|
我将有关文字复制在此:
: E% T$ b3 F5 _3 Y" ~ R* h20 Functional safety (EBLF)6 n0 Q% ]& r5 ~6 Y% P1 y: y ^7 _' O
The appropriate lamp associated to the ballast shall provide the necessary light output after8 d+ t$ d7 N8 s" c1 b ~% f- E- A
change over to the emergency mode. This is verified if the declared Emergency ballast lumen1 e+ ]1 [( H1 ~" O$ Q& }
factor (EBLF) is achieved during emergency operation at 25 °C.
# R, @3 _3 V& c$ d8 {Compliance is checked by the following test:* J9 L& R2 P2 ~4 Q& z
a) ballast provided with batteries:
4 B9 H4 y2 N# h3 _The voltage supplied to the ballast by the batteries is continuously measured during7 s- ~, o" A4 J5 a6 u! N$ N
emergency operation after a 24 h charge at 0,9 times the minimum a.c. operating voltage. The% q) W" e; S0 J% U" {8 f9 Y `
values measured at 60 s (V1) and the lowest voltage (Vmin) measured between 60 s after% t0 ~# m& G/ y
failure of the normal supply and the end of rated duration of operation are retained for the
; G4 r, [" {7 q9 a f7 kEBLF measurement.
) q0 `# `# P W* L0 V1 A- O! hb) ballast not provided with batteries and designed for d.c. central supply system:5 L2 V2 g0 c. \4 w8 D) u- n
The rated (V1) and the minimum (Vmin) voltages as declared by the ballast manufacturer are
* G/ U8 I# _0 a N, k7 Q! [retained for the EBLF measurement. In this case the Vmin value is taken to be 0,85 times the
8 W# H+ S) T9 I+ h6 R5 Xrated voltage (V1) unless specifically advised of a different value by the control gear
3 S+ H, {8 g% I* k# L% Ymanufacturer.
% P) Z4 J" k; _' {5 Q/ }2 I# h; MNOTE The value of 0,85 times rated voltage is selected to provide consistency with IEC 60598-2-22:1997, Clause
0 C# o# h9 q8 Z' h22.16.1! }4 u* {. }' H S
Measurement of EBLF shall be made at 25 °C, using a lamp of the appropriate type and& j) D& }, r1 |4 K
having not been lit for 24 , first at V1 after 5 s and 60 s of the application of the d.c. voltage,
. [3 T0 F, [) |2 f6 ?5 mthen in steady conditions at Vmin.
: o1 S( X, I9 nThe lowest value of the values measured at 60 s and V1 or in steady conditions at Vmin shall
5 ^# K& k) ]1 n3 z1 I+ J8 Q+ _be retained and shall reach at least the declared EBLF.1 j8 ~. s3 n2 ^. h* o: p
The value measured at 5 s and V1 shall reach at least 50 % of declared EBLF. D; G3 }0 }0 b0 l6 I0 E
NOTE Replace 60 s by 0,5 s for ballasts declared for use in luminaires for high-risk task area lighting. s5 Q* _5 S2 e$ t: _. G C
As declared EBLF must be reached after 0,5 s, measurements at 5 s are not considered." d, U- d3 a: g( _
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.( ~) m0 u) C0 L9 p$ g
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.
3 I: H: Q/ Y( |- X$ {# ]3 y( f( [% @9 t
F译得不错。: N3 a9 t$ s" {, v4 X5 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? |
|