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| DSH 631A: l; S+ Y6 }( @1 F) _1 m3 ?/ [
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| Testing of abnormal conditions of dc motors in secondary circuits9 Z: _4 `0 b' Z& @+ j: S3 T5 V: q
| 5.3.2, Annex B* p1 f- t9 w8 o, @3 j
| 60950-1(ed.1) & 60950-1(ed.2)
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Standard(s):
! S5 {# l9 Q8 C- ~* F/ Y' RIEC 60950-1:2001 IEC 60950-1:2005
! d3 V- v( l LSub clause(s):
5 x' K) l& A7 Y+ M \( v7 e6 p5.3.2, Annex B, S% r" a/ @7 A
DSH
, x, P2 h6 w2 h. s% M0 N631A7 I! [4 A6 B; q# R1 R% _$ |* Q: M& y
Subject:
$ D1 |; i2 F3 w" U& R+ d* ~Testing of abnormal conditions of dc motors in secondary circuits.
8 G! S# F; Y2 FKey words:
' P1 N5 \- `2 @DC fan, overload, Annex B+ v; E, E( ^$ j% e! I+ l7 G
Approved by the 45th CTL Plenary Meeting 2008
4 \& ^- R* I' _( z! hQuestion:4 p! ~8 _& m( G) ^- a# l# Y. z7 B
1. Is the test as described in Annex B.6 required for small dc motors (e.g. fans used in notebooks or power supplies)?9 d- D* M; z5 u" r) B% y% T
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)?& `9 R7 n ]: Z4 y$ U
Decision:
* [* M9 N- g7 f( \% Y1. 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.
+ t. M- v- q7 r& m: r0 ^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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