Safety systems - General information
4.3 Basic terminology
3SK1 safety relays
Manual, 04/2013, A5E02526190021A/RS-AA/01
37
4.3.12
Startup testing
The sensor or protection equipment must be opened and closed again after the supply
voltage is restored before the enables for the 3SK1 safety relay can be switched through.
Startup testing ensures that any errors in the sensors are detected (again), because safety
relays lose their ability to store errors at zero voltage.
Unauthorized manipulation of the protection equipment can also be detected through startup
testing.
The plant operator decides whether startup testing should be performed (risk assessment).
No general statements apply.
Note
In the delivery state of 3SK1 safety relays, startup testing is deactivated.
4.3.13
Connection of actuators
Note
To achieve the Performance Level / Safety Integrity Level given in the following examples,
the actuators shown must be monitored in the feedback circuit of the corresponding safety
relay.
Note
For capacitive and inductive loads, we recommend an adequate protective circuit. In this
way, electromagnetic interference can be suppressed and contact service life increased.
You can find more information in the SIRIUS Innovations - SIRIUS 3RT2
Contactors/Contactor Assemblies manual
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Summary of Contents for SIRIUS 3SK1
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Page 10: ...Table of contents 3SK1 safety relays 10 Manual 04 2013 A5E02526190021A RS AA 01 ...
Page 186: ...Commissioning 3SK1 safety relays 186 Manual 04 2013 A5E02526190021A RS AA 01 ...
Page 258: ...Accessories 3SK1 safety relays 258 Manual 04 2013 A5E02526190021A RS AA 01 ...
Page 260: ...Appendix A 1 Correction sheet 3SK1 safety relays 260 Manual 04 2013 A5E02526190021A RS AA 01 ...
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