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6 X* G. F% v' p& D( s+ X20 Functional safety (EBLF)
; s; k6 i8 `# q8 W0 ^6 _The appropriate lamp associated to the ballast shall provide the necessary light output after
$ v/ b! C, D- i% h/ `change over to the emergency mode. This is verified if the declared Emergency ballast lumen9 F) m& z9 P* p/ W% Q1 s2 j- q$ Q
factor (EBLF) is achieved during emergency operation at 25 °C.8 s3 M/ i) b2 V4 _ @
Compliance is checked by the following test:
, D6 e! d2 H/ x1 Ba) ballast provided with batteries:
: B( m' i6 C( cThe voltage supplied to the ballast by the batteries is continuously measured during8 ^3 Q3 H9 w4 A4 W9 j5 a0 Q
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The
) [8 ?) |8 {$ J- z' ~values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
( v0 D% m$ T& Q/ v+ _3 ofailure of the normal supply and the end of rated duration of operation are retained for the; d' u* Z/ N. ^$ o# P
EBLF measurement.6 Z: z& y; P- I
b) ballast not provided with batteries and designed for d.c. central supply system:
- j% P4 M O8 a+ ?0 cThe rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
. x3 @9 M b- d' Y" \+ g6 Fretained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
' ]0 a$ \5 K. Z# Zrated voltage (V1) unless specifically advised of a different value by the control gear1 P1 C4 R9 p3 t: H( Y0 c
manufacturer.9 N8 `/ @. w0 M% }
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
9 M7 w+ d8 M5 _9 J' `22.16.1# @+ v* @, \! p( V% |
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and
3 X1 X) b. l4 j! D3 Ehaving not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
' X! P. Z1 K9 E0 e4 K& Hthen in steady conditions at Vmin.. L7 ^( A7 t4 a1 v! P% H# o
The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall1 t# M/ x3 p: E, t+ x- `
be retained and shall reach at least the declared EBLF.
0 M" U% T3 d* j6 MThe value measured at 5 s and V1 shall reach at least 50 % of declared EBLF." y* c$ a4 u9 l/ Z! f1 _/ A( }
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
) N6 z7 s- N$ h- t+ J; PAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.7 T& c" o( V; c X1 ~
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.
2 b' g* @ {2 H8 W8 S1 r6 U, qNOTE 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.
4 q9 I5 T% n% N- m. C. s8 p( S; ?3 A5 Z$ v6 J+ ~ R3 @5 f
F译得不错。% n- U& v! T, H
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
