped motor
so that the motor does not move when an external force is applied.
The drive saves the home position when the Zero Servo function is enabled. The drive can correct the motor
position to bring the motor back to the home position, even if the load rotates the motor.
Set H1-xx = 72 [MFDI Function Selection = Zero Servo] to enable Zero Servo. The drive begins Zero Servo once
the multi-function digital input terminal set for Zero Servo [H1-xx = 72] switches ON and the motor speed drops
below the value set in b2-01 [DC Injection/Zero SpeedThreshold]. The drive stops and holds the motor in the Zero
Servo start position. The drive will continue to hold the motor in position as long as Zero Servo is enabled, even if
the frequency reference rises above the setting in b2-01. The drive accelerates back to the frequency reference
when the multi-function digital input terminal assigned to trigger the Zero Servo function is released and the Run
command is still present.
Note:
Zero Servo is available when A1-02 = 3 [Control Method Selection = Closed Loop Vector].
Figure 11.28 Zero Servo Time Chart
Monitor U6-22 [ZeroServo Pulse Move] shows 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 an MFDO 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 Window]”.
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV

YASKAWA CR700 Specifications

General

Brand	YASKAWA
Model	CR700
Category	DC Drives
Language	English