Ampetronic MLD7 System manual

MLD5
Installation Handbook
www.ampetronic.com

Handbook Contents
• Safety
• Introduction
• Quickstart
• Installation
• Overview
• Troubleshooting
• Accessories
• Technicalspecications
• Warranty
• Declarationofconformity
Box Contents
• 1xMLD5
• 2xLoopconnector
• 1xStatusconnector
• 1xDCconnector
• 1xInstallationhandbook
• 2x2mmsteel1Urackmountbrackets
• 1xPowercable(regionsspecic)
• 1xInductionLoopSign
 
 
This symbol is used to alert the user to important
operating or maintenance instructions.
The Lightning bolt triangle is used to alert the user
to the risk of electric shock.
SAFETY
1. Itisimportanttoreadtheseinstructions,andtofollowthem.
2. Keepthisinstructionmanualinanaccessibleplace.
3. Cleanonlywithadrycloth.Cleaninguidsmayeffecttheequipment.
4.
 
 
Donotblockanyventilationopenings.Installinaccordancewiththemanufacturer’s
instructions.
5. Donotinstallthisequipmentnearanyheatsourcessuchasradiators,heatingventsorother
apparatusthatproducesheat.
6.
 
 
WARNING–THISAPPARATUSMUSTBEEARTHED/GROUNDED.
7. Onlypowercordswiththecorrectpowerconnectormaybeusedtomaintainsafety.Cables
incorporatingtheUK13Afusedplug,SchukowithearthingcontactsandULapproved
“groundingtype”areacceptable.Thesemustbepluggedintopoweroutletswhichprovidea
protectiveearth.
8. Referallservicingtoqualiedpersonnel.Servicingisrequiredwhentheapparatushasbeen
damagedinanyway,suchasapowersupplycordorplugisdamaged,liquidhasbeenspilled
orobjectshavefallenintotheapparatus,theapparatushasbeenexposedtoanyrainor
moisture,doesnotoperatenormallyorhasbeendropped.
9.
 
 
WARNING–Toreducetheriskofreorelectricshock,donotexposethisapparatusto
rainormoisture.Theapparatusshallnotbeexposedtodrippingorsplashingandno
objectslledwithliquids,suchasvases,shallbeplacedontheapparatus.
 
 
 
 
 
 
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE THE
COVER. THERE ARE NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
Ampetronic MLD5 Installation Handbook Page 1

