Instruction Manual for AE Techron models including: 9205, 9305, 9205 9305 Multi Channel Digital Amplifiers, 9205 9305, Multi Channel Digital Amplifiers, Channel Digital Amplifiers, Digital Amplifiers, Amplifiers
9205/9305 - AE Techron
9205/9305 Amplifiers | AE Techron
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DocumentDocument9205/9305 Operator's Manual Wide-Bandwidth, High-Power, Multi-Channel Digital Amplifiers 574.295.9495 | www.aetechron.com 2507 Warren Street, Elkhart, IN 46516 Three-Year, No-Fault Warranty SUMMARY OF WARRANTY AE TECHRON INC., of Elkhart, Indiana (Warrantor) warrants to you, the ORIGINAL COMMERCIAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW AE TECHRON INC. product, for a period of three (3) years from the date of purchase, by the original purchaser (warranty period) that the product is free of defects in materials and workmanship and will meet or exceed all advertised specifications for such a product. We further warrant the new AE Techron product regardless of the reason for failure, except as excluded in the Warranty. ITEMS EXCLUDED FROM WARRANTY ThisAETechronWarrantyisineffectonlyforfailure of a new AE Techron product which occurred within the Warranty Period. It does not cover any product which has been damaged because of any intentional misuse, or loss which is covered under any of your insurance contracts. This warranty does not extend to any product on which the serial number has been defaced, altered, or removed. It does not cover damage to loads or any other products or accessories resulting from AE TECHRON INC. product failure. It does not cover defects or damage caused by the use ofunauthorizedmodifications,accessories,parts,or service. WHAT WE WILL DO We will remedy any defect, regardless of the reason for failure (except as excluded), by repair or replacement, at our sole discretion. Warranty work can only be performed at our authorized service centers or at our factory. Expenses in remedying the defect will be borne by AE TECHRON INC., including one-way surface freight shipping costs within the United States. (Purchaser must bear the expense of shipping the product between any foreign country and the port of entry in the United States and all taxes, duties, and other customs fees for such foreign shipments.) HOW TO OBTAIN WARRANTY SERVICE When you notify us or one of our authorized service centers of your need for warranty service, you will receive an authorization to return the product for service. All components must be shipped in a factory pack or equivalent which, if needed, may be obtained from us for a nominal charge. We will take corrective actions and return the product to you within three weeks of the date of receipt of the defective product, or will make available to you a product of equal or better performance on temporary loan until your product can be repaired or replaced and returned to you. If the repairs made by us are not satisfactory, notify us immediately. DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES You are not entitled to recover from us any consequential or incidental damages resulting from any defect in our product. This includes any damage to another product or products resulting from such a defect. WARRANTY ALTERATIONS No person has the authority to enlarge, amend, or modify this warranty. The warranty is not extended by the length of time for which you are deprived of the use of this product. Repairs and replacement parts provided under the terms of this warranty shall carry only the unexpired portion of this warranty. DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured. LEGAL REMEDIES OF PURCHASER There is no warranty that extends beyond the terms hereof. This written warranty is given in lieu of any oral or implied warranties not contained herein. We disclaim all implied warranties, including, without limitation,anywarrantiesofmerchantabilityorfitness for a particular purpose. No action to enforce this Warranty shall be commenced later than ninety (90) days after expiration of the warranty period. This statement of warranty supersedes any others contained in this manual for AE Techron products. AE TECHRON INC. Customer Service Department 2507 Warren St. Elkhart, IN, 46516, U.S.A. (574) 295-9495 www.aetechron.com Contents 1 Introduction ....................................................................................................................................5 1.1 Features ................................................................................................................................5 2 AmplifierUnpackingandInstallation ..............................................................................................6 2.1 Safety First ............................................................................................................................6 