YASKAWA E-7-Series SGD7S Product Manual page 217

6.8 Encoder Divided Pulse Output
6.8.1 Encoder Divided Pulse Output Signals
 When Using a Linear Encoder with Multiple Origins and First Passing the Origin Posi-
tion in the Forward Direction and Returning after Turning ON the Power Supply
The encoder's phase-C pulse is output when the origin detection position is passed for the first
time in the forward direction after the power supply is turned ON. After that, the phase-C pulse
is output whenever the origin detection position is passed in the forward or reverse direction.
Encoder count-up
direction
Origin 1 detection
position
Origin 2 detection
position
Phase-C pulse
output
 When Using a Linear Encoder with Multiple Origins and First Passing the Origin Posi-
tion in the Reverse Direction after Turning ON the Power Supply
The encoder's phase-C pulse is not output when the origin detection position is passed for the
first time in the reverse direction after the power supply is turned ON.
However, after the origin detection position is passed in the forward direction and the encoder's
phase-C pulse it output, it will then also be output when the origin detection point is passed in
the reverse direction.
Encoder count-up
direction
Origin 1 detection
position
Origin 2 detection
position
Origin 3 detection
position
Phase-C pulse
output
6-48
Power ON
Origin 1
Origin 1
The phase-C pulse is not
output.
Power ON
Origin 2
Origin 1
The SERVOPACK records the position where
the phase-C pulse was output for movement
in the forward direction, and the phase-C
pulse is also output for reverse movement.
Time
Even after origin 1 has been passed in
the forward direction, the phase-C pulse
is not output here because origin 2 is
passed in the reverse direction.
Origin 2
Origin 2
Time
Origin 3 Origin 3
S
S