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16. FULLY CLOSED LOOP SYSTEM
(c) About dog type home position return when using the rotary encoder of a serial communication servo
motor
The home position for when using the rotary encoder of a serial communication servo motor for the
load-side encoder is at the load-side Z-phase position.
Load-side encoder
Z-phase signal
Reference home position
Machine position
16.3.3 Operation from controller
An absolute type linear encoder is necessary to configure an absolute position detection system under fully
closed loop control using a linear encoder. In this case, the encoder battery need not be installed to the
servo amplifier. When an rotary encoder is used, an absolute position detection system can be configured by
installing the encoder battery to the servo amplifier. In this case, the battery life will be shorter because the
power consumption is increased as the power is supplied to the two encoders of motor side and load side.
Positioning operation from the controller is basically performed like the semi closed loop control.
POINT
To execute a home position return securely, start a home position return after
moving the axis to the opposite stroke end by jog operation, etc. of the
controller.
If the incremental linear encoder does not have a linear encoder home position
(reference mark), only the home position return type without using Z-phase can
be performed.
ON
OFF
Equivalent to one servo motor revolution
Servo amplifier
power-on position
16 - 14
Home position
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