2.2 Unpacking .............................................................................................................................6 2.3 Installation .............................................................................................................................6 3 Connections and Startup ...............................................................................................................7 3.1 ConnectingtheLoad .............................................................................................................7 3.2 ConnectingtheInputSignal ..................................................................................................7 3.3 Optional Controls and Connectors ........................................................................................8 3.4 ConnectingtheACSupply ....................................................................................................8 4 AmplifierOperation ......................................................................................................................10 4.1 Front-Panel Controls and Indicators....................................................................................10 4.2 Back-Panel Controls & Connectors.................................................................................... 11 5 AdvancedConfiguration...............................................................................................................13 5.1 DIPSwitchConfigurations...................................................................................................13 5.2 Custom Compensation........................................................................................................16 6 Applications..................................................................................................................................17 6.1 EmergencyStandbySwitchorSafetyInterlock .................................................................17 6.2 Controlled-Voltagevs.Controlled-CurrentModesofOperation ..........................................17 6.3 DrivingReactiveLoads .......................................................................................................20 7 Maintenance ................................................................................................................................21 7.1 CleanAmplifierFilterandGrills ...........................................................................................21 8 Troubleshooting ...........................................................................................................................22 8.1 Introduction & Precautions ..................................................................................................22 8.2 NoSignal.............................................................................................................................22 8.3 NoLEDsIlluminated............................................................................................................22 8.4 Over/UnderLineLEDLit .....................................................................................................22 8.5 Run/StandbyLEDRemainsAmber .....................................................................................22 8.6 AmplifierOverheats(OverTempFaultCondition)...............................................................22 8.7 FaultLEDisIlluminated ......................................................................................................23 8.8 Factory Service ...................................................................................................................23 9205/9305OPERATOR'SMANUALSECTION 1 Figure1.19205FrontPanel 1 Introduction Performance Overview Congratulationsonyourpurchaseofa9205or 9305digitalpoweramplifier.9205/9305 amplifiers Bandwidth DC - 250 kHz are200Vp,DC-to-250kHzcapableamplifiersthat Minimum Drop/Rise Time 7 µs offerauniquecombinationofswitch-modeefficiencyandlinear-amplifier-likefidelityinacompact, portablepackage.Theyareabletodrivevirtually Slew Rate Max Voltage Upto150V/µs 200 Vp any type of load without a reduction in rated power, whilemaintaininglowdistortionandlowDCdrift. 