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

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DSH 631A ! W5 ]7 [1 a$ a6 Y, i; F

Testing of abnormal conditions of dc motors in secondary circuits ( k5 Q6 r4 ^  p* s1 @

5.3.2, Annex B

60950-1(ed.1) & 60950-1(ed.2)

/ }0 A6 T3 P+ s/ Y6 M+ KStandard(s):
& a+ D; s1 P2 R. O# ]IEC 60950-1:2001 IEC 60950-1:2005
Sub clause(s):
8 f7 Z) ?7 U$ r# |3 S, S2 h5.3.2, Annex B
DSH
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Subject:
. R/ S! `; U$ p) r& WTesting of abnormal conditions of dc motors in secondary circuits.
Key words:
DC fan, overload, Annex B
" U6 C: B% B" D0 ~* g. v1 {Approved by the 45th CTL Plenary Meeting 2008
/ \. \6 Q6 \3 U1 s" h- f5 YQuestion:
. q' H, P  }4 A+ w+ O1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
; x) f1 y: _7 v+ y1 \! z6 h2. 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)?
Decision:
1 S6 `& v8 J/ z) ]- u1. 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.
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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