Ampetronic MLD5 Installation HandbookPage 2
Introduction
TheMLD5Inductionloopdriverhasbeendesignedasahighqualitydualchannelamplierforuse
withmultiplelooporPhasedArrayloopdesigns.
AnArraySystemprovidesasolutionwhereasimplelooparoundtheroomperimeterwillnotwork.
Arraysarethestandardsolutionforbuildingswithmetalstructureorreinforcements,orforcovering
largeareas.Arrayscanalsodramaticallydecreasethe‘spill’ofthemagneticsignaloutsideofthe
room,allowinginductionloopstobeinstalledinadjacentrooms,andprovidinganimprovedlevel
ofcondentiality.Arrayscanalsobeusedtochangethewaytwoloopsinterferewitheachother,
providingwaysofsolvingeventhemostcomplexinstallationproblems.
Dependingonanumberoffactorsregardingtheinstallationoftheloopandtheset-upofthe
ampliertheMLD5canprovidecompliancewithIEC60118-4forperimeterloopareasofupto2x
420m2orphasedarraysystemsupto360m2.
Easeofinstallationandusehavebeenmajorfactorsinthedesign,combinedwithoptimised
performance,andthefreedomfromR.F.I.generation.
TheMLD5stwooutputchannelscanbeconguredwithorwithout90°ofphaseshiftbetween
thetwo,allowingtheuseofarraysystemsortwoseparateloopswiththesamesignaltherefore
doublingtheareacoverage.
TheMLD5hastwobalancedinputs.Thesecanbeconguredformicrophoneorlineinputswith
individuallyselectablephantomandgainboost.
Formorecomplexinstallations,youmayneedancillaryequipmentsuchasmicrophonepre-
amplier(s),adaptor(s)forusewith100Vline,orsignalprocessingunits.SeeAccessoriesor
contactAmpetronicforadvice.
QUICK START
Forthosewhohaveagoodappreciationofloopsystems,thefollowingisaveryquickguideto
settinguptheamplier:Allyouneedisanacpowersource,asignalsourceandaPhasedArray
looppair.See‘DesigningInductionLoops’handbook(supplied)orcontactAmpetronicforadvice.
Installation
a.Turnallcontrolsfullyanti-clockwise.
b.Connectloopcables.
c.Connectsignalinput(s).
d.Connectpower.Seepoints6and7inSAFETYsection.
e.Ifrackmountedremoveallrubberfeetfromunits.DONOTre-tthefeetxingscrewsasthis
maycausedamageandinvalidatethewarranty
Operation
1. SwitchON–check‘earsymbol’ashesduringselftestandilluminatescontinuouslywhen
checksarecomplete.
2. ApplyinputsignalandincreasetheinputcontroluntiltwogreenCOMPRESSIONLEDsare
illuminatedonthepeaksofthesignal.
3. Selectphaseshiftrequired0or90°.
4. AdjusttheCURRENTcontrolsuntiltheCURRENTLEDsilluminatetoachievethedesired
peakcurrents.
5. Repeatstep2foranyotherinputsused.
6. Listentothemagneticeldproducedinsidetheloopareausingareceivingdevice(e.g.
AmpetronicILR3),orexaminetheperformanceinmoredetailwithaeldstrengthmeter.
7. AdjustMLCcontroltoachieveaatfrequencyresponse.

Ampetronic MLD5 Installation Handbook Page 3
CONNECTIONS
Inputs

  
  
 
  
 
 
 
 





Outputs

  
  
 
  
 
 
 
 





BLOCK DIAGRAM
1=TwistedPair,2=QuadCore
Refertotechnicalspecicationsforconnectiondetails

  
  
 
  
 
 
 
 





INPUT 1
PHANTOM
POWER
GAIN BOOST
INPUT 1
GAIN
INPUT 2
PHANTOM
POWER
GAIN BOOST
INPUT 2
GAIN
AUTOMATIC
GAIN
CONTROL
(AGC)
METAL
LOSS
CORREC-
TION
(MLC)
MLC
LEVEL
PHASE
SHIFTER
AGC
DISPLAY
RED L.E.D.
YELLOW L.E.D.
YELLOW L.E.D.
YELLOW L.E.D.
GREEN L.E.D.
GREEN L.E.D.
PHASE
SWITCH
0/90°
CHANNEL
CURRENT
LEVEL
CHANNEL
CURRENT
LEVEL
POWER
AMPLIFIER
POWER
AMPLIFIER
CURRENT A
CURRENT B
TEMP
RED L.E.D. MONITOR
OUTPUT
YELLOW L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
YELLOW L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
GREEN L.E.D.
CLIP A RED L.E.D.
LOOP A RED L.E.D.
CLIP B RED L.E.D.
LOOP B RED L.E.D.
OUTPUT

Ampetronic MLD5 Installation HandbookPage 4
INSTALLATION
Location
Theunitmaybefreestandingor19”rackmountableusingtherack‘ears’supplied.Fittingofthe
‘ears’isachievedbyremovingthethreeforwardmostscrewsonbothsides.Thesamescrews
arethenre-usedtosecurethe‘ears’inplace.(APH2screwdriverwillberequired).For19”rack
mountingthefourrubberfeetmustberemoved.
 