9205/9305amplifiersareagreatchoicewhen availableACMainspowerislimitedormay Max Current Distortion Max Long-Term Power Upto40Ap per channel <0.1%at1kHzbelowclip 5.0 kW change.The9205/9305amplifiercouplesan85% operatingefficiencywithauniversal,100V-to-250V powersupplywithPFC(powerfactorcorrection). Thishighlyefficientsupplycandrawupto30% demandsforeachchannelovertime,suchasMRI systems,multi-channelpositioningsystems,or multi-element sonar. morepowerfromagiven-sizeACMainsbreaker LowTHD+NandIMDdistortionandlowDCdrift whileputtinglessnoisebackontheACmains. make9205/9305amplifiersidealformanyin- Combined,thesefeaturespermita9205/9305amplifiertoproduceupto2kWoutputwhenconnected to a 20A, 120V mains supply and up to 5 kW from 230V or 240V sources. Plus, they can move seamlesslyfromlabtofactorysincetheycanbepowered fromanynormal,single-phase,ACMainssupply. With a slew rate of up to 150 V/µs and a minimum drop/risetimeof7µs,9205/9305amplifiersarefast enoughtomeetthesurgeanddropoutrequirementsofmanycurrentEMCteststandards. dustrial multi-channel applications. Because the 9205/9305amplifier'soutputsareground-referenced,theycanbeusedtocreatethree-phase, wide-bandwidthvoltagesources. Altogether,9205/9305amplifiersareagreatsolutionforawiderangeofhigh-current,low-voltage, low-noiseapplicationsthatrequirewidebandwidth andtheabilitytodrivereactiveorwidelyvarying load impedances. Features 9205/9305amplifiersareavailableintwo-and three-channelversions,withallchannelsdrawing powerfromtheamplifier'scommonpowersup- · Availablein2-or3-channelversions · Operateasavoltage-controlledvoltagesource orvoltage-controlledcurrentsource. ply.Thisdesignallowspowertoshiftdynamically · Four-quadrantoperation. betweenchannelsduringoperation,soupto4500 wattsofthepowersupply'spotential5000watts canbeavailableatanygivenmomentforuseby anysinglechannel.Thisdynamicpowercapability makesthe9205/9305amplifierabletoperformlike · Adjustablegain. · Stablewhendrivinghighlycapacitiveloads. · User-selectablecurrentlimittoprotectfragile DUTsorwherespecifiedinaStandard. amuchmorepowerfulamplifier,makingitwell- · DCenabledorDCblockedandDCServo(for suited for applications that have intermittent power drivingtransformer-coupledloadsorcoils). 96-8007431_06-26-2024 Information subject to change 5 9205/9305OPERATOR'SMANUALSECTION 2 Figure2.19305BackPanel 2 Amplifier Unpacking and Installation 9205/9305amplifiersareprecisioninstruments thatcanbedangerousifnothandledproperly. LethalvoltagesarepresentinboththeACinput supplyandtheoutputoftheamplifiers.Forthis reason,safetyshouldbeyourprimaryconcern whenyousetupandoperateyouramplifier. 2.1 Safety First Throughoutthismanualspecialemphasisis placedongoodsafetypractices.Thefollowing graphicsareusedtohighlightcertaintopicsthat requireextraprecaution. materialsasevidenceofdamageand/orforreturningtheamplifierforrepair. 2.3 Installation The9205/9305amplifierispackagedinarugged powder-coatedchassis.Thischassisis2U(rack units)tall,andhasrack"ears"oneachsideofthe frontpanelformountingtoastandardEIA(ElectronicIndustriesAssociation)rack.Usestandard rackmountinghardwaretomounttheamplifier.Usenylonwashersifyouwishtoprotectthe powder-coatfinishonthefrontoftheamplifier. WARNING WARNING alerts you to hazards that could result in severe injury or death. Note the explanation of the hazard and the instructions for avoiding it. CAUTION CAUTION indicates hazards that could result in potential injury or equipment or property damage. Once again, note the explanation of the hazard and the instructions for avoiding it. Optionally,theamplifiercanbeplacedona benchtop;pleasekeepinmindthattheprotective powder-coatingcanbescratchedwhenplaced onotherequipmentoronabenchtop,especially when there is dirt present. Allow ample space on the sides and especially thebackoftheamplifierforheatedairtoescape. Theamplifiershouldbemountedinarackthatis adequatelyventilatedandnotsealed.Likewise, thefrontoftheamplifiershouldbeunobstructedto allowcoolairtoentertheamplifier. 2.2 Unpacking Allamplifiersaretestedandinspectedfordamagebeforeleavingthefactory.Carefullyunpack andinspecttheamplifierfordamage.Please note any damage for future reference and notify the shipping company immediately if damage is found.Also,pleasesavetheshippingcartonand CAUTION Do not operate the amplifier in a small sealed chamber of any kind. Improper operations and overheating will result. 6 Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 3 3 Connections and Startup Thissectiondetailsthewiringandstartupproceduresfora9205/9305amplifieroperatingin Controlled-Voltagemode(factorydefault).Before connectingtheamplifierinputsandoutputs,make sure AC power is disconnected. tiveterminalsalsocanbeconnectedtoanexternal groundpointsuchastherackchassis,ifdesired. See Figure 3.1. Testing Before Controlled-Current Operation IMPORTANT: IfyourapplicationrequiresControlledCurrentoperation,the9205/9305amplifier firstshouldbewiredandtestedinControlledVoltagemodetoverifythattheamplifierandinput signalareoperatingcorrectly.Onceproperoperationisconfirmed,refertotheApplications sectionofthismanualforinstructionsonconfiguring andoperatingyouramplifierinControlled-Current mode. Figure3.1ConnectingtheLoad Be sure to install the output safety covers after wiringtheoutputconnections.SeeFigure 3.2. 