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

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DSH 631A ) C: P0 D. {& x: O7 e0 y

Testing of abnormal conditions of dc motors in secondary circuits 3 G3 Q4 H  s( ]: o% n0 |

5.3.2, Annex B / E) F9 G; X; o( g: |9 `

60950-1(ed.1) & 60950-1(ed.2) & U1 T0 {. X* c

Standard(s):
IEC 60950-1:2001 IEC 60950-1:2005
Sub clause(s):
5.3.2, Annex B
9 g+ W4 K& q6 x6 d7 zDSH
631A
Subject:
Testing of abnormal conditions of dc motors in secondary circuits.
Key words:
DC fan, overload, Annex B
4 P7 o- y- y" F0 R, {2 A; UApproved by the 45th CTL Plenary Meeting 2008
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)?
! S0 @6 j3 l( X3 K( i! F2. 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)?
1 V" G3 Z# n. V' F. M+ TDecision:
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.
! q6 y! {8 @* o% d8 z6 K) ]; _1 O2. 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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