 
Thelocationmustprovideadequateventilationfortheunit.
Internalfansprovideforcedventilationusingairventsatthefront(intake)andrear(exhaust)ofthe
unit.Theseventsmustbeunobstructedforsatisfactorycooling.Iftheunitisinstalledinanenclosed
environment,sufcientairowintotheenclosuremustbeprovidedthroughvents,fansorother
means,suchthattheunitsexhaustairisnotrecycledtotheinlet-causingareductioninoutput
currentorOVERHEATLEDtobeilluminated.
ContactAmpetronicforadviceoncoolingrequirementsforyourinstallation.
Tools and Equipment
Smallhandtoolsincludingawirestripperandasmallatbladescrewdriverwillberequired.
AnILR3loopreceiveroramagneticeldstrengthmeterisvitaltocheckthattheloopsystemis
providingthedesiredlevelofperformance.
Apairofstereoheadphoneswitha3.5mmjackplugconnectionisalsousefultomonitortheloop
signal.
System Requirements
Theinductionloopcablesshouldbealreadyinstalledaccordingtothe‘DesigningInductionLoops’
handbook,orasperspecicdesigninstructionsprovidedbyAmpetronic.Asaresult,atarget
currentshouldbeknown,basedonachievingacceptableeldstrengthacrosstheareatobe
covered.
Inordertoachievecorrectoperationitisrecommendedtheloopandfeedresistanceshouldbe
between0.5and3Ω(atDC).ValuesoutsidethismaycausetheLOOPERRORLEDtoilluminate
andtheampliersoutputtobedisabled.Loopandfeedimpedance(at1.6KHz)shouldbelessthan
thevoltagecapabilityofthedriverdividedbythetargetcurrentrequiredtoachieveeldstrength.
ValuesabovethisguremaycausetheCLIPLEDtoilluminate.Seetroubleshootingsectionfor
adviceonhowtocorrectthisandgetyoursystemworking.
The‘DesigningInductionLoops’handbookcontainsmoredetailsonloopandfeedcables.The
correctdesignandpositioningoftheactualloopisvitalforsatisfactorysystemperformance.Ifin
doubtconsultAmpetronicforadvice.
CONNECTION & SET-UP
ItisadvisedthattheloopsystemisinitiallysetupusingalocalaudiosourcesuchasaCDplayer,
whichisnotconnectedintoanyothersystem.Thisavoidsthecomplicationofgroundloopsand
feedbacketc,whilsttheunitissetup.
Thefollowingproceduredescribestheinstallationofastand-aloneMLD5,anddoesnotincorporate
connectionofotherancillaryunitssuchasmicrophonepre-amps,mixingdesks,orsignal
processingunits.
1. Turnallcontrolsfullyanti-clockwise.
2. ConnectthefeedcablesfromtheloopsintotheNL4loop
connectorssuppliedasshown:


  
  
 
  
 
 
 
 






Ampetronic MLD5 Installation Handbook Page 5
Note: To avoid unwanted stray magnetic elds the feed cable should be tightly twisted or star-
quad connected.
3. Connectthesignalinputsappropriately:
Microphones:Suitabledynamicorcondensermicrophonewithbalancedcablefeed.Select
phantompowerasrequired.ConnecttoINPUT1andINPUT2(withselectorswitchesinthe
appropriateposition)usinga3-poleXLRplugwiredasperConnectionsdrawing.
Linelevelsignals:FromotheraudioequipmentsuchasPAsystem,mixingdeskorCDplayer.
ConnecttoINPUT1andINPUT2(withselectorswitchesintheappropriateposition)usinga
3-poleXLRplugwiredasperConnectionsdrawing.Youmayuseeitherorbothinputs.
 
