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2 ^! ^' C0 p+ }' ~20 Functional safety (EBLF)
# @4 q" Y5 _1 g/ l4 R zThe appropriate lamp associated to the ballast shall provide the necessary light output after \# f: y5 _* a( y$ L# L( N) F
change over to the emergency mode. This is verified if the declared Emergency ballast lumen R0 i# |/ E9 b- D! f
factor (EBLF) is achieved during emergency operation at 25 °C.
& A" p H8 C# i8 J* q- ECompliance is checked by the following test:$ s3 C, g/ Z2 N# @6 h _! X
a) ballast provided with batteries:
- l! S: ~# b4 i9 J5 ~The voltage supplied to the ballast by the batteries is continuously measured during" P% R* {/ h0 T' R1 j1 [( z
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The7 ` Z( b' t. s! o! e; ~
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after% q. u; B* j+ R, ~. Z
failure of the normal supply and the end of rated duration of operation are retained for the
7 t) o5 I S7 KEBLF measurement.. O, k6 |# _5 t. r( A
b) ballast not provided with batteries and designed for d.c. central supply system:& ]3 F: I6 u: _4 r* @5 h4 v; ?
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are, b5 p7 A/ Q0 j- M; q
retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
! j i; P% I( S/ Y! F, x6 h$ N0 b2 d) Qrated voltage (V1) unless specifically advised of a different value by the control gear
5 R. x. [5 ~- D" Q( j4 Y: E, } H9 smanufacturer.3 S' y1 f! g! p0 P
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause. |" K6 F' }8 V7 {
22.16.1
4 w0 O4 Y g$ U0 _9 V9 P5 ^Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
7 H3 h) \: P+ h& Thaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,. c! f" Y( Y4 [3 F
then in steady conditions at Vmin.$ M F* o; g: ?: D1 y7 g
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall, [" N; A" y6 k' z
be retained and shall reach at least the declared EBLF.; f) @* O$ B6 }. p. E; ^7 c
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
6 P3 O* j+ F/ |8 C5 i3 N9 tNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
. `! Y1 r( f; H4 LAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
}0 O! N) s) ?6 ^! K. ~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. P6 a! D9 f2 a( t g- v
NOTE 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./ ^" S* S: g6 A/ E$ M
3 \* T Z2 X5 T* c; i8 fF译得不错。
# \( G; u& W/ c& N& X+ l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