DSH 440 Short-circuit of motor capacitors

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DSH 440

Short-circuit of motor capacitors   v, t/ F' V# [

19.7

60335-1(ed.3)

$ i' _& O! m8 c( RStandard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
Sheet No. DSH-440
Subject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
3 M0 D2 v8 z6 l- Z* oDecision taken at the 40th CTL meeting 2003.
) K, S& t# c; @9 }8 G  DQuestion:
TC 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
: Y0 N  u3 {5 iof the second capacitor, only one capacitor needs to be short-circuited. This is endorsed by the sub clause
4 i. e: E6 r4 j4.3 that states “If it is evident from the construction of the appliance that a particular test is not
/ P+ q, C2 A+ y0 |: |applicable, the test is not made”.
The followings are examples of the circuits.
3 g* b8 i" \# ?  c! g- G! {9 RIn the Example A:
$ A" q2 {  v- }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
; C' U8 f7 H4 Y; u( c9 W% _& ethe circuit is opened (the switch is opened).
Also 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.
5 D* R# Z8 M' t' [; kIn the Example B:
Only one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one
0 Q+ E" [( b* g0 d9 gcovers 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.


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