Home Position Return Retry Function - Mitsubishi Electric MELSEC Q Series Programming Manual

6 POSITIONING CONTROL

6.23.16 Home position return retry function

[Data Setting]
[Control details]
Acceleration time Deceleration time
5)
4)
Proximity dog
Fig. 6.51 Operation for home position return retry (proximity dog method)
When a current value has been exceeded home position during positioning control,
etc., even if it executes the home position return, depending on the position of current
value, a current value may not travel to home position direction. In this case, a current
value is normally travelled before the proximity dog by the JOG operation, etc, and the
home position return is started again. However, by using the home position return retry
function, the home position return can be executed regardless of current value position.
Refer to Section 6.23.1(7) for home position return method by using the home position
return retry function.
When the "home position return retry function" is used, set the following "home position
return data" using MT Developer2.
Set the "dwell time at the home position return retry" as required.
Set the parameters for every axis.
Table 6.4 Home position return data
Items
Home position return
retry function
Dwell time at the home
position return retry
Operation for the home position return retry function is shown below.
(1) Home position return retry operation setting a current value within the range of
external limit switch
Home position
return direction
6)
Home
position
Setting details
0 : Invalid (Do not execute the home position
return retry by limit switch.)
1 : Valid (Execute the home position return
retry by limit switch.)
The stop time at the deceleration stop during
the home position return retry is set.
1) 2)
Home position
return start
3)
External limit switch
Zero point
6 - 243
Setting
Initial value
value
0, 1 0
0 to 5000
0
[ms]
1) It travels to preset direction of
home position return.
2) If the external upper/lower
limit switch turns OFF before
the detection of proximity dog,
a deceleration stop is made.
3) After a deceleration stop, it
travels to reverse direction of
home position return with the
home position return speed.
4) A deceleration stop is made by
the proximity dog OFF.
5) After a deceleration stop, it
travels to direction of home
position return.
6) Home position return ends.