Limit Switch Combined Type - Mitsubishi Electric MELSEC Q Series User Manual

7 OPR CONTROL

7.6 Limit Switch Combined Type

The limit switch sensor in the opposite direction of the home sensor is used for OPR.
This method moves towards the limit switch and beings decelerating when the sensor
turns on. Movement then reverses and the home position is the first Z pulse after the
sensor turns back off.
Operation outline is shown below.
1) It moves in the opposite direction against of direction set in "
direction" at the speed set in "
2) A deceleration stop is made with the limit switch detection of the opposite
direction against of OPR.
3) After deceleration stop, it moves in direction of OPR at the speed set in
" Creep speed", and it stops at the limit switch detection. Thereafter, it
Pr.56
restarts and the OPR completes at the first zero point.
OPR direction
Pr.51
V
1)
OPR start
Zero point
POINT
While it is moving in the direction of OPR at the speed set in "
the OPR is executed by calculating the movement distance to OP even if the zero
point in not passed at the limit switch OFF.
However, it cannot be stopped to zero point securely in the incremental encoder.
(1) A limit switch is detected at the start up position
If a limit switch of the opposite direction against of OPR is ON at the start, the
OPR is executed in operation of this section 3).
OPR speed".
Pr.54
2)
OP
Limit switch
7 - 11
MELSEC-Q
OPR
Pr.51
OPR speed
Pr.54
3)
Creep speed
Pr.56
Creep speed",
Pr.56