DANGER
H
azard due to lack of effectiveness of the protective device
The protective device can become disabled if the system connection cable is connected
incorrectly.
b
Make sure (e.g. by routing the cables appropriately) that the system connection
cable can only be connected to the system connection of the protective device.
Prerequisites
•
T
he safety light curtain has been safely integrated into the control system and the
electrical system of the machine.
•
Mounting has been correctly executed.
Example: Isolated connection of OSSD1 and OSSD2
Figure 45: Dual-channel and isolated connection of OSSD1 and OSSD2
Avoiding any potential difference between load and protective device
If y
ou connect loads to the output signal switching devices (switching outputs) 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 connections of
these loads and those of the corresponding protective device separately and also
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 connections of the
loads and those of the corresponding protective device.
Figure 46: No potential difference between load and protective device
ELECTRICAL INSTALLATION 6
8023872/18YZ/2021-01-14 | SICK O P E R A T I N G I N S T R U C T I O N S | deTec4 Ex II 3GD
79
Subject to change without notice
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