Yaskawa MP2200 Machine Controller - Manual (Page 271)

5.2 Motion Command Details
5-41
（ Note） Reverse type in : Parameters only for the SVA-01 Module.
[ k ] POT Signal Method (OW††3C = 13)
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 OT 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)
Parameter Name Setting
OW††3C Home Return Type 12: POT & C pulse Method
OL††10 Speed Reference
Set the zero point return speed to use after detecting the phase-C pulse.
The sign is ignored. The zero point return 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 positive.
OL††40 Creep Speed
Set the speed to reverse at after detecting the POT signal. The sign is
ignored. The travel direction will be negative.
OL††42 Home Offset
Set the travel distance from the point where a phase-C pulse is detected.
The travel direction will depend on the sign.
NOT *2
POT *1
Start
Zero Point
Approach Speed
(OL 3E)
Home Offset
(OL 42)
Positioning Speed
(OL 10)