DSH 440 Short-circuit of motor capacitors

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DSH 440 4 P) S4 c5 z% r

Short-circuit of motor capacitors

19.7 - K+ @) I+ v: b- v

60335-1(ed.3) $ M+ H3 _; i- m

Standard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
2 H: Q, }' R  s6 {/ ^1 U- M' u" o: l* OSheet No. DSH-440
Subject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
. ]4 O% W8 ?* v* O' iQuestion:
TC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
clause 19.7 of IEC 60335-1.
) e# a. z& W" K$ fDecision:
5 G4 B" ~" H/ ?. q. z* WIf the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting
4 M8 y3 J$ y4 E1 C, g! b8 gof the second capacitor, only one capacitor needs to be short-circuited. This is endorsed by the sub clause
% Y3 s" y: p$ N/ ^4.3 that states “If it is evident from the construction of the appliance that a particular test is not
2 {) _( i" C+ P& e$ uapplicable, 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
% j  [& Z+ e7 |2 X- ycapacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
+ h) D7 S) Y& C& U! E/ mthe circuit is opened (the switch is opened).
( m, d5 {. q' s! T4 L& oAlso 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:
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.
2 p. i! T5 z( o8 {% G

7 |8 T0 Z) t& Q0 J4 t4 S, z

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