Yaskawa MP920 User's Manual Design - Manual (Page 172)

4 Motion Control
4.4.4 Zero Point Return (ZRET)
4-58
„ DEC2 + C-phase Pulse
This method is used to perform zero point return using a limit switch (deceleration limit
switch) and a zero point signal (C-phase pulse) by rapid traverse using linear acceleration/
deceleration (without a dog width).
This method can be used in the mechanical configuration with the limit switch as shown in
the illustration below.
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
Pattern (A)
Pattern (B)
SVA-01A SVA-02A SVB-01 PO-01
Applicable Applicable N/A N/A
High
Low
Deceleration
limit switch
Machine total
operating area
Reverse direction Forward direction
High
Low
Deceleration
limit switch
Reverse direction Forward direction
Machine total
operating area
INFO
0
1.
2.
5.
4. 3.
6.
Reverse direction ← → Forward direction
Zero point
Speed
reference
Rapid traverse speed
Approach speed
Creep speed
Zero point
return position
Dog
(Deceleration limit switch)
Zero point signal
(C-phase pulse)
Zero point return
final travel distance
Time