Medc XB15 Manuel d'utilisateur télécharger pdf (Page 6)

02/15 © MEDC 2015

Under fault conditions the failure mode of the Beacon is a failure to provide a spherical visual warning

light. For the failure rate associated with this failure mode please refer to the table below.

Assessment of Functional Safety

This beacon is intended for use in a safety system conforming to the requirements of IEC61508.

Sira Test & certification Ltd has conducted a Failure Modes Effect and Diagnostic Analysis (FMEDA) of the DC

version of XB15 Xenon beacon against the requirements of IEC 61508-2 using a Proof Test Interval of 8760hrs.

The DC version of the beacon was considered to be the worst case.

The results are shown below and are based on Route 1H .

The beacon is classed as a Type B device

Proven in Use Summary Tab

Conditions of Safe use

The following conditions apply to the installation, operation and maintenance of the assessed

equipment. Failure to observe these may compromise the safety integrity of the assessed equipment:

1. The user shall comply with the requirements given in the manufacturer’s user documentation (This Safety

Manual and Technical manual) in regard to all relevant functional safety aspects such as application of use,

installation, operation, maintenance, proof tests, maximum ratings, environmental conditions, repair, etc;

2. Selection of this equipment for use in safety functions and the installation, configuration, overall

validation, maintenance and repair shall only be carried out by competent personnel, observing all

the manufacturer’s conditions and recommendations in the user documentation.

3. All information associated with any field failures of this product should be collected under a

dependability management process (e.g., IEC 60300-3-2) and reported to the manufacturer.

4. The unit should be tested at regular intervals to identify any malfunctions; in accordance with this safety

manual.

XB15 XENON BEACON

Safety Function of XB15 Xenon Beacon:

‘To provide a spherical visual warning light when required’

Architectural constraints:

Type B

HFT=0

SFF =

74.65%

Proof Test Interval

=8760Hrs

[4]

MTTR = 8 Hrs

[4]

SIL 1

Random hardware failures:

= 1.12E-05

= 6.62E-06

= 4.84E-06

= 3.43E-06

Probability of failure on demand:

PFD

AVG

=2.92E-02

(Low Demand Mode)

SIL 1

Probability of Dangerous failure

on safety function:

PFH = 6.62E-06

(High Demand Mode)

SIL 1

Hardware safety integrity

compliance

Route 1

Systematic safety integrity

compliance

Route 1

Systematic Capability

SC 2 (Ref to 56A24816B)

Overall SIL-capability achieved

SIL 1 (Low Demand)

SIL 1 (High Demand)

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Medc XB15 Manuel d'utilisateur Page 6

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