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|  DSH 412* }* D5 q. B- k4 b' l
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| Detection of fault4 n# I$ d) T+ }* _5 i% m& Q7 Z
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$ B) Y4 Y5 G& T* H/ q5 W | 60601-1(ed.2);am1;am2
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" x- ~0 n' S" f6 @, R8 l$ TStandard(s)- (year and edition):
+ q$ }: r6 P4 ^5 e! I+ IIEC 60601-1:1988 Ed.2 Am1+Am2) ~% p5 i" K& l7 _8 p C
Sub clause(s):
8 p+ ~/ d- q! I3 x. I+ o3 wSheet n°: DSH-412+ r) i5 v: Q( v" _- a# |$ C" r/ Y/ {
Subject: Detection of fault. N9 h$ ^0 P* |& Z# ~( o6 o
Key words: SFC, detection, fault
`/ w* x; G: T5 {% I8 o& hConfirmed by CTL at its 39th meeting, in Cologne
0 ?# [% a9 [2 t* t2 V0 ^, q# gQuestion:
1 x. h% a4 `6 pShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a* L) A9 h* f9 ]) W
SINGLE FAULT CONDITION (SFC)?
E' j7 `1 i, Q% i" H: G. mIf every fault is considered as SFC, regardless of whether it is detected or not, the" k9 z& r" y2 Z/ q' k) j
consequence will be that there is no protection required against situations where an
6 g% F* l0 D$ b3 H' n Kundetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
$ Q- g; j: q% |Decision:8 M! Q" p3 x4 S$ @; e
If a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it% ^# V! J* P# M
shall not be considered as a SINGLE FAULT CONDITION.; f8 ?: g2 t' L9 ~: D0 d
Time periodicity for the detection of fault depends on the risk analysis, ?& o3 ~" T; w
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发表于 2012-11-5 11:27
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