458 Verification and validation
Preconditions for validation testing
Validation testing is done for the entire and complete safety system. It is
recommended to do all the verification and validation tests so that the real load of the
application is connected to the motor. The whole safety system (for example,
emergency stop buttons, light curtains, etc.) must be installed, set-up, and the drives
commissioned and ready to use before the safety system can be tested. All safety
functions in use must be tested with each of the drive, and/or as a whole section of
drives (span of control of safety function).
Validation procedure
General
It is always the responsibility of the machine builder/designer/integrator to ensure that
the operation of all the required safety functions has been appropriately verified and
validated.
It is necessary to validate first the general settings of the FSO module and the safety
encoder (if in use) before the validation of the safety functions.
Always configure and validate the STO and SSE functions. An internal monitoring of
the FSO module can trigger the STO or SSE function even if you have not defined an
external request signal for them.
WARNING! The system must not be considered safe until the safety
functionality, which is necessary for safe use of the application based on the
risk assessment, is validated. Validation of each safety function must be performed
before the application is taken into the use.
The validation tests using the start-up checklists later in this section must be
performed:
• at initial configuration of the safety function
• after any changes related to the safety function (wiring, components, settings,
etc.)
• after any maintenance work related to the safety function.
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