3.1 Connecting the Load 3.1.1 Preparation and Cautions Before connecting the amplifier, make sure the AC power is disconnected. Always use the appropriate wire size and insulationforthemaximumcurrentandvoltageexpected at the output. Never connect the output of the amplifiertoanyothermodelamplifier,powersupply,signalsource,orotherinappropriateload;fire can result. WARNING Figure3.2OutputSafetyCover 3.2 Connecting the Input Signal AnunbalancedBNCconnectorforeachchannel isprovidedontheamplifierbackpanelforsignal input.Connectyourinputsignalsourcetoeach connector as shown in Figure 3.3.Usecables ELECTRIC SHOCK HAZARD. Output potentials can be lethal. Output cover must remain installed at all times to protect against HAZARDOUS LIVE VOLTAGES 3.1.2 Output Connections Connectiontotheoutputsoftheamplifieristo high-current,two-terminalbarrierblocks.Two sets of output connectors are provided on the 9205backpanel,andthreesetsareprovidedon the9305backpanel.Wiresterminatedwith#10 spadeorringterminalsarerecommendedwhen connectingtotheoutputterminals.Connectthe load for each channel across the terminals marked "+"(positive)and""(negative/ground). Thenega- Figure3.3WiringforInputConnectors 96-8007431_06-26-2024 Information subject to change 7 9205/9305OPERATOR'SMANUALSECTION 3 thatarehighqualityandshieldedtominimize noiseandtoguardagainstpossiblefeedback. 3.3 Optional Controls and Connectors Thefollowingcontrolsandconnectorsareprovidedontheamplifierbackpaneltoallowforadditionalmonitoring,configurationandcontrolofthe amplifieroutput. 3.3.1 Current Monitor Connectors UnbalancedBNCportsareprovidedontheamplifierbackpanel,oneforeachchannel,toallowfor connectiontocurrentmonitoringequipment.The current monitor output is 1V = 20A. 3.3.2 DIP Switches DIPswitchesprovidedontheamplifierbackpanel canbeusedtoenablefeaturesorconfigurethe amplifierforspecialapplications.SeetheAdvanced Configuration section of this manual for moreinformation.Beforeoperatingtheamplifier, check to make sure all DIP switches are set as intended. WARNING Inletwiringmustsupporttheratedcurrent. Theamplifiermustbeprotectedbyfusesorcircuit breakersthatprotectthepowerinletwiringwitha maximumratingofnomorethan30A. 3.4.2 AC Inlet Connections AlwaysoperatetheamplifierfromtheproperAC mains.9205/9305amplifiersrequiresingle-phase, 50-60 Hz, 100-250 VAC, at 30A with no more than ±10%varianceaboveorbelowthelinevoltage. Theamplifierwillnotoperateproperlyoutside these limits. ConnectprotectivegroundingterminaltoACmains groundbeforeturningonpowertopreventelectric shock hazard. Donotdisconnectordisabletheprotective groundingconnection.Doingsocausesapotential electrical shock hazard. ConnecttheACsupplytothethree-terminalbarrierstriplocatedontheamplifierbackpanel(see Figure 3.5). The risk of lethal ELECTRICAL SHOCK exists when connecting AC mains! Disconnect the source before connecting AC power wires to the amplifier's AC inputs. 3.4 Connecting the AC Supply 3.4.1 Disconnect and Inlet Wiring Protection A safety disconnect device for the AC mains input mustbeinstalledsothatitisbothnearbyandaccessibletotheoperator.Thedisconnectmustbe clearlylabeled. LINE 2 / NEUTRAL GND LINE 1 Figure3.5ACMainsBarrierStripWiring 8 Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 3 Start-up Procedure 1. Turndownthelevelofyoursignalsourceoneachchannelbeing utilized. 2. Pressthefront-panelStandby-Run switchtotheRunpositiontoenergizetheamplifier. 3. WaituntiltheRun/Standbyindicator turnssolidgreenoneachchannel beingoperated. 4. Foreachchannelbeingoperated, adjustyourinputsignallevelto achieve the desired output level. 96-8007431_06-26-2024 Information subject to change 9 9205/9305OPERATOR'SMANUALSECTION 4 4 Amplifier Operation 4.1 Front-Panel Controls and Indicators This section provides an overview of Front-Panel controls and indicators found on the 9205/9305 amplifier.ReferfoFigure 4.1 for component locations. 4.1.1 Standby-Run Switch TheStandby-Runswitchcontrolsthepowertothe amplifier'shigh-voltagetransformers. Switch to the Run position (right) to energize the amplifier. Switch to the Standby position (left) to remove power from the high-voltage transformers and place the amplifier in Standby mode. 4.1.2 Run/Standby Indicator (one per channel) Run mode: Theindicatorwillbelitsolidgreen. Theamplifier'shigh-voltagetransformersareenergizedandtheunitwillamplifytheinputsignalto that channel. Standby mode: Theindicatorwillbelitsolidamber.TheamplifierwillbeplacedinStandbywhen oneofthefollowingconditionsoccurs: 1. Power Supply condition 2. Overtemp condition 3. Over Current condition 4. Theusersetsthefront-panelStandby-Run switchtotheStandby(left)position. InStandbymode,theamplifier'slow-voltage powersupplyisenergizedbutthehigh-voltage power supply is not. ToreleasetheamplifierfromStandbymode: 1. Power Supply condition: Iftheamplifier's PowerSupplyindicatorislit,theamplifieris tryingtoabsorbtoomuchpower.Turnthe amplifier'sfrontStandby-Runswitchtothe Standbyposition,andtheneitheradjustthe inputsignal(s)ortheload(s)tolowerthepower beingreturnedtotheamplifier.TurntheStandby-RunswitchtotheRunpositiontoresume amplifieroperation. IfboththePowerSupplyandOverloadindicatorsarelit,toomuchpowerisbeingdrawn from the power supply. This condition often occursduetohigh-currentoperationintoa verysmallload.Turntheamplifier'sfront Standby-RunswitchtotheStandbyposition, thenreducetheinputsignal(s)orincreasethe impedanceoftheload(s)tolowerthecurrent requirements.TurntheStandby-Runswitchto theRunpositiontoresumeamplifieroperation. 