8 Motion Commands
8-18
(c) DEC1 + ZERO Signal Method
Travel is started at the zero point return speed in the direction specified in the parameters. When the rising
edge of the DEC1 signal is detected, the speed is reduced to the approach speed. When the rising edge of the
ZERO signal is detected after passing the DEC1 signal, the speed is reduced to the creep speed and position-
ing 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 DEC signal.
* 2. The SERVOPACK EXT1 signal.
* 3. The SERVOPACK P-OT signal.
* 4. The SERVOPACK N-OT signal.
DEC1 signal
*1
NOT
∗
4
POT
∗
3
Start
Zero Point
Creep Speed
(OL
40)
Home Offset
(OL
42)
ZERO signal
*2
Approach speed
(OL
3E)
Zero Point Return Speed
(OL
10)
Parameter
Name
Setting
OW
3C
Home Return Type
2: DEC1 + ZERO Signal Method
OB
093
Home Direction
Set the zero point return direction.
OL
10
Speed Reference
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
18
Speed Override
This parameter allows the Zero Point Return speed to be changed
without changing the Speed Reference (OL
10). Set the speed as
a percentage of the Speed Reference Setting. This setting can be
changed during operation.
Setting range: 0 to 32767 (0% to 327.67%)
Setting unit: 1 = 0.01%
Example: Setting for 50%: 5000
OL
3E
Approach Speed
Set the speed to use after detecting the DEC1 signal. 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 after passing the
DEC1 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 after passing the DEC1 signal. 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.
