8 Motion Commands
8-22
(g) POT Only Method
Travel is started at the approach speed in the positive direction until the stroke limit is reached. When the
POT signal is detected, the direction is reversed to return at Positioning speed. When a change in the POT
signal status from ON to OFF is detected, positioning is performed. When positioning has been completed, a
machine coordinate system is established with the final position as the zero point.
The moving amount after the POT signal changed is detected is set in the Home Offset. The positioning
speed is set in the Speed Reference. If a negative value is set for the approach speed, the command will end in
an error. If an OT signal is detected during the positioning speed operation, an OT alarm will occur.
Detecting the change in the POT signal status is performed using software processing. The position where
positioning is completed will vary with the high-speed scan setting, positioning speed, etc. Do not use this
method if repeat accuracy is required in the position where the zero point return operation is completed.
Starting on the Positive Overtravel Limit (POT)
* 1. The SERVOPACK P-OT signal.
* 2. The SERVOPACK N-OT signal.
Note: The stopping method when the OT signal is detected depends on the setting of
SERVOPACK parameters.
NOT
*2
POT
*1
Start
Zero Point
Approach Speed
(OL
3E)
Home Offset
(OL
42)
Positioning Speed
(OL
10)
POT
∗
1
Start
Zero Point
Home Offset
(OL
42)
Positioning Speed
(OL
10)
NOT
∗
2
Parameter
Name
Setting
OW
3C
Home Return Type
13:
POT Only Method
OL
10
Speed Reference
Set the positioning speed to use after detecting the POT signal
change. The sign is ignored. The travel direction will depend on the
sign of the Home Offset.
OL
3E
Approach Speed
Set the speed to use when starting a zero point return. Add a sign so
that the travel direction will be positive.
OL
42
Home Offset
Set the travel distance from the point where the POT signal change is
detected. The travel direction will depend on the sign.
