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4 n5 I( P# c# c& l2 A! m7 m# W. G( g20 Functional safety (EBLF)
0 K) ?* F/ A3 w; ~0 O+ n' oThe appropriate lamp associated to the ballast shall provide the necessary light output after
, Y; ~! M/ B- d$ P. {+ Lchange over to the emergency mode. This is verified if the declared Emergency ballast lumen
5 l8 N& i. m" n$ Tfactor (EBLF) is achieved during emergency operation at 25 °C.% M" V" J1 h) m& z4 I. a, }2 [- C
Compliance is checked by the following test:+ c8 ?; s% Y' ?9 L+ q$ E K
a) ballast provided with batteries:! H; G+ A. s/ z
The voltage supplied to the ballast by the batteries is continuously measured during5 }- b4 `" {# v3 R2 F
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
. b( W6 F" y! G- m0 h& ]values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
4 ]( h! A6 [( `$ U! z& Ifailure of the normal supply and the end of rated duration of operation are retained for the
- |$ V: d% }" N. k0 ?3 ]. [% ]EBLF measurement., F' P4 X. u5 t- I. k' M' f: u8 ~
b) ballast not provided with batteries and designed for d.c. central supply system:! e9 n; T0 L6 l9 u: v) u
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
# O1 [4 \1 ?7 bretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
( I- P# ?/ m3 w1 s+ zrated voltage (V1) unless specifically advised of a different value by the control gear
- f# r% {& V" h0 v- Mmanufacturer.- @" X, J- Z) ~3 }% d" _6 f
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause( G+ z! q) B: N9 N. P" }& |+ R6 h
22.16.14 x5 [. i" X( E* [4 _; x8 }6 P
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and3 ?6 y' b! c7 O
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,$ a1 v' D; O- m/ ^ D6 ^0 j
then in steady conditions at Vmin.7 q) \3 {: K# r
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall, M/ S: w; q* s8 U' a
be retained and shall reach at least the declared EBLF.
5 ^+ U [" r7 N+ d/ ^The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.& m2 O& o" U4 U4 p% u5 x/ ~
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
, a1 S- `# A) z7 }7 b/ X! |As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.2 i1 U' L! P5 X* @) o. _- q- B
Any 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.
) ]8 c; |/ B7 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.
8 C _0 m9 m; p! q6 K& y% B' d0 e( T. m# u) L" s# P8 o' k
F译得不错。
, a0 D4 _/ @; v# i( v* v( N4 y' d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
