DSH 440 Short-circuit of motor capacitors

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DSH 440 9 G* Q, |% v# E9 {6 l. D4 F& K

Short-circuit of motor capacitors   s4 B6 s$ e  j# I

19.7

60335-1(ed.3)

5 C& p$ J7 H' x- hStandard: IEC60335-1:1991, 3rd Ed.
: P5 G0 S$ |- p5 TSub-clause: 19.7
( ~  o- E1 i- @8 p) {% sSheet No. DSH-440
2 e) |$ D+ M; b/ Q8 M! I) M4 vSubject: Short-circuit of motor capacitors
/ x% \0 b" k1 k. K6 S2 _Key words: -short circuit   -motor capacitor
Decision taken at the 40th CTL meeting 2003.
Question:
: v/ M/ `! u" J4 H) t0 cTC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub
" _0 C' U9 B7 p% oclause 19.7 of IEC 60335-1.
3 [# c. V4 [: [. ZDecision:
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
3 Y& x4 p: k7 q, E0 n9 w4.3 that states “If it is evident from the construction of the appliance that a particular test is not
; S. X8 T7 `1 ^; l( \- lapplicable, the test is not made”.
- g) \2 T" X  D+ f  n. ]The followings are examples of the circuits.
+ w9 M0 \) e6 Y. k, [2 `. B( rIn the Example A:
& a9 r8 F; |- Q2 B; W2 S- U" KShort-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
- l( v  P* O; Q: Q3 K- Z* R# x9 bthe circuit is opened (the switch is opened).
Also short circuit of its terminals (Ca) when the motor starts is not necessary because it is
" S" \# a3 C, Y/ U3 a. l8 {# L& {already covered by the short-circuit of Cb terminals.
& ^3 @8 E: n7 g( C: ?( Q8 {In the Example B:
& @, O  N/ f3 z$ g' k4 v7 D/ \Only one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one
0 X% y; U6 z! Z4 b7 A5 ]% u/ g) Rcovers 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.
) t, ^! k3 L6 s+ y9 K9 P

7 ~: L3 \* ]8 D3 A1 j+ V6 d. W