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

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DSH 631A

Testing of abnormal conditions of dc motors in secondary circuits

5.3.2, Annex B % @5 _# f3 q, o. l8 `9 d) Y

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

- J9 b$ g  M; j; z) QStandard(s):
IEC 60950-1:2001 IEC 60950-1:2005
( c* h+ _" v8 M3 p3 ]% J9 pSub clause(s):
# Q2 [8 {4 |# Z8 @/ {6 U5.3.2, Annex B
& B& Q- W8 N/ Q4 B! x, y: sDSH
631A
* ?( m4 E- f1 xSubject:
, Y7 d! h( R6 JTesting of abnormal conditions of dc motors in secondary circuits.
' H5 U- K3 z" ?2 g4 }9 p$ JKey words:
DC fan, overload, Annex B
4 N2 u+ k* x1 D4 d  kApproved by the 45th CTL Plenary Meeting 2008
Question:
! D# t( B8 v9 z$ \. A+ l5 m1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?
* |7 _0 L- ]. b- C2. 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)?
& U6 I- G9 `4 j- e5 Q" a, |/ LDecision:
1 g6 G7 P. i" h1. 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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