Mitsubishi Electric MELSEC Q Series Programming Manual page 424

6 POSITIONING CONTROL
Home position
V
return speed
Fig. 6.46 Home position return by the dogless home position signal reference
Fig. 6.47 Home position return by the dogless home position signal reference
(b) When the zero point is not in the home position return direction.
Home position
return direction
6)
Home
5)
position
7)
Home position
return start
Creep speed
4)
Home position
return start
method (Operation A)
POINT
Set home position return retry function to "valid". When set as "invalid" at the
detection of the external limit switch, an error occurs and stops.
(3) Home position return by the dogless home position signal reference
method (Operation B)
"Operation B" of a home position return by the dogless home position signal
reference method is shown below.
Home position
V
return direction
Creep speed
1)
Home position
return start
method (Operation B)
POINT
(1) If an external limit switch is detected during home position return operation, an
error occurs and stops.
(2) Home position return retry function cannot be used.
Home position
1) It travels to preset direction of home
return speed
position return with the home position
return speed.
1)
2) External limit switch is detected, and
a deceleration stop is made.
2)
3) After a deceleration stop, it travels to reverse
direction of home position return with the
home position return speed.
4) Home position signal (zero point) is detected,
and a deceleration stop is made.
5) After a deceleration stop, it travels to home
position return with the home position return
speed.
6) Home position signal (zero point) is detected,
and a deceleration stop is made.
3)
7) After a deceleration stop, it travels to reverse
direction of home position return with the creep
speed, the home position return ends with the
position of home position signal (zero point).
External limit switch
Zero point
2)
Home position
6 - 237
1) It travels to preset direction of home
position return with the creep speed.
2) The home position return ends with
first zero point.
Zero point