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# I& Y* w5 H, c: w20 Functional safety (EBLF)
9 m& I+ H( N( }5 V' ^% }, Q" yThe appropriate lamp associated to the ballast shall provide the necessary light output after( {9 D+ s) l5 v. R& R7 n
change over to the emergency mode. This is verified if the declared Emergency ballast lumen
0 m6 e9 {: y |8 rfactor (EBLF) is achieved during emergency operation at 25 °C.
$ C$ g2 W z& A4 G. E" `2 h$ MCompliance is checked by the following test:# }( L* o, d- l; p' k. M' p
a) ballast provided with batteries:
! L2 a7 o. ]+ D7 HThe voltage supplied to the ballast by the batteries is continuously measured during- t/ G) A. g8 h6 j2 h6 p+ }
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The# \1 c$ V# O, X# b4 O: ]2 A
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
) J9 K( v R3 p2 [) ]* x2 a$ \+ J% Jfailure of the normal supply and the end of rated duration of operation are retained for the
d; `: G! U- ]+ c* @6 q3 PEBLF measurement.
2 A! S9 V* B* n4 s1 B# z% o) V2 Rb) ballast not provided with batteries and designed for d.c. central supply system:! n5 a. V0 ~" }+ A! Y
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are2 h( U( M+ r9 ~9 m
retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
$ A9 E. Q \7 x( E+ x3 }; nrated voltage (V1) unless specifically advised of a different value by the control gear
$ N: h$ P! R) M8 b: umanufacturer.
! D! _' X& E3 |NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause) G3 P5 j2 W7 ^( B' @1 s0 d
22.16.1% P- d6 l/ L y0 S2 I, W7 }
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and: r+ ^, H# y w+ S: e p4 Y
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,* I- B8 S$ M- j9 T
then in steady conditions at Vmin.
" {- m- k; F* d9 h3 rThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
/ z7 P6 v G$ u9 i H% \be retained and shall reach at least the declared EBLF.
3 @* P' t* U: e9 OThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
5 m. ]7 E' V) f+ j1 ]NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.4 D5 a, y0 M$ W- I* {
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.9 e0 i3 W. V. B* |$ y
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.1 r" A% l; o3 @9 b
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.( A1 d% H4 w* i3 ~
) Y: N+ f' b) {F译得不错。, ?0 |( G, l0 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
