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rack. If the he at sink te mp eratu re rise s to o h ig h , se nsing circuits will mu te th e ho t cha nn e l. If the p o we r sup ply
o ve rh ea ts, a n othe r sen sin g circu it w ill m ute b oth o utpu t cha n ne ls, u ntil th ey co ols d ow n to a sa fe op era ting
tem pe ra ture.
F or installa tio ns w ith a ce ntra l coo lin g syste m, usua lly fou n d in fixe d insta lla tion s w ith a d ed ica te d rack roo m, it m ay be
n ecessa ry to ca lcula te th e ma xim um h e at e mission . R efer to P o we r co n su mp tio n on pa ge 1 0. R em em b er n e ve r ra ck
d iffe re n t bra nd s of am plifiers tog eth er tha t h ave o pp osing a ir flow ch ara cteristics.
6 .3 O p e r a t i n g v o l t a g e
W AR NING !
A lab el ju st be lo w the m a in s ca b le in le t on th e rea r of th e a mp lifie r in d ic ates th e s elec te d A C m ains o p erating
v olta ge . C on n ec t th e m ain s ca ble o nly to th e A C s ou rc e referred to o n th e lab el. T he wa rran ty will no t c ov er
d am ag e c au se d b y co n ne cting to the w ron g ty p e of AC m ain s.
If th e fitte d m ains co nn e ctor is n ot ap prop ria te fo r yo u r co u ntry, it ca n b e cu t o ff an d wired to a suitab le co nn ector in
the follow in g w ay:
B LA CK o r B RO W N L IV E
W HITE o r B LU E N EU TR AL
G RE EN o r G RE E N/YE LL O W E AR TH
O nce co n ne cte d to a su ita ble AC su pp ly, the am plifier ca n be starte d w ith the p o we r switch. Wh en yo u po w er u p the
a mp lifie r it ta ke s a cou p le o f secon d s to se lf ch eck (this is kn ow n a s the "so ft sta rt" or "slo w sta rt" seq u en ce ), th e fan s
the n blo w at high sp ee d b efore g oing in to "idle". T he tw o bo tto m gre en L E D’s th e n illum in ate to sho w th e a mp lifie r is
o pe ra tio na l.
6 .4 D e n m a r k :
N atio na l d eviatio n con ce rning in stallatio n o f th e M A2 .8 s:
D an ish safety reg ula tion on ly p e rm its the u se of an 8 A m ain fuse. A s the MA 2 .8 s u se s a n in terna l p rima ry ma ins fuse
o f 15 A, th e M A2 .8 s m ust b e eq uip pe d w ith an in du stria l m ains co nn ector ra te d fo r 1 6A or a bo ve, o r a s an alte rna tive it
can b e h ard w ired to a 1 6 A ca pa city circu it an d b re aker.
6 .5 Sw i t z e r l a n d :
N atio na l d eviatio n con ce rning in stallatio n o f th e M A 2.8 s
:
S wiss sa fe ty re gu la tio n stipu la tes th at typ e 2 3 m ains co nn ectors mu st be used .
6 .6 G r o u n d i n g
T he re is n o g ro un d lift switch o r te rmina l o n th is am plifier. T he sign al grou nd is a lwa ys floa tin g via a resistor to cha ssis
a nd the grou n ding system is a uto ma tic. If a po te n tial d iffere nce ab o ve 0 .6V is d etected b etw ee n sig na l g ro un d a nd
cha ssis grou n d, a sh ort circu it is a u to ma tically in trod u ce d b etwe en th e two , en surin g e le ctrical protectio n. If o th e r
e qu ip me n t or am plifiers w ithin a system sho u ld d e ve lo p a n ele ctrica l fau lt to e a rth, th e ma ins fu se o n tha t e qu ip me n t
sho uld rup tu re du e to th is au to m atic system , a llo wing a n e arth cu rre nt to flo w for p rotectio n pu rpo se s
If ho we ver yo u wish to p e rm an en tly co nn ect the sign al g rou nd to cha ssis e arth , con ne ct th e X LR -co nn ecto r’s sh ell lu g
to pin 1 . In th e in terest o f sa fety n ever d iscon n ect th e e arth pin o n th e m ains ca ble
.
T o co mp ly with CE a p prova l (rad io in terfe re n ce ), th ere is an AC m ain s filte r. T h is filter n e ed s the cha ssis g ro un d for
referen ce, o the rw ise a cu rren t loo p is fo rm e d via the sign al grou nd .
N ev er d isc on n ec t (lift) the m ain s sa fety ea rth .
6 .7 Po w e r c o n s u m p t i o n
T he re a re th ree w ays to d etermin e th e p ow er/cu rre nt con sum ption o f the a m plifie r:
F irst, the p ea k cu rre nt draw a t full o utpu t p ow e r. U nd e r th is co nd ition th e po w er a m plifie r w ill o pe ra te fo r less tha n 2
m in utes be fo re th erm ally limitin g or blow in g the ma in s fuse, an d is an u n re alistic ‘n orma l’ use con ditio n. T o d esig n a
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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