Figure 18: No potential difference between load and protective device
DANGER
H
azard due to unexpected starting of the machine
A restart interlock must be implemented depending on applicable national regulations
or required reliability of the safety function.
b
Make sure that a restart interlock is implemented.
DANGER
H
azard 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 applic‐
able 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
Bo
th outputs are short-circuit protected to 24 V DC and 0 V. When the protective field is
clear, the OSSDs are in the ON state. When a switch-off condition is present (e.g., inter‐
ruption in the light path), the OSSDs are in the OFF state. In the event of a device fault,
at least one OSSD is in the OFF state.
The safety light curtain complies with the rules for electromagnetic compatibility (EMC)
for the industrial sector (Radio Safety Class A).
NOTE
Usin
g the device in residential areas may cause radio interference. The operating entity
is responsible for taking appropriate measures (e.g., shielding).
DANGER
H
azard 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.
b
Make sure that the following control and electrical requirements are met so that
the safety light curtain can fulfill its protective function.
PROJECT PLANNING 4
8022883/2019-03-07 | SICK O P E R A T I N G I N S T R U C T I O N S | deTec4 Ex
33
Subject to change without notice
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