|
|
|  DSH 412- ~$ [% W* o, d( S( J
7 j$ d4 l$ S! `# T* S% A. y
| Detection of fault
0 m0 F' {) C7 C7 f1 K5 { | -& ~& W; g. b0 S$ z& ~" m! l
| 60601-1(ed.2);am1;am2. E7 J' S# Y6 I. D' o- L
|
# r% f0 d9 M; s1 k5 l2 {* @/ bStandard(s)- (year and edition):
1 D) K# ^: \* `% G9 |9 P% |" GIEC 60601-1:1988 Ed.2 Am1+Am2
$ P9 ^$ n7 Q9 |1 b" D. a* c, ^( LSub clause(s): 7 h% Q! L" |) I; q o+ Y5 K
Sheet n°: DSH-412 |9 P3 K' q4 W Q" |9 e3 p
Subject: Detection of fault
& z8 M' K! k7 h8 D5 rKey words: SFC, detection, fault
* i9 z$ b( Y8 { b( e* S5 o; gConfirmed by CTL at its 39th meeting, in Cologne3 z8 [( y# y( D$ _: D
Question:
. @; Y& o; m* x1 B$ f4 LShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a; y% p) ?/ B. Y
SINGLE FAULT CONDITION (SFC)?4 [: W& B$ s" \; W9 t
If every fault is considered as SFC, regardless of whether it is detected or not, the
5 ]. K# v) v1 d* f/ l. V# E* tconsequence will be that there is no protection required against situations where an8 N0 `% u8 y! p' Z" A. `4 n
undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.
5 u3 n3 ~2 G" X0 }* PDecision:
5 ~% ~* _) U' YIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it! |. y9 Q* _* o/ i7 W1 g
shall not be considered as a SINGLE FAULT CONDITION.
& C) X# I7 |& s" c: m% S: d* f0 dTime periodicity for the detection of fault depends on the risk analysis X2 I7 T, u$ R" \+ N+ j' F. W9 v
6 z i4 H8 D4 S4 V& i6 O4 E, M0 w( u* l {; {3 s I1 D) \
, h- E% _& z5 k$ V1 u# Z" ~5 s# d
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-5 11:27
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