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( B) q4 e! C+ o9 Q# p- R* w20 Functional safety (EBLF)
9 R) v8 C/ s; }The appropriate lamp associated to the ballast shall provide the necessary light output after
' S) x. S/ R4 \1 I& S# zchange over to the emergency mode. This is verified if the declared Emergency ballast lumen+ U9 _* J4 ^6 P- N: u; E
factor (EBLF) is achieved during emergency operation at 25 °C./ J0 C: C- t( L' H. c
Compliance is checked by the following test:
/ _8 ]2 Q1 k" v% qa) ballast provided with batteries:7 |; n% K9 c5 o+ g3 u' j3 U
The voltage supplied to the ballast by the batteries is continuously measured during: g; W3 K8 D( s
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The `, X/ L* e# k2 Y/ b3 q0 n
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
: M3 M3 U" l8 S+ t' y! i& Z/ Vfailure of the normal supply and the end of rated duration of operation are retained for the
6 b! B \2 h, D* YEBLF measurement.9 Z! a- l8 o% s# r: w
b) ballast not provided with batteries and designed for d.c. central supply system:$ o. }& X! l# R
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
/ j3 m6 M' A; u K& xretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
: O e) K6 d9 s+ wrated voltage (V1) unless specifically advised of a different value by the control gear: e3 @% w) z' M+ l' b. R l5 b9 F
manufacturer.& G( `" J6 H) l3 H$ h$ D0 O, v
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause4 r' O) X; j! V
22.16.1
' t7 ^- K, D% r3 wMeasurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and3 i& V+ ~3 `' h& o! w: ?
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
% y4 I4 q) Q- }( Ythen in steady conditions at Vmin.! E$ q$ X l# D+ f! O
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
- J) p; |; q pbe retained and shall reach at least the declared EBLF.: @2 F( y) d+ B5 R9 W' |8 q; J
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.
4 k1 F' c" o, _( ]" RNOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
. b1 ]3 U5 k, b; N- b3 xAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.
8 }/ f( j j# A' u: n. K. i- Z. kAny 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.
, ^! \. t+ Z4 W7 i% d% P$ eNOTE 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.
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$ A- [8 w6 O+ D- p, n; fF译得不错。
1 b# {! b F/ M' I: I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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