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|  DSH 631A2 U0 k# |/ |- p
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| Testing of abnormal conditions of dc motors in secondary circuits' T+ P n9 S: K% h. `+ D7 W0 h
| 5.3.2, Annex B7 T& z' G+ ^' T% {" i
| 60950-1(ed.1) & 60950-1(ed.2)9 B& Y- y! o. Y: G
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2 W% E% k3 |( [0 rStandard(s):: B; B3 [! f. P y. V
IEC 60950-1:2001 IEC 60950-1:2005
& C! D( u' g# KSub clause(s):- X% ~7 C( y7 }) L0 Z: E6 K
5.3.2, Annex B9 p2 o8 `0 ^ @+ Y& Z0 a$ O5 U
DSH9 w7 l( l' @" B1 T2 N6 v8 `9 h
631A) j! [6 z \8 V- u4 Y; G
Subject:9 M& U7 k0 s1 h1 c) w% t1 n `
Testing of abnormal conditions of dc motors in secondary circuits.
# ~2 X/ q! K( u$ L( z# lKey words:& m: x! a' `! U: w
DC fan, overload, Annex B/ o8 W5 {2 W t. o5 n; [7 L
Approved by the 45th CTL Plenary Meeting 2008& b; h r, j( d$ }9 m2 D- w- a
Question:5 ~7 X, j8 k; [3 `
1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?+ \0 Z" x- G8 x# h2 b
2. Is it permitted to skip the limit temperatures of Tables B.1 and B.2 for dc motors in SELV circuits (following the second dashed paragraph of NOTE to subclause 5.3.2)?5 I9 q' u: K, I9 j- r
Decision:
- i5 S- Y5 X, ?/ E2 v1. Yes, the test is required, except for motors associated with air handling (fans). Note -This is in line with the proposed modification of B.1 for Amd.1 to IEC 60950-1.7 p; J$ w D3 a- {% o$ o
2. Yes, it is permitted for such dc motors to exceed the limit temperatures of Tables B.1 and B.2 during tests of subclauses B.6 and B.7.
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发表于 2012-11-6 14:14
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