2. Overtemp condition: This condition often occurswhentherequiredpowerexceedstheamplifier'scapabilities.Removetheinputsignal(s) fromtheamplifierandleavetheamplifierwith theStandby-RunswitchintheRunposition andwiththefansoperatingtocooltheamplifier.Whentheamplifier'sinternaltemperature dropstolessthan100°C,theamplifierwill resume operation. Iftheamplifiercontinuestooverheatwhile operatingwithintheamplifiier'scapabilities,the amplfiiermayrequiremaintenance.Seethe Troubleshooting section for more information. 10 Figure4.19305FrontPanelControlsandIndicators Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 4 3. Over Current condition: This condition can occurwhenaveryhighcurrentisbeingdrawn fromtheamplifier.Lowertheoperatinglevel oftheamplifier,thenturntheamplifier'sfrontpanelStandby-RunswitchtoStandbyandthen backtoRuntoresettheamplifier.Ifthefault condition recurrs or does not clear, the amplifiermayrequireservicing.SeetheTroubleshooting section for more information. 4. Standby-Run switch pressed: When the amplifierisoperating(Runmode),settingthe front-panelStandby-RunswitchtotheStandby position(left)willplacetheamplifierinStandby mode.SettheswitchtoRun(right)torelease theamplifierfromStandbyandreturntheamplifiertoRunmode. 4.1.3 Signal / Overload Indicators (one per channel) Signal Presence: Whenaninputsignalispresentedatanactivesignalinputontheamplifier atalevelgreaterthan0.5V,theSignal/Overload indicatorwilllightsolidgreen. Overload (clipping): Theindicatorwillflash amberintermittently.Whentheindicatorflashes amber,thisindicatesthattheoutputofthesystem couldnotfollowtheinputsignalduetovoltage orcurrentlimits.TheamberOverloadindicator willbeginflashingwhendistortionisgreaterthan 0.1%. 4.1.4 Power Supply Indicators (one per channel) Thisamberindicatorwillilluminate,andtheamplifierwillbeplacedinStandbyundertwoconditions: · Theamplifierissinkingtoomuchpower.Under these conditions, typically only the Power Supplyindicatorwillbelit. · Toomuchpowerisbeingdrawnfromthepower supply.Thisconditionoftenoccursduetohighcurrentoperationintoaverysmallload.Under theseconditions,boththePowerSupplyand theOverloadindicatorswilltypicallybelit. ToremovetheamplifierfromStandby,firstswitch theamplifier'sfrontStandby-Runswitchtothe Standbyposition.Thenadjusttheinputsignalor theloadtolowerthepowerrequirementsorthe powerbeingreturnedtotheamplifier. TurntheStandby-RunswitchtotheRunposition toresumeamplifieroperation.IfthePowerSupply indicatordoesnotturnofforiftheamplifierdoes notreturnfromStandby,theamplifiermayrequire servicing.SeetheTroubleshooting section for more information. 4.1.5 Overtemp / Over Current Indicator (one per channel) Overtemp Condition: Theamplifiermonitorsthe temperatureinsidethehigh-voltagepowersupply andintheoutputstageheatsinks.TheOvertemp /OverCurrentindicatorwilllightamberandthe amplifierwillbeplacedinStandbymodewhenthe temperature sensors detect a condition that would damagetheamplifier.IftheOvertemppulseis extremelyshort,asinthecaseofdefectivewiring orswitches,thisindicatormaybelittoobrieflyto observe. ToremovetheamplifierfromStandbyandreturn it to normal operation after an Overtemp fault has 96-8007431_06-26-2024 Information subject to change 11 9205/9305OPERATOR'SMANUALSECTION 4 occurred,makesuretheStandby-Runswitch isintheRunpositionandtheamplifierfansare running,andthenremovetheinputsignalfrom theamplifier.AllowthefanstorununtiltheamplifierautomaticallyreturnstoRunmode.Seethe Troubleshooting section for information on identifyingandcorrectingthecauseofanOvertemp fault condition. Over Current Condition: Theamplifiermonitors thecurrentlevelsproducedattheamplifieroutput. TheOvertemp/OverCurrentindicatorwilllightred andtheamplifierwillbeplacedinStandbymode when the current sensors detect operation at the amplifier'speakcurrentlevelformorethan500 ms. An Over Current condition can occur when the amplifierisoperatedathighlevelsintovery-lowimpedanceloads(below0.25ohms). ToremovetheamplifierfromStandbyandreturnit to normal operation after an Over Current fault has occurred,completethefollowingsteps: 1. Turnoffthesignalsource. 2. Setthefront-panelStandby-Runswitchtothe Standbyposition(left). 3. TurnofftheACmains. 4. TurnACmainspowerbackon.IftheOverCur- rent(red)LEDdoesn'tilluminateagain,press theStandby-Runswitchtoplacetheamplifier inRunmodeandturnthesignalsourceon. 5. IftheOverCurrentLEDisstillilluminatedand theFaultconditiondoesn'tclear,returnthe amplifierforFactoryService.SeetheFactory Service information at the end of the Troubleshooting section of this manual. 