DSH 631A Testing of abnormal conditions of dc motors in secondary circuits

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DSH 631A 2 \$ g5 I9 I/ c

Testing of abnormal conditions of dc motors in secondary circuits * K. ^9 \8 y" }: Q: r; j9 N/ W7 l

5.3.2, Annex B 0 b5 N2 W0 |. q

60950-1(ed.1) & 60950-1(ed.2) 0 n" X" R/ }! s' d/ L( ^& V" R9 B

4 N! O7 [$ X- F0 [Standard(s):
4 o% o0 i" e  Y9 Z: `% o& `, N$ j6 I1 YIEC 60950-1:2001 IEC 60950-1:2005
* J. s/ r9 U6 ]6 g& j( NSub clause(s):
5.3.2, Annex B
DSH
631A
! f) C) T' [3 m, i, o7 Y6 ^Subject:
- l* G/ f5 @; \) a$ a( b9 f8 K$ _$ v9 n+ Y& TTesting of abnormal conditions of dc motors in secondary circuits.
Key words:
9 a- M  c" Z; e% W0 nDC fan, overload, Annex B
# ?( {) A& G1 @Approved by the 45th CTL Plenary Meeting 2008
Question:
. C& U0 z* b( d) Y1 C4 n1 i1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
6 K' A( K1 b: k' ?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)?
* |7 y- q$ `' I, n. mDecision:
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.
! j# c7 b& @& E( @* ?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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