DSH 440 Short-circuit of motor capacitors

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DSH 440

Short-circuit of motor capacitors

19.7

60335-1(ed.3) - ~$ k% r( G: l  Y! Z' E% O! D

$ J# |  L% j8 C$ j1 A; T9 m: H: qStandard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
  g2 _. ?% h( [% @& g7 PSheet No. DSH-440
, N8 y3 T2 q" p1 }" R  j& f0 z4 ISubject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
Question:
2 |0 P  a2 u% x2 hTC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
clause 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
4.3 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
capacitor (Ca), short-circuit of its terminals when motor is running is not necessary because
. h, a$ b. K, Ithe circuit is opened (the switch is opened).
+ x+ l8 ^9 ^! QAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is
* H1 d$ s+ g- q. N) j+ W3 D; Talready covered by the short-circuit of Cb terminals.
In the Example B:
  G6 ~, d; a! [- ^) [9 y7 BOnly 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.

: s" @$ \. A: l  F: F4 ~


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