•
A r
estart interlock must be implemented depending on applicable national regula‐
tions or required reliability of the safety function. Because the protective device
does not have an integrated restart interlock, this must be implemented in the
external control, if required.
•
When using a safety controller, different signal levels of both OSSDs must be
detected depending on applicable national regulations or required reliability of the
safety function. The maximum discrepancy time tolerated by the controller must
be selected according to the application
•
The OSSD1 and OSSD2 output signals must not be connected to each other.
•
In the machine controller, the signals of both OSSDs must be processed sepa‐
rately.
Figure 16: Dual-channel and isolated connection of OSSD1 and OSSD2
•
T
he machine must switch to the safe state at any time if at least one of the two
OSSDs switches to the OFF state
•
Prevent the formation of a potential difference between the load and the protec‐
tive device. If you connect loads to the OSSDs (switch outputs) that then also
switch if controlled with negative voltage (e.g., electro-mechanical contactor with‐
out reverse polarity protection diode), you must connect the 0V connections of
these loads and those of the corresponding protective device individually and
directly to the same 0V terminal strip. In the event of a fault, this is the only way to
ensure that there can be no potential difference between the 0V connections of
the loads and those of the corresponding protective device.
Figure 17: No potential difference between load and protective device
4 P
ROJECT PLANNING
24
O P E R A T I N G I N S T R U C T I O N S | deTec4 Core Vibes 8024467/1GWF/2022-11-11 | SICK
Subject to change without notice
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