DSH 440 Short-circuit of motor capacitors

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DSH 440 # S* [# }7 L; }5 q* t$ R2 V

Short-circuit of motor capacitors

19.7

60335-1(ed.3)

. v5 |- l. K- p% n. `2 xStandard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
% q$ E1 z9 q- ^4 ~9 e' t( tSheet No. DSH-440
Subject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
Question:
TC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
- s- @  o7 ~5 }6 f4 x! [# Sclause 19.7 of IEC 60335-1.
Decision:
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
+ k& a. J; i& n- |; D4.3 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:
! E+ S' n9 n* R& I. I# b5 vShort-circuit of capacitor (Cb) terminals is necessary according to the requirements. For the
capacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
* }2 O( x( P; _' `: j& jthe circuit is opened (the switch is opened).
8 c& O. ]  Q1 o( O& [# LAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is
2 Q4 q! Q( N& m* D% y" q2 ?+ c( valready covered by the short-circuit of Cb terminals.
In the Example B:
* n/ K1 C4 F$ i+ @8 qOnly 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
$ K( V& h5 r6 ~* y/ |$ o* _because of the reason stated in the Example A.


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9 t, t& k, {% K7 P1 D% O