Precautions When Using An External Incremental Encoder By Magnescale - YASKAWA SGDV series User Manual

8 Fully-closed Loop Control

8.1.6 Precautions When Using an External Incremental Encoder by Magnescale

8.1.6

Precautions When Using an External Incremental Encoder by Magnescale

When an external incremental encoder by Magnescale Co., Ltd. is used, the count direction of the encoder
determines if a phase-C pulse (CN1-19, CN1-20) is output and counted.
Note: The count direction (counting up or down) of the encoder determines if a phase-C pulse is output. The output of the
pulse does not depend on the settings of these parameters: Pn000.0 (motor rotational direction ) and Pn002.3 (exter-
nal encoder usage method).
When Passing 1st Zero Point in Forward Direction and Returning after Power ON
After the power is turned on, the phase-C pulse (CN1-19, CN1-20) is output when the external encoder moves
forward and its detection head first passes the phase-C detection position. After the detection head of the
encoder passes the detection position in a forward direction, the phase-C pulse is output when the head passes
the position regardless of the direction of the encoder's movement.
Scale count-up direction
Phase-C detection position
Phase-C pulse output
8-8
Model Interpolator
SL710
SL720 PL101-RY
SL730
SR75
SR85
Power ON
The phase-C pulse is also output when the detection head of the encoder passes
this point in reverse, because the SERVOPACK has recorded the position
where the phase-C pulse was originally output when first passing the position in the forward direction.
Scale pitch (μm)
800
800
800
80
80
Rotation
Time