7
Motion Commands
7.2.3
Zero Point Return (ZRET)
7-26
[ f ] POT & C Pulse Method (OW

3C = 12)
z
Operation after Zero Point Return Starts
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 creep speed.
When the phase-C pulse is detected during the return after passing the POT signal, the 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. 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.
* 1. The SERVOPACK P-OT signal.
* 2. The SERVOPACK N-OT signal.

The stopping method when the OT signal is detected depends on the setting of SERVO-
PACK parameters.
z
Setting Parameters
Phase-C pulse
NOT
*2
POT
*1
Start
Zero Point
Approach Speed
(OL3E)
Home Offset
(OL42)
Positioning Speed
(OL10)
Creep Speed
(OL40)
Parameter Name Setting
OW

3C
Home Return Type
12: POT & C pulse method
OL

10
Speed Reference
Set the positioning 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

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 reverse speed to use 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.
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