DSH 440 Short-circuit of motor capacitors

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DSH 440 & n5 u! d# r. h3 Y7 o# ^2 }2 v" ?: V

Short-circuit of motor capacitors

19.7 ' y! |2 K$ H: M9 m

60335-1(ed.3) - v  I6 c/ }3 g# V0 a

Standard: IEC60335-1:1991, 3rd Ed.
6 V! m7 N! a3 a+ p3 o1 Y/ s0 BSub-clause: 19.7
Sheet No. DSH-440
5 z% P+ V2 U7 T" M( d( c  e; y# eSubject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
0 D  J; l; o/ p3 r2 W7 b& i0 f+ \Decision taken at the 40th CTL meeting 2003.
Question:
+ r9 u* J% E7 m" I& _; i( b8 b% i! yTC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
" e4 x( Y7 b# k) mclause 19.7 of IEC 60335-1.
( `7 p* k; n' Z5 uDecision:
4 s$ e" K' k" v* b! I* d  I8 S& [/ c5 |If the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting
% `* d  @' `" W$ Wof the second capacitor, only one capacitor needs to be short-circuited. This is endorsed by the sub clause
4.3 that states “If it is evident from the construction of the appliance that a particular test is not
applicable, the test is not made”.
% }% h+ X( g4 }. s# X7 a% ]. L5 k: t$ ]# hThe followings are examples of the circuits.
In the Example A:
Short-circuit of capacitor (Cb) terminals is necessary according to the requirements. For the
+ y. ~/ y1 l* F" e. K, V, Wcapacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
the circuit is opened (the switch is opened).
% V( ^/ z" k- s6 `$ Z! j. ~& N, r7 BAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is
already covered by the short-circuit of Cb terminals.
In the Example B:
0 E) E8 [3 ^, w  ]Only one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one
covers the testing of the other one. Also the short-circuit of Ca terminals is not necessary
because of the reason stated in the Example A.
$ ]0 y3 ?5 k0 R" p* l- j/ ?" t" Z
/ M9 V+ g; |; y( Y, v
5 Z# V7 z" x$ g9 `