Yaskawa MP940 User Manual
Page 466
Motion Control
11.4.4 Zero Point Return (ZRET)
11-64
• With this method, the axis recognizes the machine position by the deceleration limit switch ON/
OFF status, and automatically performs a return operation. Be sure to perform zero point return
under the same conditions.
• With pattern (B), set the deceleration limit switch inversion selection (bit 10) of motion fixed
parameter No. 17 to ON.
Zero Point Return Operation Started with the Dog (Deceleration Limit
Switch) Signal in the High Area
1. The axis travels at rapid traverse speed in the forward direction.
2. The axis decelerates at the falling edge of the dog (deceleration limit switch) signal.
3. The axis travels at approach speed in the reverse direction.
4. The axis decelerates at the rising edge of the dog (deceleration limit switch) signal.
5. The axis travels at creep speed in the forward direction.
6. After the falling edge of the dog (deceleration limit switch) is detected, the axis stops
after traveling only the zero point return final travel distance (OLC02A) from the initial
zero point signal, and that position will be the machine coordinate system zero point.
INFO
0
1.
2.
5.
4.
3.
6.
Reverse
Forward
← →
Zero point
Speed
reference
Rapid traverse speed
Creep speed
Zero point return
position
Time
Approach speed
Zero point return final travel
distance
Zero point signal
(Phase-C pulse)
Dog (Decelera-
tion limit switch)