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20 Functional safety (EBLF)
% @ V X' E5 U$ SThe appropriate lamp associated to the ballast shall provide the necessary light output after
( c/ P/ h e. Mchange over to the emergency mode. This is verified if the declared Emergency ballast lumen! V% ^7 B2 u) ~( m5 x
factor (EBLF) is achieved during emergency operation at 25 °C.
; e6 \' U' h! {+ e% [Compliance is checked by the following test:
2 j) _1 e' ^5 v4 N( q/ J+ S8 w0 ba) ballast provided with batteries:3 c5 Z8 J- y1 J* T& w" R7 p
The voltage supplied to the ballast by the batteries is continuously measured during$ l5 v. d# W+ H5 G0 h+ P* E
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
" Z9 F; {9 P& |4 `2 H ivalues measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after, k* w4 Q1 h' X1 {0 I8 A4 Y
failure of the normal supply and the end of rated duration of operation are retained for the
4 h8 |$ u8 j% X! }; b J& ~) BEBLF measurement.* O5 u$ Q, l6 P7 B( y4 N7 p8 V
b) ballast not provided with batteries and designed for d.c. central supply system: a2 t% K# W+ @- @' u( `) S
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are0 }4 ], o* ~" p- a' ~5 t
retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the" e- \' [0 n( R
rated voltage (V1) unless specifically advised of a different value by the control gear
8 p8 ^! j# k) O- Mmanufacturer.
& r" @2 V4 A! H- V- H0 cNOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause% \; X- D# s; @1 F9 s9 {
22.16.1/ _' W7 x* E' I& N1 S
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
& o7 t A e$ R$ P6 f$ P' yhaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
) D: y$ G, f: q5 k3 F5 @then in steady conditions at Vmin.
6 w5 _. L" l, y) W' FThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall% K/ N0 e& r! o) {! Z F1 H3 v7 k
be retained and shall reach at least the declared EBLF.
1 l2 f6 d( W) w) A0 `0 w1 [The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.; X2 M4 {. ~8 w0 y' d* A
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.7 R, q7 w8 L$ |
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
3 y1 S2 M, T5 l7 I0 dAny test circuit corresponding to that of Figure 1 can be used to make the measurement of EBLF. The luminous flux of a lamp is usually measured with an integrating photometer. For ratio measurements of luminous fluxes, a suitable illuminance meter is sufficient as there is a close relationship between luminous flux and illumination at a fixed point.
5 Q! S! g* ?$ ~, N9 ?( g& rNOTE Other methods may apply for determining EBLF in particular methods which record permanently the luminous flux of the lamp associated to the ballast under test.$ d6 b* o/ U9 S2 ^5 \' \
" Y8 `; D1 J3 d
F译得不错。
. g# ^8 \' m$ b" [$ P但是否注意到红字表示的地方，是否有对应关系？前面红字及相关部分如何译好？ |
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发表于 2007-8-29 15:24
发表于 2007-8-29 16:20