6
Electrical installation
6.1
Safety
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 7: Dual-channel and isolated connection of OSSD1 and OSSD2
Avoiding any potential difference between load and protective device
If you connect loads to the output signal switching devices (switching 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 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.
6
ELECTRICAL INSTALLATION
18
O P E R A T I N G I N S T R U C T I O N S | IME2S
8023341/14TD/2019-08-08 | SICK
Subject to change without notice