4.2 Back-Panel Controls & Connectors This section provides an overview of Back-Panel controls and connectors found on the 9205/9305 amplifier.PleaserefertoFigure 4.2 for component locations. Configuration DIP Switches (one set per channel) This set of 12 DIP switches provides various functionsandallowstheamplifierchanneltobe configuredforspecialapplications.Seethe"Advanced Configuration" section for more information. Current Monitor Connectors (one per channel) ThisunbalancedBNCportallowsforconnection tocurrentmonitoringequipment.Thecurrentmonitor output is 1V = 20A. Unbalanced BNC Input Connectors (one per channel) This BNC connector provides a standardunbalancedinput. Output Terminals (one pair per channel) Connectoutputlinesfromtheloadtothispairofhighcurrentoutputterminalsusing#10spadeorring terminals. AC Power Input Three-terminalbarrierstrip connector. 12 Figure4.29305BackPanelControlsandConnectors Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 5 5 Advanced Configuration The9205/9305amplifierwasdesignedtoofferexceptional versatility in operation. You can choose fromarangeoffield-configurableoptions,including: · EnableDCServotoensureDCoffsetremains at zero and safely drive coils and transformers. · SelectControlled-CurrentorControlled-Voltage modes of operation. · Selectbetweentwocompensationnetworksfor ControlledCurrentoperation:CC1,designed forloadsfrom10µHto500µH;orCC2,designedforloadsfrom500µHto2mH. · Select DC-coupled or AC-coupled operation. · Adjusttheamplifiergainfrom2.5to20inincre- ments of 2.5. · Limitcurrentoutputfrom15Ato60Ainincre- ments of 15A. 5.1 DIP Switch Configurations The9205/9305amplifierprovidesasetof12DIP switchesperchannellocatedontheamplifierback panel.Mostconfigurationsettingsforachannel canbemadeusingtheseDIPswitches.SeeFigure 5.1 fordefaultDIPswitchsettingsanddescriptions. SW#1: DC Servo TheDCServofunctionensuresthatnoDCoffset ispresentatthesignaloutput(-3dBat3Hz). SelectDCServowhendrivingtransformersorother coils. When the DC Servo DIP switch is in the RIGHTposition,theDCServofunctionisenabled. WhenthisswitchisintheLEFTposition(default), theDCServofunctionisdisabled. 9205/9305 Default DIP Switch Settings OFF ON Red = Default 1 1 DC SERVO OFF ON 2 2 OPERATION MODE CC CV 3 3 COMPENSATION NETWORK 2 OFF ON 4 4 COMPENSATION NETWORK 1 OFF ON 1 5 CONTROL CONFIGURATION FOLLOWER MASTER 2 6 COUPLING AC DC 3 4 5 7 GAIN BIT 3 (MSB) 8 GAIN BIT 2 9 GAIN BIT 1 (LSB) ALL OFF = 2.5 ALL UP = 20 OFF 10 OFF 5 OFF 2.5 6 10 ELECTRONIC GAIN MATCHING OFF ON 7 11 CURRENT LIMIT BIT 1 BOTH OFF=15Ap OFF +30Ap 8 12 CURRENT LIMIT BIT 2 BOTH ON=60Ap 0FF +15Ap NOTE: GRAY TEXT INDICATES SWITCH USED FOR FACTORY CONFIGURATION ONLY. ALL BIT SWITCHES ARE ADDITIVE. RIGHT = ON. Figure5.1DefaultDIPSwitchSettingsandDescriptions 96-8007431_06-26-2024 Information subject to change 13 9205/9305OPERATOR'SMANUALSECTION 5 SW#2: Operation Mode WhentheOperationModeDIPswitchisinthe RIGHTposition(default),theamplifierchannel willoperateinControlled-Voltagemode,andthe channel'soutputvoltagewillbecontrolledbyits inputvoltagesignal.Whenthisswitchisinthe LEFTposition,theamplifierchannelwilloperatein Controlled-Currentmode,andthechannel'soutput currentwillbecontrolledbyitsinputvoltagesignal. IMPORTANT: Controlled-Current operation requirestheuseofacompensationnetwork.The 9205/9305amplifierprovidestwoinstalledcompensationnetworksforeachchannel:onenetworkissuitableforloadsfrom10H to 500 H; theotherissuitableforloadsfrom500H to 2 mH. For more information on Controlled-Current operation,includinginstructionsforselectingthe bestcompensationoptionforyourapplication, seethetopic"ControlledCurrentOperation"inthe Applications section of this manual. If neither of theavailableRCnetworksissuitableforyourapplication, please contact AE Techron Technical Support. SW#3: Compensation Network 2 Whenachannelofthe9205/9305amplifierisused in Controlled-Current mode, the current control loopistunedwithanRCnetwork.Thefactorydefaultnetwork(CompensationNetwork1)provides 49.9k ohm resistance and 47 nF capacitance and shouldbeusedwithloadsthatare10µHto500 CAUTION Do not change the setting of the Operation Mode switch while the amplifier is operating (Run mode). Damage to the amplifier or the load can occur. Place the amplifier in Standby mode by pressing the front-panel Standby-Run switch before changing the Operation Mode setting on any channel. µH.Ifthisdefaultnetworkisnotadequateforyour application and load, the Compensation Network 1switchcanbeturnedoffandtheCompensation Network2switchcanbeusedtoenableanetwork that provides 80.6k ohm resistance and 220 nF CAUTION InControlled-CurrentMode,theloadispartoftheamplifier channel'scircuit,andtherelationshipoftheloadtotheamplifieriscritical.ForproperandsafeoperationinControlledCurrentmode,youmustobvervethefollowingguidelines: 1. Properly attach a load before operating the amplifier channel. 