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

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DSH 631A   C) ^) I+ H3 g% Q9 [3 h" m

Testing of abnormal conditions of dc motors in secondary circuits + o9 M) O' ]" @/ G1 ]& @; A

5.3.2, Annex B 7 w% V5 E% ]1 {4 w

60950-1(ed.1) & 60950-1(ed.2) . F1 D+ n5 ^. N1 i

- U" Y5 G  j. I7 R% R  aStandard(s):
IEC 60950-1:2001 IEC 60950-1:2005
! r' H  s6 S) W0 m! \) [Sub clause(s):
5.3.2, Annex B
2 d4 B! T( \  @$ e% {DSH
/ X3 E& l# W+ z1 G2 H% B; Z- _631A
( b3 {/ {# \6 H4 |, G8 K% B) VSubject:
1 [$ b3 f; w1 Q) a/ ITesting of abnormal conditions of dc motors in secondary circuits.
Key words:
DC fan, overload, Annex B
/ I1 Y" p$ ]0 J' jApproved by the 45th CTL Plenary Meeting 2008
2 b! H! D, j' \/ i. O+ x2 _Question:
1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
/ t1 i% r. ?5 _4 I2. 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)?
( L! j! j7 x9 T0 PDecision:
* c: a! F$ A, C: y9 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.
" u# f. X7 o8 s5 o$ K4 {5 r2. 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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