User Manual

SAFETY
Safety handbook page - 10 -
PNSPO
3.4 Validation
The purpose of validation is to determine the level of conformity of the safety-related
parts of the control system to their specification within the overall safety requirements
specification of the machinery. Validation consists of executing tests and applying
analysis in accordance with the validation plan.
The design of the safety-related parts of the control system shall be validated.
The validation shall demonstrate that each safety-related part meets:
- All the requirements of the specified category
- The specified safety characteristics for that part, as set out in the design rationale.
The validation of the safety-related parts of control systems should contain the
following elements:
-
Selection of the validation strategy (a validation plan);
- Management and execution of validation activities (test specifications, testing
procedures, analysis procedures);
- Documentation (auditable reports of all validation activities and decisions).
The prEN 954-2 (Safety of machinery – Safety related parts of control systems –
Part 2: Validation ) defines the procedure of Validation and contains possible validation
for mechanical, pneumatic, hydraulic and electrical systems.
The principle of validation can be illustrated in a flow chart.
List of faults
PrEN954-2,
clause 6
START
General consideration
during design
EN954-1, clause 4
Documents
PrEN954-2
,
clause 3.3
Criteria for fault
exclusion
PrEN954
-
2, clause 6
Validation plan
prEN954-2, clause 3.3
Validation
guidelines
prEN954-2,
clause 3.1
Analyse
prEN954-2, clause 4
Is the
analyse
sufficient
?
Test
prEN954-2,
clause 5
Report
prEN954-2,
clause 3.4
Test
complete
?
END
NO
YES
YES
NO