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The LED module shall be switched on and the power monitored (at the input side) and6 ^+ z! M u0 x. d# R9 T
increased until 150 % of the rated voltage, current or power is reached. The voltage or the* t, u1 V1 P4 c
current shall be increased until 150 % of the rated power is reached. The test shall be" a. R8 W+ h$ a0 _% O
continued until the LED module is thermally stabilised. A stable condition is reached, if the/ y$ l# m9 w& A* _; N. v4 ^
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
( A' c$ X) |' ^4 J8 u4 q1 Ithe tc point. The LED module shall withstand the overpower condition for at least 15 min, the
1 s, ~3 Y8 A; l, v/ }% ?9 l7 X4 Ytime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
, _3 q4 M7 X2 f; D f8 t) v# `( \ ~5 a" f0 E
If the module contains an automatic protective device or circuit which limits the power, it is7 F. h W0 w5 ]# c G
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
- U9 ?3 Q1 L& \. a2 W7 `0 p2 s) W2 Mover this period, the module has passed the test, provided the compliance (4.1 and last
! j( {! G' C1 H$ Tparagraph of 13.2) is fulfilled.
5 g, E) N( H( m; oAfter finalising the overpower mode, the module is operated under normal conditions until/ g( v5 p. S. f1 M; {. J2 T2 g [
thermally being stable.( s: C% M1 {+ x! n+ V
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
' I( F" t2 V! m# Qoverpower condition has been withstood. To check whether molten material might present a) v# G: Y1 ?9 n$ f. `: x! F
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
! ~1 f8 i, n$ l' W# i/ ^shall not ignite. |
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发表于 2013-6-26 09:21
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