2. DO NOT use a blocking capacitor. The load must have a DC path. 3. Never leave the load open. Ifyoufeeltheloadmustbe fused, which could lead to a potential open circuit, please contact AE Techron Technical Support. 4. Check to make sure the load has some inductive component. 5. Provide appropriate Compensation for the load, using either Compensation Network 1 (SW#4) or Compensation Network 2 (SW#3). If neither compensation network isadequateforyourload,contactAE Techron Technical Support. 6. Turn off the amplifier immediately if oscillation occurs. Failure to follow these guidelines may result in damage to the amplifier or load. capacitanceandshouldbeusedwithloadsthat are 500 H to 2 mH. NOTE: It is recommended to only use one of the compensationnetworksatatime.HavingSW#3 andSW#4bothon(RIGHT)willlikelyprovideimproper compensation for the load, and may result in amplifierinstability. For more information on Controlled-Current operation,includinginstructionsforselectingthebest compensationsettingforyourapplication,seethe topic"ControlledCurrentOperation"intheApplications section of this manual. If neither of the availableRCnetworksissuitableforyourapplication, please contact AE Techron Technical Support. SW#4: Compensation Network 1 Whenthe9205/9305amplifierisusedinControlled-Current mode, the current control loop is tunedwithanRCnetwork.The Compensation Network1switchenablesthefactorydefaultRC network. This provides 49.9k ohm resistance and 47 nF capacitance andshouldbeusedwithloads that are 10 H to 500 H. If this default network 14 Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 5 isnotadequateforyourapplicationandload,the CompensationNetwork1switchcanbeturnedoff andtheCompensationNetwork2switchcanbe used to enableanetworkthatprovides80.6kohm resistanceand220nFcapacitanceandshouldbe used with loads that are 500 H to 2 mH. NOTE: It is recommended to only use one of the compensationnetworksatatime.HavingSW#3 andSW#4bothon(RIGHT)willlikelyprovideimproper compensation for the load, and may result in amplifierinstability. For more information on Controlled-Current operation,includinginstructionsforselectingthebest compensation option for your application, see the topic"ControlledCurrentOperation"intheApplications section of this manual. If neither of the availableRCnetworksissuitableforyourapplication, please contact AE Techron Technical Support. SW#5: Control Configuration Usedforfactoryconfigurationonly. SW#6: Coupling WhentheCouplingDIPswitchisintheRIGHT position(default),theamplifierchannelcanreceive andamplifybothDCandACsignal.Whenthis switchisintheLEFTposition,a30-Hzhigh-pass filterontheinputpreventsthetransmissionofDC signal. SW#7 SW#9: Gain Thegainfortheamplifierchannelcanbeadjusted from2.5to20inincrementsof2.5usingswitches 7through9.Allswitchesareadditiveandprovide thefollowingvaluestowardthetotalGainamount: SW#7=10.0,SW#8=5.0,SW#9=2.5.Referto Figure 5.3 forallavailablegainswitchsettings. ON=DIPSwitchRIGHTOFF=DIPSwitchLEFT SW#7 SW#8 SW#9 Gain ON ON ON 20.0 ON ON OFF 17.5 ON OFF ON 15.0 ON OFF OFF 12.5 OFF ON ON 10.0 OFF ON OFF 7.5 OFF OFF ON 5.0 OFF OFF OFF 2.5 Figure5.3GainSwitchConfigurations SW#10: Electronic Gain Matching Used for factory configuration only. SW#11 - #12: Current Limit These two switches control the current-limit settingsfortheamplifierchannel.Whenbothswitches areintheRIGHTposition(default),theamplifier channel'soutputcurrentislimitedto60A.The current-limitcanbeloweredin15Aincrementsby settingoneormoreofthecurrentlimitswitchesin theLEFTposition.RefertoFigure 5.4 for all availablecurrent-limitswitchsettings. ON=DIPSwitchRIGHTOFF=DIPSwitchLEFT SW#11 SW#12 Current Limit ON ON 60A ON OFF 45A OFF ON 30A OFF OFF 15A Figure5.4CurrentLimitSwitchConfigurations 5.2 Custom Compensation Ifyouwishtochangeoneofthetwostandard compensations to a custom compensation, please contact AE Techron Technical Support forspecific instructions. 96-8007431_06-26-2024 Information subject to change 15 9205/9305OPERATOR'SMANUALSECTION 6 6 Applications 6.1 Controlled-Voltage vs. ControlledCurrent Modes of Operation AETechron9205/9305amplifierscanbefieldconfiguredtohaveoneormorechannelsoperate as a Voltage Amplifier(Voltage-ControlledVoltageSource)orasaTransconductance Amplifier (Voltage-ControlledCurrentSource).Themode selectionismadeviatheback-panelDIPswitch #2.SeetheAdvanced Configuration section for more information. WhenconfiguredasaControlled-Voltage source (voltageamplifier),thechannelwillprovidean outputvoltagethatisconstantandproportionalto thecontrol(input)voltage.Iftheload'simpedance changes,the9205/9305willseektomaintainthis ratioofinputtooutputvoltagebyincreasingor decreasingthecurrentitproduces,aslongasitis withintheamplifier'sabilitytocreatetherequired