6
Electrical installation
6.1
Safety
Overview
You can directly integrate the safety switch into the machine controller via the safety
outputs (OSSDs). The OSSDs indicate the ON state with the HIGH signal level (non-iso‐
lated). The OFF state is indicated with the LOW signal level.
Downstream control elements must evaluate the output signals of the protective device
in such a way that the dangerous state of the machine is safely ended. Depending on
the safety concept, the signal is analyzed by, e.g., safety relays or a safety controller.
Important information
DANGER
Hazard due to electrical voltage
Hazard due to unexpected starting of the machine
b
Make sure that the machine is and remains disconnected from the power supply
during the electrical installation.
b
Make sure that the dangerous state of the machine is and remains switched off
during electrical installation.
b
Make sure that the outputs of the safety switch have no effect on the machine
during electrical installation.
DANGER
Hazard due to lack of effectiveness of the protective device
The dangerous state may not be stopped in the event of non-compliance.
b
Always connect the two OSSDs separately. The two OSSDs must not be connected
to each other.
b
Connect the OSSDs such that the machine controller processes both signals sepa‐
rately.
Isolated connection of OSSD1 and OSSD2
Figure 12: Dual-channel and isolated connection of OSSD1 and OSSD2
ELECTRICAL INSTALLATION
6
8018754/12IU/2020-01-30 | SICK
O P E R A T I N G I N S T R U C T I O N S | STR1
23
Subject to change without notice
