YASKAWA CIMR-G7U Technical Manual page 356

Time Chart
A time chart for the zero servo function is given in Fig 6.74 Time Chart for Zero Servo.
Application Precautions
Be sure to leave the run command input ON. If the run command is turned OFF, the output will be inter-
•
rupted and the zero-servo function will become ineffective.
The holding force of the zero-servo is adjusted in b9-01. The holding force will increase if the value of the
•
setting is increased, but oscillation and hunting will occur if the setting is too large. Adjust b9-01 after
adjusting the speed control gain.
The zero-servo detection width is set as the allowable position offset from the zero-servo start position. Set
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4 times the number of pulses from the PG.
The Zero Servo End signal will go OFF when the zero servo command is turned OFF.
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IMPORTANT
-138
6
Run command
Zero servo command
Frequency (speed) reference
Excitation level
b2-01
Motor speed
Zero Servo End signal
Fig 6.74 Time Chart for Zero Servo
Do not lock the servo for extended periods of time at 100% when using the zero servo function. Drive errors
may result. Extended periods of servo lock can be achieved by ensuring that the current during the servolock
is 50% or less or by increasing the Drive capacity.
ON OFF
ON
Zero-servo status
OFF