DSH 440 Short-circuit of motor capacitors

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DSH 440 9 Z; a# J1 y6 b1 V% ]' A

Short-circuit of motor capacitors

19.7

60335-1(ed.3) % A/ g3 y- N5 d) d& [

) N! V0 l2 m* [8 z& _3 i$ c9 |Standard: IEC60335-1:1991, 3rd Ed.
( ~% [: q8 \/ {5 zSub-clause: 19.7
% W0 ]! H: t5 @3 Y2 h, `Sheet No. DSH-440
Subject: Short-circuit of motor capacitors
* l, E" _! g* U# K3 z5 f/ ^Key words: -short circuit   -motor capacitor
$ J9 S8 x. C) l' D" |- M+ HDecision taken at the 40th CTL meeting 2003.
& g% O5 Y6 S9 i- l" O/ T+ dQuestion:
; h# e8 ?) C' sTC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
0 z9 B' d& q( F0 Mclause 19.7 of IEC 60335-1.
, T* u' r) I( {Decision:
If the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting
& F* h, o4 l, Q* u4 z" G  Iof 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
( k9 v0 ^2 K/ B7 y1 F+ Q0 _6 ]9 Japplicable, the test is not made”.
: `$ ^5 D2 Q: f$ L# ^The followings are examples of the circuits.
In the Example A:
- M. |+ W0 @2 Q5 lShort-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
the circuit is opened (the switch is opened).
& `/ X& s8 ^/ s4 _* T" i- Z8 GAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is
; l9 b4 y9 @" H; g! }1 Balready 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
# ~; P3 w0 O$ G; B1 E: v+ J3 ccovers the testing of the other one. Also the short-circuit of Ca terminals is not necessary
$ J- u% U6 r8 a' m0 w* d0 r. mbecause of the reason stated in the Example A.


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