Osram HQI-E 150 W/NDL CL Informations techniques télécharger pdf (Page 13)

1

3

U

S

ECG

Luminaire

Lamp

Fi

g

. 13:

S

implified circuit dia

g

ram showin

g

the elec

-

tronic operation o

f

hi

g

h intensit

y

dischar

g

e lamp

s

Voltage in V

Current in A

Time in ms

Fi

g

. 14:

C

urrent and volta

g

e of a metal halide lamp

operate

d

on a rectangu

l

ar e

l

ectron

i

c

b

a

ll

ast

For a conventional ballast, it can be

p

resumed that the

service li

f

e is de

f

ined b

y

the choke temperature

t

w

.A

10 °

C

increase in the

t

w

temperature means t

h

at t

h

e

se

rvi

ce

li

fe

i

s

h

a

lv

ed.

In electronic ballasts

,

these circumstances are

f

a

r

mo

r

e

complicated. The mortalit

y

rate o

f

individual com

-

ponen

t

s,

t

h

e c

i

rcu

i

t

d

es

ig

n an

d

a

b

ove a

ll

t

h

e e

l

ectron

i

c

l

oa

d

an

d

t

h

e temperatures at w

hi

c

h

t

h

e un

i

ts are oper

-

a

t

ed

h

a

v

e

a

co

n

s

i

de

r

ab

l

e

in

f

l

ue

n

ce

o

n th

e

se

rvi

ce

li

fe

beha

v

io

r

.

This is wh

y

the nominal service li

f

e o

f

electronic

ballasts is stated in combination with a

f

ailure prob

-

abilit

y

. For example, all units in the product

f

amil

y

P

O

WERTR

O

NI

C

®

PTi h

a

v

e

a

n

o

min

a

l

se

rvi

ce

li

fe

of

40,000 hours with

f

ailure probabilit

y

o

f

maximum

10

%

when o

p

erated at the maximum

p

ermissible

t

em

p

era

t

ures

.

Th

e

se

rvi

ce

li

fe

of

e

l

ec

tr

o

ni

c

ba

ll

as

t

s

i

s

in

f

l

ue

n

ced

directl

y

b

y

the temperature at which the units are op

-

erated. This is wh

y

2 temperature values are de

f

ined

t

o

desc

r

ibe

t

he

t

he

rm

al

beha

v

io

r.

The

a

m

bie

nt t

e

m

-

pera

t

ure

t

a

d

escr

ib

es t

h

e temperature

i

mme

di

ate

ly

surroun

di

n

g

t

h

e un

i

t an

d

t

h

us preva

ili

n

g

aroun

d

t

h

e

e

l

ectron

i

c com

p

onents.

T

o

b

e c

l

ear, t

hi

s

i

s not t

h

e

room tem

p

erature or the ambient tem

p

erature of the

lu

m

i

n

ai

r

e.

When an electronic ballast is

f

itted in a luminaire

,

the

rea

l

am

bi

ent tem

p

erature

t

a

o

f

the ballast can onl

y

be

measured with

g

reat difficulty and at

g

reat effort. This

i

s w

hy

a secon

d

temperature

h

as

b

een st

i

pu

l

ate

d

: t

h

e

t

c

temperature.

B

as

i

ca

ll

y t

hi

s

i

s t

h

e cas

i

n

g

tempera

-

ture w

hi

c

h

can

b

e measure

d

by

a t

h

ermocoup

l

e at a

set po

i

nt – t

h

e t

c

point – and is de

f

ined as maximum

permissible temperature at which sa

f

e operation o

f

the

el

ectron

i

c

b

a

ll

ast

i

s st

ill

g

uarantee

d

.

I

n a

ddi

t

i

on, t

h

e

t

c

tem

p

erature is set in relation to the ballast service li

f

e.

T

hat means that the measured

t

c

tem

p

erature

p

ermits

ver

y

prec

i

se conc

l

us

i

ons as to t

h

e ant

i

c

i

pate

d

serv

i

ce

li

fe

of

th

e

e

l

ec

tr

o

ni

c

ba

ll

as

t

.

