Short-circuit of motor capacitors' f4 e' U& q0 s! G7 \
19.7 % f; X0 @/ i1 j) v/ c
60335-1(ed.3)* [; f) R7 x. _& ?( l
$ x+ q0 Q/ l: \- p/ H4 iStandard: IEC60335-1:1991, 3rd Ed. 6 N/ H/ F: R& w! k( SSub-clause: 19.7 ) B' B) J) u, p- KSheet No. DSH-4403 K' R; O* S( O8 _' k, v
Subject: Short-circuit of motor capacitors . _+ H. S% j% y1 VKey words: -short circuit -motor capacitor+ }. V5 G; n# W' z) n1 V( [
Decision taken at the 40th CTL meeting 2003.; g; R1 U4 {7 T, L, Z/ ~
Question:+ g! k. i) y) G, `* m- l
TC 61 requested CTL to clarify the test procedure for short-circuiting capacitors in accordance with Sub 7 P) Y# P) X5 ]* m3 {8 P) P$ b6 Xclause 19.7 of IEC 60335-1.1 p( {9 d# d* L1 M3 _
Decision: 5 [- e) ]' q% G0 _0 _If the design of the circuit is such that short-circuiting of one capacitor will result in the short-circuiting % l- R4 ?- f, }5 k9 rof the second capacitor, only one capacitor needs to be short-circuited. This is endorsed by the sub clause: D/ R% ^2 x. r' _% L' ~
4.3 that states “If it is evident from the construction of the appliance that a particular test is not & k, m. }1 z' E6 U1 ^$ U3 i/ Bapplicable, the test is not made”. - Z" H- S; J1 o2 k$ UThe followings are examples of the circuits.# `6 I# d7 [; z, a5 l% v$ U
In the Example A: ! x; n9 ~% g1 a$ ^# C: {- X# JShort-circuit of capacitor (Cb) terminals is necessary according to the requirements. For the! L& T$ K2 a/ N7 \, V$ D
capacitor (Ca), short-circuit of its terminals when motor is running is not necessary because& J/ n c$ s1 v9 I: ]
the circuit is opened (the switch is opened). 7 F5 K: o* r; `2 q5 ?5 EAlso short circuit of its terminals (Ca) when the motor starts is not necessary because it is+ @3 |3 X9 r( s
already covered by the short-circuit of Cb terminals. / V6 I1 P; L% G6 t. b& hIn the Example B: + D( z5 @7 K( v6 POnly one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one 9 Y8 d9 l; C: ~4 C- B, `covers the testing of the other one. Also the short-circuit of Ca terminals is not necessary; l7 N/ ]4 \/ A! c8 {8 p; l% F# q
because of the reason stated in the Example A.- x; i+ J! P9 Q# t
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DSH 440: j( U3 \ v& u