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|  DSH 412
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1 }! A! w6 |4 N, o3 j! [" W6 K | Detection of fault$ x. S$ I% `1 p$ |# w. x- ~1 I8 |* B
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2 \. R# c, s$ l9 e$ P | 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):4 s4 F6 I+ z/ `, s8 [! n
IEC 60601-1:1988 Ed.2 Am1+Am2
: H, R7 ?6 D2 |) i+ v& ~Sub clause(s):
`. P2 K4 G0 R6 }; Q0 M3 hSheet n°: DSH-412
$ z5 l% E) k E$ L) BSubject: Detection of fault
" P$ G+ m1 `9 S% @. _Key words: SFC, detection, fault; t1 j4 w) O3 o- Y( T! K) x+ d0 {: t
Confirmed by CTL at its 39th meeting, in Cologne
' H# R+ X2 L J/ H2 jQuestion:$ r2 {, A0 o1 L$ H6 [& Q, T0 [
Shall a fault which remains undetected be considered a NORMAL CONDITION (NC) or a
6 m* c4 E n0 @6 m5 fSINGLE FAULT CONDITION (SFC)?
2 l9 t2 i0 @7 w" K fIf every fault is considered as SFC, regardless of whether it is detected or not, the' q+ L" W9 O% c' O( C# c* W, C
consequence will be that there is no protection required against situations where an
& |* t Q/ T/ q6 \7 [undetected first fault is followed by a second fault which may cause a SAFETY HAZARD.2 I( R% M. H2 u: e, N, N: d7 s! g
Decision:
+ Y8 {1 y/ Z8 W* }4 P0 I3 S' mIf a fault is not detected (for example by periodic inspection, maintenance, auto test, etc....), it$ U- J6 l$ Z) |8 i% j$ S
shall not be considered as a SINGLE FAULT CONDITION.
) U$ F. U" d, K" sTime periodicity for the detection of fault depends on the risk analysis" C: L# u- P5 u- t: f) u! j- j
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发表于 2012-11-5 11:27
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