SICK TR10 Lock

Figure 8: Dual-channel and isolated connection of OSSD 1 and OSSD 2
•
The machine must switch to the safe state at any time if at least one OSSD in an
OSSD pair 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 (safety outputs) that 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 individually 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 connections of the loads and
those of the corresponding protective device.
Figure 9: No potential difference between load and protective device
DANGER
Hazard due to lack of effectiveness of the protective device
In the case of non-compliance, it is possible that the dangerous state of the machine
may not be stopped or not stopped in a timely manner.
Downstream contactors must be positively guided and monitored depending on appli‐
cable national regulations or required reliability of the safety function.
b
Make sure that downstream contactors are monitored (external device monitoring,
EDM).
Requirements for the electrical control of the machine
The OSSDs are short-circuit protected to 24VDC and 0V. When the safety locking
device is locked, the OSSDs signal the ON state with the HIGH signal level (non-iso‐
lated). If the safety locking device is unlocked or there is a device fault, the OSSDs
signal the OFF state with the LOW signal level.
PROJECT PLANNING 4
8019972/1CS1/2022-07-20 | SICK O P E R A T I N G I N S T R U C T I O N S | TR10 Lock
17
Subject to change without notice