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|  DSH 631A& F" O8 m9 X- ^3 _) a5 k* M
w. X( c$ ]- \8 S; T7 j: W, m | Testing of abnormal conditions of dc motors in secondary circuits2 y) n% L( C1 n7 M: e0 d8 {! Z
| 5.3.2, Annex B4 k/ v# \6 x- \7 @' w! J
| 60950-1(ed.1) & 60950-1(ed.2)) H5 q: u) ]; g1 w ?
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4 B$ R& Y$ v9 e3 kStandard(s):
6 F4 K+ W3 p' m1 [IEC 60950-1:2001 IEC 60950-1:2005
$ t0 q3 b2 ]4 I R* MSub clause(s):6 w/ Q g4 Z0 e- N! N: h( L
5.3.2, Annex B
8 q/ ?& ? ]+ i4 Y' w% cDSH, U! L# b$ h# H; a' {2 {
631A0 r: T1 Q5 ~2 q X7 v9 Q9 z2 y
Subject:* S! y" s. A" h: ^3 I5 r6 j' _: R
Testing of abnormal conditions of dc motors in secondary circuits.: J2 c) l6 l" v: x9 }: h- G) ^
Key words:
. i$ @+ G2 k. uDC fan, overload, Annex B
" K. i- c; B% U' Q4 yApproved by the 45th CTL Plenary Meeting 2008
6 s% T w v, V$ D% F: ] bQuestion:
) N) q7 ~& Z* |( r1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
! p. [! E3 l: r4 h9 s2. 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)?
( h; E* m, i+ e! o T3 cDecision:
; r0 o. j- A( l: ]& l1. 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.+ w: \9 j( v" ]% x; S$ B
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.
5 |5 C! N: P# O! T" K- ^0 z/ O6 L4 V, N! }( P" B
2 a9 A4 v2 N9 D# S1 Q
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发表于 2012-11-6 14:14
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