|
|
, R8 b, ?& |4 m, b
Standard: IEC60335-1:1991, 3rd Ed.
' J& B; Q# R7 b1 Y+ aSub clause: 19.11.2 b* Q1 F; `/ e
Sheet n°: DSH-441A( v% \8 e4 r# r0 _) ]9 n% J) F
Subject: Sheathed Heating Elements5 A% d, |8 v& Z2 s
Key words: - Abnormal, sheathed element - Protective electronic circuit
, c: A8 v/ }8 sDecision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005- t, U, d. e# l4 ?: R8 L0 b& G' ]5 L4 i
Question: Some appliances have the following circuit& `8 @: L6 t2 S1 ~& q$ M# n1 k1 k6 {
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
: s" z8 K: d; s, U2 F6 v- iclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as7 a& m! z1 E5 V0 m: M+ W: G/ D
in a) through f) of cl.19.11.2
4 \ Q6 J2 Y1 d( |' C, gIn our opinion (VDE), an additional mechanical thermal cut-out is required.
; |# n7 m. f3 m; `9 b# D8 U3 NConvenors note:5 z, ^$ T9 h/ K1 Q3 _, i8 Y
In clause 19.5, the electronic thermostat will operate to limit the temperature in one6 e" n& L* \, u& f
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
/ {; l" E5 d4 v; ^: }$ oadditional cut out required to comply with 19.5; ]; S3 q3 x4 T& J3 J% Z
Decision:1 k" f0 X/ z5 [/ K
An additional thermal cut-out is required
3 L% M9 a, _7 F" Q* ]Note: This is only applicable to the above mentioned standards and is not applicable to1 v" \/ I% {: z; K v5 f" j
IEC60335-1(4th Ed. with Amendment 1). `$ F9 r( D @& q3 ~) `
) r; G$ E* A2 @, M, N
5 W9 [9 p7 S4 c2 \; z* X |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-9-14 13:03
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