Diagnostics Test - Siemens SINAMICS Series Operating Instructions Manual

Functional safety
13.6 Validating/checking the safety functions
13.6 Validating/checking the safety functions
Carefully check/test the safety functions after commissioning the system for the first time,
after carrying out any repairs and after each change to the machine/system, in particular the
feedback circuits.
These tests must be performed by qualified personnel who, on account of their technical
qualifications and knowledge of the safety functions, are in a position to perform the
acceptance test in the correct manner.
NOTICE
Components in the external feedback circuits
In external feedback circuits of the DCM, no additional components and / or functions may
be installed which are not part of the safety functions.
13.7

Diagnostics test

In order to ensure that the function of the switch-off signal paths comply with the require-
ments laid down in the applicable standards, regulations and guidelines, these must be
tested at regular intervals (diagnostics test interval, "Diagnostic test" in accordance with
IEC 61800-5-2). As a consequence, faults are detected in an acceptable time. The intervals
depend on the safety function and the desired/required SIL / PL, Cat.
The user must ensure that this test of the switch-off signal paths (test stop: activating and
deactivating an STO) is performed at regular intervals.
The external safety relay (e.g. 3SK11...), can, based on the feedback signals of the
SINAMICS DCM DC converter, detect possible faults/errors in the switch-off signal paths,
and trigger an STO in both channels. An error is thus detected and the system can be
repaired.
13.8 Relationship between the test stop interval and SIL or PL and Cat.
The hardware, the hardware structure and, where applicable, the software (when using
parameterizable or programmable external safety components), must correspond to the
required SIL / PL and Cat.
Also see the application examples in the previous sections of this document.
Test intervals required:
● SIL 2/PL d, Cat. 3: Test stop at least once per year
● SIL 3 / PL e, Cat. 3: As a minimum, a test stop every 3 months
● SIL 3 / PL e, Cat. 4: Test stop at least once per day
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SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A