DSH 440 Short-circuit of motor capacitors

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DSH 440

Short-circuit of motor capacitors 5 l! U0 L  ~) [# E5 B! O; h9 H

19.7

60335-1(ed.3) 0 x! F$ M$ U2 D8 L; d

* @3 t  P4 t. r; x# WStandard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
! ~) W5 h* s) N& I. P  uSheet No. DSH-440
Subject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
) C! C/ g; P) F2 E' x1 aQuestion:
% f& C( {: W4 W' C* a1 ATC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
clause 19.7 of IEC 60335-1.
Decision:
; F+ C% Z8 V6 @If the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting
of the second capacitor, only one capacitor needs to be short-circuited. This is endorsed by the sub clause
# P, |. K# L; L7 F  A0 x4.3 that states “If it is evident from the construction of the appliance that a particular test is not
applicable, the test is not made”.
The followings are examples of the circuits.
In the Example A:
Short-circuit of capacitor (Cb) terminals is necessary according to the requirements. For the
2 ?: j6 i& M  t$ X+ Bcapacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
8 `# j1 v0 x. }( w. ?- m; athe circuit is opened (the switch is opened).
Also short circuit of its terminals (Ca) when the motor starts is not necessary because it is
, b3 k" J' }7 M) O$ ~already covered by the short-circuit of Cb terminals.
In the Example B:
# ?" Z4 h: {% E' A# \3 i- yOnly one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one
" j3 X' N/ `. E- ocovers the testing of the other one. Also the short-circuit of Ca terminals is not necessary
5 n, T: g8 E, o, `( w- Pbecause of the reason stated in the Example A.
2 F6 A3 {! q7 n+ ]8 M

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