Pi
n
2
Pi
n
4
Pi
n
4
Pi
n
2
K1
K2
0 V DC
0 V DC
Figure 22: Connection of multifunctional connections in protective operation without reset
and/or w
ithout EDM
4.4.2 Restart interlock
Overview
T
he safety light curtain has an internal restart interlock.
Depending on the regulations which apply at the place of installation, a restart interlock
may be required.
The restart interlock prevents the machine from automatically starting up, for example
after a protective device has responded while the machine is operating or after chang‐
ing the machine’s operating mode.
Important information
DANGER
H
azard due to unexpected starting of the machine
The machine may not restart if the OSSDs switch to the ON state once the reset push‐
button has been pressed. The control must ensure that the machine only restarts if the
machine start button is also pressed after the reset pushbutton.
b
Make sure that the machine can only restart once the reset pushbutton and start
button have been pressed in the specified order.
Operating principle
T
he restart interlock prevents the machine from automatically starting up, for example
after a protective device has responded while the machine is operating or after chang‐
ing the machine’s operating mode.
Before the machine can be restarted, the operator must reset the restart interlock.
4 P
ROJECT PLANNING
32
O P E R A T I N G I N S T R U C T I O N S | miniTwin4 8012624/10OM/2018-08-09 | SICK
Subject to change without notice
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