B9: Zero Servo - YASKAWA GA700 Technical Manual

In doing so, this mode shuts off the main circuit power supply by shutting off the input side electromagnetic
contactor (MC) using the relay output of a multi-function digital output terminal after the drive stops, and reduces
standby electricity of the drive.
Note:
Make sure the following conditions are satisfied when using this function.
• Connect an external 24 V power supply.
• Connect a electromagnetic contactor to the drive input side and connect the multi-function digital output terminal that has been
configured with H2-xx = 65 [Standby output]. The electromagnetic contactor must be off when the multi-function digital output
terminal is off.
• Repetitive opening and closing of the electromagnetic contactor due to frequent starts and stops may reduce the service life of the
drive.
A - Drive
B - Multi-function Digital Output
Terminal
■
b8-51: Standby Mode Waiting Time
No.
Name
(Hex.)
b8-51 Standby mode
waiting time
(0B01)
◆

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 Select = 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, 7 [Control Method Selection = Closed Loop Vector Control , PM Closed Loop Vector Control].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
Configures the delay time until the input side electromagnetic contactor
shuts off after the drive stops.
Figure 11.43 Zero Servo Time Chart
C - External 24 V power supply
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
11.3 b: Application
Default Setting
(Range)
600 s
(0 - 6000 s)
11
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