YASKAWA MP2000 Series User Manual page 164

[ e ] DEC2 + ZERO Signal Method (OW3C = 4)
With this method, the machine's position is confirmed by the ON/OFF status of the DEC2 signal and the retracting
operation is performed automatically, so the zero point return is always performed with the same conditions.

Starting the Zero Point Return in the High Region
1.
Travel is started in the forward direction at the speed specified by the Speed Reference Setting (setting
parameter OL10).
2.
When the falling edge of the DEC2 signal is detected, the axis decelerates to a stop.
3.
After decelerating to a stop, the axis travels in the reverse direction at the Approach Speed (setting
parameter OL3E).
4.
When the rising edge of the DEC2 signal is detected, the axis decelerates to a stop.
5.
After decelerating to a stop, the axis travels in the forward direction at the Creep Rate (setting parame-
ter OL40).
6.
After the falling edge of the DEC2 signal is detected, the position is latched when the rising edge of the
ZERO signal is detected.
7.
The axis moves from the latched position by the distance set in the Zero Point Return Travel Distance
(setting parameter OL42) and stops. The machine coordinate system is established with this final
position as the zero point.
DEC2
(DI_5 or OW 05, bit 8)
 If an OT signal is detected during zero point return operation, an OT alarm will occur.
High region
Speed Reference Setting
(OL
N-OT
(DI_4)
Start
ZERO signal
(DI_2)
Low region
10) ZERO signal latch
at this position
Creep Rate
(OL 40)
Zero Point Return Travel Distance
Approach Speed (OL 3E)
7.2 Motion Command Details
7.2.3 Zero Point Return (ZRET)
P-OT
(DI_3)
End
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