Yaskawa MP2200 Machine Controller - Manual (Page 277)

5.2 Motion Command Details
5-47
[ o ] NOT Signal Method (OW††3C = 17)
Travel is started at the approach speed in the negative direction until the stroke limit is reached.
When the NOT signal is detected, the direction is reversed to return at Positioning speed. When a
change in the NOT 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 NOT signal changed is detected is set in the Home Offset. The
positioning speed is set in the Speed Reference. If a positive 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 NOT 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.
* 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.
（ Note） Reverse type in : Parameters only for the SVA-01 Module.
NOT *2
POT *1
Zero Point
Start
Approach Speed
(OL 3E)
Home Offset
(OL 42)
Positioning Speed
(OL 10)
Parameter Name Setting
OW††3C Home Return Type 17: NOT Only Method
OL††10 Speed Reference
Set the positioning speed to use after detecting the NOT signal change.
The sign is ignored. The travel direction will depend on the sign of the
Home Offset.
OL††18 Speed Override
This parameter allows the Zero Point Return speed to be changed
without changing the Speed Reference (OL††10). Set the
override value as a percentage of the Speed Reference. This
setting can be changed during operation.
Setting range: 0 to 32767 (0% to 327.67%);
Setting unit: 1 = 0.01%
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 negative.
OL††42 Home Offset
Set the travel distance from the point where the NOT signal change is
detected. The travel direction will depend on the sign.