7
Motion Commands
7.2.3
Zero Point Return (ZRET)
7-24
[ d ] Phase-C Method (OW
3C = 3)
z
Operation after Zero Point Return Starts
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 the 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 (OL
42).
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.
z
Setting Parameters
NOT
*2
POT
*1
Start
Zero Point
Phase-C pulse
Home Offset
(OL42)
Creep Speed
(OL40)
Approach Speed
(OL3E)
Parameter Name Setting
OW
3C
Home Return Type
3: Phase-C 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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