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| DSH 631A
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| Testing of abnormal conditions of dc motors in secondary circuits
4 p2 h, f5 s5 B( { | 5.3.2, Annex B K# H* r( v5 Y
| 60950-1(ed.1) & 60950-1(ed.2)
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Standard(s):
! l# q% K4 ?+ c" `! r9 D/ \' s! U }' QIEC 60950-1:2001 IEC 60950-1:2005 R( T. N M( d2 h% ]# w ~5 `
Sub clause(s):* `3 q6 X- l6 f$ s' ~9 O
5.3.2, Annex B: C# ~+ G5 s" Y
DSH3 j. ~ L- Q- ?" ~( o
631A
4 l1 \$ `& t- f# b+ HSubject:
1 O: x; C! V1 r1 PTesting of abnormal conditions of dc motors in secondary circuits.) y& W6 v0 ]) ?- m/ U3 F+ V
Key words:
6 l, U4 k# M+ f, S( c& i0 O9 JDC fan, overload, Annex B
% r! Q: Y; L) P, E- A- l$ iApproved by the 45th CTL Plenary Meeting 2008! n# o2 j: y7 t* Z( k' M4 X" I3 M
Question:
% ^$ a( C- N4 ]1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?' ~, M. a& J8 p; B1 m/ Y
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)?/ H% z6 J" Y; [0 X1 J! m$ m
Decision:
. C) Y: C' H1 ~4 r# d2 n5 b1 `1. 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.
/ j2 t5 B. v5 b' X8 ]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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