OS

RAM’s HID electronic ballast for example principall

y

r

eac

h

es

it

s

fu

ll n

o

min

a

l

se

rvi

ce

li

fe

a

t th

e

m

a

xim

u

m

p

erm

i

tte

d

t

c

tem

p

erature.

I

n

p

ract

i

ce, t

hi

s means

t

h

at an

y

temperature

l

eve

l

s

b

e

l

ow t

h

e

t

c

t

empera

t

ure

always prolon

g

the e

ff

ective service li

f

e. As a rule o

f

thumb, it can be presumed that a temperature 10 °

C

b

e

l

ow t

h

e

p

r

i

nte

d

max

i

mum t

c

tem

p

erature w

ill

d

ou

bl

e

th

e

se

rvi

ce

li

fe

of

th

e

e

l

ec

tr

o

ni

c

ba

ll

as

t

.

H

owever,

i

t

i

s not a

d

v

i

sa

bl

e to use on

ly

t

h

e a

b

so

l

ute

m

a

x

i

m

u

m t

ole

r

able

t

c

value

f

or conclusions re

g

ardin

g

the qualit

y

and service li

f

e o

f

an electronic ballast. This

is because on the one hand, the

p

osition and there

f

ore

indirectl

y

also the value o

f

the

t

c

point can be

f

reel

y

defined b

y

ever

y

electronic ballast manufacturer.

O

n

the other hand, the rule o

f

statin

g

the nominal service

li

f

e at the maximum

p

ermitted

t

c

tem

p

erature

h

as not

yet

b

ecome esta

bli

s

h

e

d

t

h

rou

gh

out t

h

e e

l

ectron

i

c

ballast industr

y

. In practice this means that man

y

electronic ballasts onl

y

achieve approx. 50

%

o

f

their

n

o

min

a

l

se

rvi

ce

li

fe

a

t m

a

xim

u

m t

c

t

empera

t

ure

.

3

.

2

.

3

Ad

vanta

g

es o

f

operat

i

on w

i

t

h

e

l

ectron

i

c

ballast P

O

WERTR

O

NI

C

®

PTi

T

he

f

ollowin

g

table provides an overview o

f

the advan-

ta

g

es o

f

operatin

g

lamps with the electronic ballast

.

Th

e correspon

di

n

g

va

l

ues an

d

statements are

b

ase

d

on tests and ex

p

erience with P

O

WERTR

O

NI

C

®

PTi

ballasts, so that the

y

cannot necessaril

y

be trans

f

erred

1:1 t

o

ba

ll

as

t

s

of

o

th

e

r m

a

k

es.

I

n compar

i

n

g

t

h

e convent

i

ona

l

an

d

t

h

e e

l

ectron

i

c

ballast, the

p

er

f

ormance o

f

the conventional ballast

constitutes the reference parameter and is

g

iven a

v

a

l

ue

of

1

00

. Thi

s

i

s

a

l

so

based

o

n th

e

fac

t th

a

t th

e

lam

p

p

arameters are de

f

ined with the re

f

erence

co

nv

e

nt

io

n

al

ballas

t

.

For more details,

p

lease refer to the P

O

WERTR

O

NI

C

®

T

echnical

G

uide – Electronic control

g

ears for metal

h

a

lid

e

l

amps

.

Nominal service life

(

B10

)

: max. 10% of the

e

l

ectron

i

c

b

a

ll

asts

h

ave

f

a

il

e

d

A

se

r

ious

e

v

alua

t

io

n

of

t

he

elec

tr

o

n

ic

ballas

t

serv

i

ce

lif

e

i

s on

ly

poss

ibl

e

by

compar

i

n

g

t

h

e

e

l

ectron

i

c

b

a

ll

ast am

bi

ent tem

p

erature t

a

w

ith

t

h

e correspon

di

n

g

serv

i

ce

lif

e.

C

omparison of the service life usin

g

onl

y

the t

c

tem

p

erature

i

s not a

pp

ro

p

r

i

ate

.

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