Prerequisites
•
The multiple light beam safety device has been safely integrated into the control
system and the electrical system of the machine.
•
Mounting has been completed correctly.
Example: Isolated connection of OSSD1 and OSSD2
Figure 33: Dual-channel and isolated connection of OSSD1 and OSSD2
Avoiding any potential difference between load and protective device
•
Prevent the formation of a potential difference between the load and the protec‐
tive device. If you connect loads to the OSSDs (output signal switching devices)
that then also switch if controlled with negative voltage (e.g., electro-mechanical
contactor without reverse polarity protection diode), you must connect the 0 V con‐
nections of these loads and those of the corresponding protective device individu‐
ally and directly to the same 0 V terminal strip. In the event of a fault, this is the
only way to ensure that there can be no potential difference between the 0 V con‐
nections of the loads and those of the corresponding protective device.
Figure 34: No potential difference between load and protective device
Further topics
•
"Integration in the electrical control system", page 35
ELECTRICAL INSTALLATION
6
8024782/2019-11-19 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTem4 A/P
61
Subject to change without notice