Yaskawa MP920 Motion Module - Manual (Page 84)

2 Motion Control
2.4.4 Zero Point Return (ZRET)
2-58
„ DEC2 + Phase-C Pulse
This method is used to perform zero point return using a limit switch (deceleration limit
switch) and a zero point signal (Phase-C pulse) by rapid traverse using linear acceleration/
deceleration (without a dog width).
The limit switch is used with a mechanical configuration such as the one shown in the fol-
lowing illustration.
1. 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.
2. 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
SVA-01A SVA-02A SVB-01 PO-01
Available Available Not available Not available
Low
High
Deceleration
limit switch Pattern (A)
Machine total
operating area
Reverse direction Forward direction
Low
High
Deceleration
limit switch Pattern (B)
Reverse direction Forward direction
Machine total
operating area
INFO
1.
2.
5.
4. 3.
6.
Speed
reference
Rapid traverse speed
Dog
(deceleration limit switch)
Zero point signal
(Phase-C pulse)
Creep speed
Approach speed
Zero point
Zero point
return position
Time
Zero point return
final travel distance
Reverse direction ← → Forward direction
0