Yaskawa MP2000 - Manual (Page 55)

TECHNICAL NOTE
(g) POT
The movement starts at the approach speed, and moves to the stroke limit in a
positive direction. The movement reverses when the POT signal is detected.
While in reverse motion at positioning speed and POT is cleared the final
positioning is performed. The machine coordinate system is established with the
position to be the HOME.
The amount of the movement from the change detection point of the POT signal
status is set in the final travel distance of homing and the positioning speed is set
in the rapid feed speed.
When the OT signal is detected while moving at the positioning speed, it
becomes OT alarm.
Detection of the OT signal status change is done by the software. Therefore,
positioning accuracy can not be guaranteed because of high-speed scan time
and positioning speed.
Please do not use this method if repeatability is required for the home position.
File: MP2000_IndividualFunctionDocument_RevC 55/168
Doc Number: eng.MCD.05.101
11/17/2005