8.4 Zero Point Return (ZRET)
8-25
8
(j) NOT & C Pulse Method
Travel is started at the approach speed in the negative direction until the stroke limit is reached. When the
NOT 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 NOT signal, positioning is performed. When positioning has been com-
pleted, 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 positive 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.
Note: The stopping method when the OT signal is detected depends on the setting of
SERVOPACK parameters.
Positioning Speed
(OL
10)
Approach Speed
(OL
3E)
Phase-C pulse
NOT
*2
POT
*1
Start
Zero Point
Creep Speed
(OL
40)
Home Offset
(OL
42)
Parameter
Name
Setting
OW
3C
Home Return Type
16: NOT & C pulse Method
OL
10
Speed Reference
Set the positioning speed to use after detecting the phase-C pulse.
The sign is ignored. The travel 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 negative.
OL
40
Creep Speed
Set the speed to use after detecting the NOT signal. The travel
direction will be positive.
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.