DSH 440 Short-circuit of motor capacitors

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DSH 440 : R' O) y5 c/ W

Short-circuit of motor capacitors . a; y' S/ q2 s' o) ^5 H

19.7   y$ y, w% `2 n: w2 y$ c

60335-1(ed.3)

5 {: l6 c+ h0 l( u+ i* cStandard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
Sheet No. DSH-440
1 d+ }2 v+ l/ y% |. m& v" RSubject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
6 I" W- G0 B3 B9 S# z) yQuestion:
TC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
" E. \0 ?$ `, s/ x' i# q" \clause 19.7 of IEC 60335-1.
+ K; P) s4 x7 b# CDecision:
! m+ Q* d" j4 S  T1 kIf the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting
- x# V, O2 d. z- c. L, F: ?1 L3 @of 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
, h* }, }+ r/ i: p# ^" ^1 z/ @) fapplicable, the test is not made”.
The followings are examples of the circuits.
- k1 n/ D. x4 v. `; C. i+ gIn the Example A:
Short-circuit of capacitor (Cb) terminals is necessary according to the requirements. For the
0 k7 I) K5 M6 K; V0 f# O5 kcapacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
5 Y  m( F3 q6 e% {( I" uthe circuit is opened (the switch is opened).
" x- W& y, v/ B" IAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is
' k2 p3 p2 z1 M$ `already covered by the short-circuit of Cb terminals.
( ~% n3 |+ w/ BIn the Example B:
1 H$ N, z, H4 g2 x4 O" ZOnly 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.


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