DSH 440 Short-circuit of motor capacitors

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DSH 440 9 G- N6 y5 _8 A$ p" J5 r

Short-circuit of motor capacitors / ]! M/ j; V- B

19.7 ( s/ q0 }. t) {

60335-1(ed.3)

Standard: IEC60335-1:1991, 3rd Ed.
Sub-clause: 19.7
$ P# l: W' \5 wSheet No. DSH-440
: S& G+ q7 j; m* w6 q+ D* }$ HSubject: Short-circuit of motor capacitors
Key words: -short circuit   -motor capacitor
, K- z$ J; ^& K6 O5 YDecision taken at the 40th CTL meeting 2003.
4 Z; o5 S  }7 v6 j, HQuestion:
6 a/ |: u; ]# @4 f- XTC 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
8 ^$ o) U/ p; \, P5 vof 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
# l, o9 u5 F4 Vapplicable, the test is not made”.
' t8 K; [+ t* y" @2 ZThe followings are examples of the circuits.
; t* K/ w$ L4 K: V+ Q5 sIn the Example A:
- J* L1 }* G6 V1 ~0 X" sShort-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).
9 g9 X  S. M9 G7 E" p2 }" NAlso 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.
In the Example B:
- u1 n, ?2 }7 D( S) Q8 sOnly one short-circuit, either Cb1 or Cb2 terminals, is necessary because the testing of one
6 M1 C$ V4 j- [3 z/ Y' }covers the testing of the other one. Also the short-circuit of Ca terminals is not necessary
( r4 B! d  l: \. G: e) g1 `because of the reason stated in the Example A.



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