8 Home Position Return and Internal Positions
157 SD780 Series Servo Technical Manual
b.Start the home position return →Home position signal ON →Search for the falling edge of home
position at low speed forward direction →Search for the rising edge of home position at low speed
reverse direction →Search for the Z pulse in reverse direction.
Home position
signal
Forward
direction
12-b
Home position
signal
Z pulse
Running route
Limit signal
Limit signal
Motor
L
-H
-L
Home position return method 12-b
c.Start the home position return →Home position signal OFF →Search for the rising edge of
home position at high speed reverse direction →Touch the reverse limit →Search for the falling
edge of home position at high speed forward direction →Decelerate to 0 →Search for the rising
edge of home position at low speed reverse direction →Search for the Z pulse in reverse direction.
Home position
signal
Forward
direction
12-c
Home position
signal
Z pulse
Running
route
Limit signal
Limit signal Motor
-H
H
-H
-L
Home position return method 12-c