IAI America RCA2-SD4N - Manual (Page 85)

10. Notes on Operation
77
[3] The rod turns by rotating angle b from the position where phase Z was detected, and the
attained offset position (the offset conform to an applicable parameter value) is set as the home
(points zero).
Phase-Z detection sensor (fixed side)
Rotating angle β
The offset from the position where phase Z is
detected to the home is 1.2 mm.