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|  DSH 412; I7 V0 p) M* g& V2 ^
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| Detection of fault
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| 60601-1(ed.2);am1;am27 L4 t( W+ t0 |* `' P* q8 x
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9 R, ? E/ `0 EStandard(s)- (year and edition):4 J( e4 D" [! w! E: y L
IEC 60601-1:1988 Ed.2 Am1+Am2
( ^3 W( y9 t6 d4 i) ], ]Sub clause(s):
8 g7 e' O6 i5 R$ V3 s7 KSheet n°: DSH-4123 ^. U% z; X# j
Subject: Detection of fault2 Z8 H- j: b1 ?& s8 Y: ^ `3 J
Key words: SFC, detection, fault" w4 j+ N n( A0 X6 b
Confirmed by CTL at its 39th meeting, in Cologne
- k1 i5 J9 b8 K1 b( m& R4 RQuestion:
& a! ^$ j4 V7 A Q4 i' z( R! `) MShall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
- S4 u4 S" b! Y$ V1 n, [SINGLE FAULT CONDITION (SFC)?
- F+ d6 L+ W0 oIf every fault is considered as SFC, regardless of whether it is detected or not, the
3 j5 M$ z8 `$ R1 E. d- O- Zconsequence will be that there is no protection required against situations where an
c5 c O( y" Z+ [0 h m$ Cundetected first fault is followed by a second fault which may cause a SAFETY HAZARD.$ a, M; }' ?, g& K1 _ V! U
Decision:
- `' d2 g9 f: I2 _' c/ E' a/ `0 lIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it' K9 V& M _1 z# p
shall not be considered as a SINGLE FAULT CONDITION.) ]# [3 _. p) ?! w8 J- D+ p7 S* `6 t: ]
Time periodicity for the detection of fault depends on the risk analysis
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发表于 2012-11-5 11:27
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