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- z& [5 F3 Q6 }/ M& u- vStandard(s)- (year and edition):
- {7 c% N& h) n- MIEC 60601-1:1988 Ed.2 Am1+Am2
$ i7 U$ T5 H' U1 j- [/ ~3 JSub clause(s):
6 j) e- Q2 q/ P1 R5 KSheet n°: DSH-412/ z+ c+ F) k7 {7 n: e
Subject: Detection of fault/ l- T; Q! M6 [% c" x
Key words: SFC, detection, fault" c: l; v$ d; G( S/ R: z
Confirmed by CTL at its 39th meeting, in Cologne
+ F4 ]2 f P9 |6 {Question:
g) N$ S# m" p3 F3 a" b: E$ r- q. cShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
+ g# I, e% o) M0 b" k( vSINGLE FAULT CONDITION (SFC)?
- d3 t. x. i# m9 ]9 D* Y$ FIf every fault is considered as SFC, regardless of whether it is detected or not, the
8 S$ u$ u2 ^0 H3 b$ `6 V/ nconsequence will be that there is no protection required against situations where an. }% M0 _' m, g1 t& {
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD., ]! \/ T {0 e- y( u
Decision:1 N M4 e- Y1 x! G- \
If a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it9 ^2 U- z# i+ t
shall not be considered as a SINGLE FAULT CONDITION.- Y) ]! p2 Z. v
Time periodicity for the detection of fault depends on the risk analysis0 E P! Y* ~6 F- y: h# b
( P5 N4 b1 L( V; l
- H" h1 t$ Y8 _! l1 v8 H4 N. D4 ~; k% F( ^( v5 H: y
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发表于 2012-11-5 11:27
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