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: ^3 R) g4 w. B3 ?5 ~/ E20 Functional safety (EBLF)
8 R1 @' L+ N/ IThe appropriate lamp associated to the ballast shall provide the necessary light output after# [! E% o1 _* `$ `+ X! j% S) x' Z
change over to the emergency mode. This is verified if the declared Emergency ballast lumen
" B& |4 H# [, W. }( M, |( _) rfactor (EBLF) is achieved during emergency operation at 25 °C.% v1 v( F% v/ I! o n7 d
Compliance is checked by the following test:
9 Y' t& t" _, G1 I* ]1 X0 h( ^a) ballast provided with batteries:. ]4 }1 ?8 [# W) P% s
The voltage supplied to the ballast by the batteries is continuously measured during
! N/ G" V( ~! {2 R. h3 pemergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The$ A1 m; R: t! Z- `9 |8 L
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after
' S3 ]& }; P5 ~. wfailure of the normal supply and the end of rated duration of operation are retained for the' V7 W6 p& d, F' I: Q
EBLF measurement.; |1 W* l4 h0 N2 B% x
b) ballast not provided with batteries and designed for d.c. central supply system:2 U+ v7 K4 t- l0 h
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are2 `) t2 j. m P4 o
retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
. H/ ~0 R! y" G, g7 grated voltage (V1) unless specifically advised of a different value by the control gear9 G% U/ L* B6 [8 _+ I3 q
manufacturer.0 p6 r1 R! ^: l/ [) u6 u$ |
NOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause/ V9 N5 Z7 @$ {0 i( g6 [) N
22.16.1$ T& g6 s' U4 R1 |$ r+ v
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and+ h; p6 C, i% [
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,9 y r* a1 B/ u: C
then in steady conditions at Vmin.
# t: [, d8 f' v1 O* _/ ?The lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall2 U; |' B9 `& ?, d5 p
be retained and shall reach at least the declared EBLF.0 Y& q7 w& W6 Y7 W" Y4 [ H
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF.9 E6 A0 K6 o; q8 h- E5 b) }
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting.
/ y3 I: s8 @# m Z+ _1 c7 X' J# yAs declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered.& r8 K& c( `, z( U3 j7 c. c a
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.( Y+ o& a& c7 p3 r7 E
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., p/ y* x7 Y; h: r! I
- E% w( T% Q$ K# a6 X2 ^6 V5 WF译得不错。6 k3 ?& B; B% ]- P6 m' W
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