 
Donotruninputandoutputcablesclosetogether
4. ConnectACpowertotheMLD5.Seepoints6and7inSafetysection.
5. SwitchON.The‘ear’symbolwillashforafewsecondswhilstaninternalself-testisperformed
andtheloopresistanceistested.Ifbothtestsaresuccessful,the‘ear’symbolwillilluminate
continuouslyandtheunitwillbeinanoperationalmode.Ifthe‘ear’symbolcontinuestoash,or
oneorbothLOOPLEDsilluminate,consulttheTroubleshootingsection.
6. Selectoneinputandapplyasuitableaudiosignal(ideallyaCDplayerwithmusicorcontinuous
speechappliedtooneinput,withnoconnectiontotheother).Turntheassociatedinputcontrol
clockwiseuntiltwoCOMPRESSIONLEDsareilluminatedonthepeaksofthesignal.
7. TurnCHACURRENTcontrolclockwiseuntilthetargetcurrentisachieved–asindicatedby
theCHACURRENTLEDs.NotethatconsecutiveLEDsilluminateat3dBintervals.TurnCH
BCURRENTcontrolclockwiseuntilthetargetcurrentisachieved–asindicatedbytheCHB
CURRENTLEDs.HeadphonescanbeusedwiththeMONITORsockettolistendirectlytothe
loopcurrent.NOTE:channelAoutputappearsintheleftheadphoneandchannelBintheright.
Ifhighfrequencyoscillationorlowfrequencyhumisexperienced,consulttheTroubleshooting
section.
8. Theloopsystemshouldnowbeprovidingamagneticeldinsidetheareaoftheloop–usethe
ILR3oreldstrengthmetertoexamineitsperformancewithrespectto:
 a) Magneticeldstrength.Thismayvaryacrossthecoverageduetolayout,metallossand
   loopcurrent.
 b) Frequencyresponse.Metallossestendtoincreasewithfrequency,andmayrequirethe
   adjustmentoftheMLCcontrol.
  Asaresultofthisanalysis,adjusttheCURRENTandsettheMLCtoachievethebestsound
  quality.Thisshouldresultinadequatemagneticeldstrengthandalevelfrequency
  responseinordertosatisfyIEC60118-4.Note:DoNOTadjusttheMLCcontrolwhilst
  listeningtotheMONITORsocketasthiswillnotgiveatrueindicationoftheresponseofthe
  actualloop.
  OncetheCURRENTandMLCcontrolshavebeenadjustedtothecorrectleveltheyshould
  NOTneedre-adjusting.
9. Ifnotalreadydoneso,stepscannowbetakentointegratetheMLD5intoaPA/mixer
arrangementfollowingstandardaudiotechniques.Ifanyunusualeffectsareexperiencedreferto
theTroubleshootingsection.
Note: Ideally, each input signal level should be set up to achieve 6dB (one LED) of
COMPRESSION with the quietest level of input likely to be used. This will maximize the dynamic
range of the system and ensure satisfactory performance.
10.Repeattheaboveprocedureforeachinputused.Whenadjustingeachinput,makesurethe
signalsareremovedfromtheotherinputs.Thisensuresthatallsignalsaresettoequivalent
loudnessanddrivethecompressorproperly.

