SICK STR1

6 Electrical installation
6.1 Safety
Overview
Y
ou 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
H
azard 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
H
azard 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