User Manual

SAFETY
Safety handbook page - 42 -
PNSPO
7.6 Single / double break application (EN 61496 Annex A, A8)
If parts have to be put in and removed from a press machine manually then the safety
light curtain is used not only for protection purpose but for initiation of the machine
cycle as well. This will optimise the process and makes it safe. The control can be
realised either in single break or double break mode.
Single break:
Actuation and de-actuation of the light curtain initiates machine
movement.
Double break:
Two consecutive actuations and de-actuations of the light curtain
initiates machine movement.
The start and restart interlock function has to be used.
The reset button has to be operated under following conditions:
- Machine start
- Restart, after obstructing the light curtain during a hazardous movement
-
Restart, after exceeding the permitted time period of 30 s for machines having a
cycle time of less than 5 s.
The mode single or double break is allowed for small machines and light curtains with
detection capability of less equal 30mm only.
Always check that the hazardous zone can not be entered and the light curtains can
not be bypassed by operator.