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Entry type: FAQ Entry ID: 109762943, Entry date: 02/13/2019
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Conversion from expiring safety relays (e.g. 3TK28) to their successors (e.g. 3SK)

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This entry contains information about expiring safety relays (e.g. 3TK28) to their successors (e.g. 3SK).

QUESTION:

What needs to be considered when converting expiring safety relays (e.g. 3TK28) to their successors (e.g. 3SK)?




ANSWER:

When replacing safety-relevant components by their successors the safety calculation (as a part of the plant documentation) must be adjusted.
At this it is usually sufficient to exchange the safety characteristics of the expiring product (3TK28) in the existing calculation by the safety characteristics of the successor (3SK). This applies both for new plants and spares parts.

Detailed help for the conversion of 3TK28 to 3SK can be found in the following FAQs:

Applicative conversion from 3TK28 to 3SK1 safety relays:
Entry ID: 66276467

Procedure for the conversion of 3TK2826 safety relay through 3SK2 safety relay:
Entry ID: 109741483

Application for conversion 3TK2845 to 3SK:
Entry ID: 109747906