8.4 Zero Point Return (ZRET)
8-17
8
(b) ZERO Signal Method
Travel is started at the approach speed in the direction specified in the parameters. When the rising edge of
the ZERO signal 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 ZERO signal 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 EXT1 signal.
* 2. The SERVOPACK P-OT signal.
* 3. The SERVOPACK N-OT signal.
NOT
∗
3
POT
∗
2
Start
Zero Point
Creep Speed
(OL
40)
Home Offset
(OL
42)
ZERO signal
∗
1
Approach Speed
(OL
3E)
Parameter
Name
Setting
OW
3C
Home Return Type
1: ZERO Signal 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 ZERO signal. 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 the ZERO signal 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.
