8.4 Zero Point Return (ZRET)
8-19
8
(d) C-Phase Method
Travel is started at the approach speed in the direction specified in the parameters. When the rising edge of
the phase-C pulse is detected, the speed is reduced to the creep speed and 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 phase-C pulse is detected is set in the Home Offset. If an OT signal is detected
during the zero point return operation, an OT alarm will occur.
* 1. The SERVOPACK P-OT signal.
* 2. The SERVOPACK N-OT signal.
NOT
*2
POT
*1
Start
Zero Point
Creep Speed
(OL40)
Home Offset
(OL42)
Phase-C pulse
Approach Speed
(OL3E)
Parameter Name Setting
OW

3C Home Return Type
3
:
C-Phase Method
OB

093 Home Direction Set the zero point return direction.
OL

3E Approach Speed Set the speed to use when starting a zero point return. Only a positive
value can be set; a negative value will result in an error.
OL

40 Creep Speed Set the speed to use after detecting the phase-C pulse. Only a positive
value can be set; a negative value will result in an error.
OL

42 Home Offset Set the travel distance from the point where a phase-C pulse is
detected. If the sign is positive, travel will be toward the zero point
return direction; if the sign is negative, travel will be away from the
zero point return direction.
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