Hardware Stroke Limit Function - Mitsubishi MELSEC-Q Series User Manual

11
AUXILIARY FUNCTION
11.5

Hardware Stroke Limit Function

When wiring hardware stroke limit is required, wire it in negative logic and use normally closed contact. Setting
positive logic and using normally open contact may result in serious accident.
This function stops control (deceleration stop) by a signal input from the limit switch. To
use this function, install limit switches to the upper limit/lower limits within physically
movable range.
Stopping control before the axis reaches to the upper/lower limit in physically movable
range prevents damage to equipment.
Normally, install the limit switches to "within the stroke limit for drive unit side/stroke end"
to stop control before the axis reaches to the stroke limit for drive unit side/stroke end.
(1) Control contents
Machine stopper
Stroke limit
for drive unit
The following shows the operation of the hardware stroke limit function.
Lower limit
QD72P3C3 controllable range
Movement
Start
direction
Deceleration stops
when the lower limit
switch is detected.
Lower limit switch
Figure 11.4 Operation chart of the hardware stroke limit function
DANGER
Upper limit
Movement
Start
direction
Deceleration stops
when the upper limit
switch is detected.
Upper limit switch
QD72P3C3
11.5 Hardware Stroke Limit Function
Machine stopper
Stroke limit
for drive unit
Drive unit
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