Figure 23: Schematic representation of operation with restart interlock
T
he dangerous state of the machine (!) is brought to an end if the light path is inter‐
rupted (") and is not re-enabled (§) until the operator presses the reset pushbutton
located outside the hazardous area ($). The machine can then be restarted.
Depending on applicable national regulations, a restart interlock must be available if it
is possible to stand behind the protective field. Observe IEC 60204-1.
The following applies to the restart interlock:
•
If the protective field is clear once the machine has been switched on or following
an interruption, the OSSDs do not switch to the ON state
•
If someone presses the reset pushbutton and then lets go of it when the protec‐
tive field is clear, the OSSDs switch to the ON state
•
The machine may not restart yet. The operator must also press the machine start
button after having pressed the reset pushbutton.
Internal restart interlock and reset
A r
eset device (e.g., a reset pushbutton) must be connected to allow the restart inter‐
lock to be used.
Pi
n
4
Pi
n
2
+24 V DC
0 V DC
K1
K2
Pi
n
2
Pi
n
4
Figure 24: Electrical diagram of the reset device
T
he restart interlock is configured once the reset pushbutton has been connected.
Only one reset pushbutton may be connected to a single safety light curtain. A total of
just one reset pushbutton may be connected to a cascade comprising 2 or 3 safety
light curtains.
PROJECT PLANNING 4
8012624/10OM/2018-08-09 | SICK O P E R A T I N G I N S T R U C T I O N S | miniTwin4
33
Subject to change without notice
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