Ampetronic MLD5 Installation HandbookPage 6
OVERVIEW
I/O:PowerSwitch.
INPUT 1 & 2:Screwdriveradjustablecontrolswhichsettheleveloftheinputsignals.
AUTOMTIC GAIN CONTROL (AGC) COMPRESSION:Showstheamountofgain
reductionindecibels(dB)thatisappliedtotheinputsignal(s).
METAL LOSS CORRECTOR (MLC):Screwdriveradjustablecontrolwhichcompensates
forthefrequencydependanteffectsofmetalintheloopedenvironment.
OUTPUT CHANNEL WARNING LEDs:‘CLIP’LEDsigniesoutputvoltageisclipping,
‘LOOP’LEDsigniesacablespecicationerrorordamage.Seetroubleshootingfordetails.
OUTPUT CHANNEL CURRENT ADJUSTMENT:Screwdriveradjustablecontrolwhichsets
thelevelofoutputcurrentdeliveredtotheloop.
OUTPUT CHANNEL CURRENT LEDs:Indicatesthepeakcurrentdeliveredtotheloop.
TEMPERATURE WARNING LED: Indicatesthattheinternalheatsinkistoohot.Loop
currentisnotdeliveredtoeitherchannel.Seetoubleshootingfordetails.
MONITOR: 3.5mmjacksocketforusewithstereoheadphonestolistentothesignalbeing
deliveredtotheloop.
POWER INDICATOR LIGHT:Flashescontinuouslywhenamplierhasfailedselftestand
isinsafemode.Seetroubleshootingfordetails.
FRONT VENT:Fanassistedventilationinletwithlter.DONOTcover.
1
2
Gain boost Phantom
Gain boost Phantom
MIC LINE MIC LINE
INPUT 2
INPUT1
OUTPUT
PHASE
STATUS
0.1A
+12V
LOOP OUTPUT
CHANNEL A CHANNEL B
Induction Loop Driver
AC POWER INPUT
230V
45 - 65Hz
Power: 85W
Fuse: T 630mA L
Designed and Engineered in the UK
Serial No
DC OUTPUT
MLD5
LOOP O/P CONNECTIONS
1-
2-
1+
2+
01
36
30
24
18
12
6
INPUT 1 INPUT 2 MLC
AGC (dB)
7.0
5.5
3.5
2.5
1.8
1.2
CURRENT (A pk)
CLIP
LOOP
CLIP
LOOP
CH BCH A TEMP
MLD5
01 01 01 01
INDUCTION LOOP DRIVER
www.ampetronic.com
3
4
5
6
7
8
1098
765
4
321
9
10
11
12 13 14 15 16 17
Gain boost Phantom
Gain boost Phantom
MIC LINE MIC LINE
INPUT 2 INPUT1
OUTPUT
PHASE
STATUS
0.1A
+12V
LOOP OUTPUT
CHANNEL A CHANNEL B
Induction Loop Driver
AC POWER INPUT
230V
45 - 65Hz
Power: 85W
Fuse: T 630mA L
Designed and Engineered in the UK
Serial No
DC OUTPUT
MLD5
LOOP O/P CONNECTIONS
1-
2-
1+
2+
01
36
30
24
18
12
6
INPUT 1 INPUT 2 MLC
AGC (dB)
7.0
5.5
3.5
2.5
1.8
1.2
CURRENT (A pk)
CLIP
LOOP
CLIP
LOOP
CH BCH A TEMP
MLD5
01 01 01 01
INDUCTION LOOP DRIVER
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Ampetronic MLD5 Installation Handbook Page 7
Gain boost Phantom
Gain boost Phantom
MIC LINE MIC LINE
INPUT 2 INPUT1
OUTPUT
PHASE
STATUS
0.1A
+12V
LOOP OUTPUT
CHANNEL A CHANNEL B
Induction Loop Driver
AC POWER INPUT
230V
45 - 65Hz
Power: 85W
Fuse: T 630mA L
Designed and Engineered in the UK
Serial No
DC OUTPUT
MLD5
LOOP O/P CONNECTIONS
1-
2-
1+
2+
01
36
30
24
18
12
6
INPUT 1 INPUT 2 MLC
AGC (dB)
7.0
5.5
3.5
2.5
1.8
1.2
CURRENT (A pk)
CLIP
LOOP
CLIP
LOOP
CH BCH A TEMP
MLD5
01 01 01 01
INDUCTION LOOP DRIVER
www.ampetronic.com
11
REAR VENT:Fanassistedventilationoutlet.DONOTcover.
LOOP OUTPUT(S):Neutrik‘Speakon’highcurrentconnectionstoloopcable(s).
STATUS:Connectiontorelaycontactsprovidingremotefaultindication.
DC OUTPUT:2-pinconnectionforancillaryunits.
PHASE SHIFT SELECTOR:Selectable90°phaseshiftbetweenoutputs.
XLR INPUTS: SocketforbalancedMICorLINEsignals.
INPUT GAIN BOOST SELECTOR SWITCH: Gainselector(ON=+15dB)
INPUT SELECTOR SWITCH:ModeselectbetweenMICandLINEinputsignals.
INPUT PHANTOM POWER SELECTOR SWITCH
AC POWER: Standard3-poleIEC320connectorcontainingprimaryfusefortheunit.
12
13
19
18 20 21
14
15
16
17
18
19
20
21
Gain boost Phantom
Gain boost Phantom
MIC LINE MIC LINE
INPUT 2
INPUT1
OUTPUT
PHASE
STATUS
0.1A
+12V
LOOP OUTPUT
CHANNEL A CHANNEL B
Induction Loop Driver
AC POWER INPUT
230V
45 - 65Hz
Power: 85W
Fuse: T 630mA L
Designed and Engineered in the UK
Serial No
DC OUTPUT
MLD5
LOOP O/P CONNECTIONS
1-
2-
1+
2+
01
36
30
24
18
12
6
INPUT 1 INPUT 2 MLC
AGC (dB)
7.0
5.5
3.5
2.5
1.8
1.2
CURRENT (A pk)
CLIP
LOOP
CLIP
LOOP
CH BCH A TEMP
MLD5
01 01 01 01
INDUCTION LOOP DRIVER
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Ampetronic MLD5 Installation HandbookPage 8
TROUBLESHOOTING
Ear symbol not illuminated
•CheckthatthepowerswitchistoggledtotheON(I)position.
•Checkfusecontinuity.A20mmfuseisincorporatedintotheACPOWERinlet.Itisnecessary
toremovethepowercordbeforeextractingthefuseholder.Testthecontinuityofthefuse
usingamultimeter.Asparefuseisprovidedinthefuseholder.

