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Verification and validation 487
Proof test intervals during operation
Proof tests are intended to ensure that the safety integrity of a safety system is
maintained continuously and does not deteriorate over time. Proof tests are often
required for mechanical brakes, for example. Proof tests are used mainly for parts of
the system that cannot be automatically diagnosed.
The proof test interval is the interval between two proof tests. When the proof test
interval has elapsed, the safety system has to be tested and restored to an "as new
condition". The proof test must also be part of the regular maintenance plan.
For some of the components (electronics), the proof test interval is the same as the
expected life time of the system.
A specific safety calculator software can assist in determining the requirements for
the proof tests.
Residual risks
The safety functions are used to reduce the recognized hazardous conditions. In
spite of this, it is not always possible to eliminate all potential hazards. Therefore the
warnings for the residual risks must be given to the operators.
Содержание FSO-21
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Страница 4: ......
Страница 16: ...16 Safety instructions ...
Страница 34: ...34 Safety information and considerations ...
Страница 52: ...52 Overview ...
Страница 236: ...236 PROFIsafe ...
Страница 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Страница 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Страница 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 286: ...286 PROFIsafe ...
Страница 304: ...304 Installation ...
Страница 400: ...400 Configuration ...
Страница 488: ...488 Verification and validation ...
Страница 506: ...506 Fault tracing ...
Страница 514: ...514 Maintenance ...
Страница 536: ...536 Technical data ...
Страница 538: ...538 Dimension drawings 3AXD50000018513 ...