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|  DSH 412
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" V$ C5 ]( Z3 ~% l" l* J | Detection of fault
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+ Y/ c8 M' I2 w. \- T! W. v | 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition): W# \ {4 @& Q/ h7 a, [2 ~' R
IEC 60601-1:1988 Ed.2 Am1+Am2
5 a% }% E! l3 j& X7 a$ HSub clause(s): U" `, |% p0 d5 \) c4 ^
Sheet n°: DSH-412( X) i N" x1 \! l
Subject: Detection of fault7 `; M* z0 Z- Y" t1 ?
Key words: SFC, detection, fault
5 v8 m2 }7 p% M* j# n* k! CConfirmed by CTL at its 39th meeting, in Cologne
. l2 a, A: _1 F: _& y6 |Question:" }2 N; A4 e0 d6 `
Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a* Z/ Q0 n" H- T9 C$ o7 m
SINGLE FAULT CONDITION (SFC)?
2 A, D8 J1 @1 g4 |If every fault is considered as SFC, regardless of whether it is detected or not, the' e! e. _; Y( s6 i# }2 U
consequence will be that there is no protection required against situations where an! z! K& E3 G. p# M X
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.: j A: h% d/ _" U, C
Decision:
8 e/ [7 d C: pIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it3 A" @3 a0 f# q0 A0 R. H
shall not be considered as a SINGLE FAULT CONDITION.
! M& K ?5 P5 |* k/ M7 O% O% {( V5 qTime periodicity for the detection of fault depends on the risk analysis4 d: [: l$ N' N4 Q* P
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发表于 2012-11-5 11:27
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