 
 
AnyreplacementfuseMUSTbeofthesameratingandtypeasprintedontherearof
theunit.
Ear symbol flashing continuously
Amplierhasfailedselftestandisinsafemode.Signalwillnotbefedintooneorbothloops.
Switchtheunitoff,removeallconnectionsexcepttheloopandpowerconnections,turnallfront
panelcontrolstominimumandswitchbackon.Iftheproblempersists,contactAmpetronicfor
advice.
COMPRESSION LEDs not illuminating
Checkinputconnections.
Ensurethattheappropriatefrontpanelcontrol(INPUT1orINPUT2)isturnedup.Checkthereis
sufcientsignallevelfortherequiredinput.
CURRENT LEDs not illuminating
Therearemanypossiblecausesforthis:
•ChecktheCOMPRESSIONLEDsareilluminating.
•CheckthattheCURRENTcontrolsareturnedupsufciently.
•ChecktheLOOP,orTEMPLEDsarenotilluminated.
•EnsuretheEarsymbolisilluminatedandnotashing.
•Checkthattheloopcablesareconnected,terminatedcorrectlyandinsertedintotheLOOP
OUTPUTsockets.
•Checktheloopsarenotopencircuit,shortcircuit,orconnectedtoearth(seeinstabilityorhigh
frequencynoisesectionofTroubleshooting)
•Switchtheunitoffandturnbackon.
Note: You can listen to the actual loop signal by using a pair of headphones plugged into the
monitor socket. Channel A = left, channel B = right.
CLIP LED(s)illuminated
Indicatesthattheoutputvoltageisclipping.Occasionallightingofthisindicatorisnormalonpeaks
ofsignal.
•TurndowntheCURRENTcontrolonthechannel(s)inquestiontoavoidcausingtheoutput
voltagetoclip.
•Checktheloopisnotopencircuit,shortcircuit,orconnectedtoearth(seeinstabilityorhigh
frequencynoisesectionofTroubleshooting)
•Checktheloopiswithinspeciedlimits.
TEMP LED illuminated
Indicatesthattheinternalheatsinkistoohot.Loopcurrentisnotdeliveredtoeitherchannel.
•Ensurethattheunitisinstalledinalocationwithsufcientventilation