current.Usethismodeifyouwanttheoutputvoltagewaveformtobeliketheinputwaveform(see Figure 6.1). rentwaveformtobeliketheinputwaveform(see Figure 6.2). Figure6.2InputtoOutputComparison, Controlled-Current Operation 6.1.1 Safety and Operation Considerations for Controlled Current Operation WhenanAETechronamplifierisconfiguredas aControlled-Currentsource,careneedstobe exercisedinitsoperation.Any voltage controlled current source should never be turned on without a load, (with some impedance, real or effective) connected to its output terminals. When asked to operate in this way, any current source(includinganAETechronamplifier)willincreaseitsoutputvoltageinanattempttodrivethe requestedcurrentintotheload.Inanopen-circuit condition,creatingcurrentflowwillbeimpossible. Thecurrentsourcewillincreaseitsoutputvoltage untilitreachesitsvoltagelimit.Thisisapotentially dangerousconditionforboththeAETechronamplifierandforanyuserwhomightcomeincontact withtheamplifieroutputterminals. Figure6.1InputtoOutputComparison, Controlled-VoltageOperation Likewise,operationinControlledCurrentmode into a load that is completely resistive is NOT recommended. The load must have some inductance for Controlled Current mode to operate correctly. Conversely,whenconfiguredasaControlledCurrentsource(transconductanceamplifier),the amplifierwillprovideanoutputcurrentthatisconstantandproportionaltothecontrol(input)volt- WhenoperatinginControlled-Current(CC)mode, acompensationcircuitisrequiredtoensureaccurate output current. Since the load is a critical circuit component in CC mode, the inductive and age.Iftheload'simpedancechanges,theamplifier resistive values of the load will determine the re- willseektomaintainthistransconductance(ratio quiredcompensationvalues. ofinputvoltagetooutputcurrent)byincreasingor decreasingthevoltageitproduces,aslongasitis Oneofthetwocompensationsettingsthatcanbe withintheamplifier'sabilitytocreatetherequired enabledwithDIPswitchsettingswillbesufficient voltage.Usethismodeifyouwanttheoutputcur- for most applications. If you determine that neither 16 Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 6 Compensation Network 1 or Compensation Network2willbeadequateforyourapplicationand load, please contact AE Techron Technical Support for additional compensation options. Thefollowingsectiondescribesmethodsfor determiningpropercompensationsettingforyour applicationwhenoperatinginControlled-Current mode. 6.1.2 Selecting Compensation for CC Operation Oneormorechannelson9205/9305amplifiers canbeconfiguredforeitherControlledVoltage (CV)orControlledCurrent(CC)modeofoperation.WhenoperatingtheamplifierinControlled Voltage(CV)mode,compensationisnotrequired. However,whenoperatinginControlledCurrent (CC)mode,thechannel'sloadbecomesanintegralpartofthesystem.Inordertoensuresystem stabilityandtocontrolavailablebandwidth,compensationviaanRCnetworkisrequiredforCC operation.Thefollowingstepswillshowyouhow to determine the proper compensation network for yourloadtoallowyoutooperateyouramplifier channelinCCmodesafelyandeffectively. STEP 1: Check Amplifier Operation in CV mode. Werecommendthatyoupower-upandenablethe amplifierwithallchannelsinControlledVoltage modeandwithoutattachinganyloadsbeforeconfiguringyouramplifierchannels(s)forControlled Current operation. This will allow you to verify that eachchannelandeachchannel'sinputsignalare operatingcorrectly. Once this initial check is completed, power down theamplifier,attachyourload(s),and,foreach channelrequiringCCoperation,movethebackpanelOperationModeDIPswitch(SW#2)tothe LEFTpositiontoplacethechannelinCCmode. STEP 2: Determine Required Compensation. WhenoperatinganamplifierchannelinControlledCurrentmode,theloadbecomesanintegralpart ofthesystem.Inordertodeterminetherequired compensationforyourload,consultingthefollowingtabletodeterminetheapproximatecompensationcapacitance(CC)requiredbasedonthe inductance of your load. Note that these calculationsarebasedonempiricalmeasurementsand areapproximate. Load Compensation Compensation Inductance (L) Capacitance (CC) Network 10 µH to 500 µH 47 nF Network 1 500 µH to 2 mH 220 nF Network 2 NOTE: Load Resistance (R) is assumed to be <5 ohms. 96-8007431_06-26-2024 Information subject to change 17 STEP 3: Enable Compensation Network Ifyourloadinductanceisbetween10H and 500 H, and your load resistance is less than 5 ohms, then you can likely use Compensation Network 1 for your application. If your load inductance is between500H and 2 mH, and your load resistance is less than 5 ohms, then you can likely use Compensation Network 2 for your application. Thesecompensationnetworksareenabledwhen 9205/9305OPERATOR'SMANUALSECTION 6 CompensationNetwork1DIPswitch(SW#4)or CompensatlonNetwork2DIPswitch(SW#3)for theamplifierchannelissettotheON(RIGHT) position. If your load inductance falls outside of these ranges,orifyourloadresistanceisgreaterthan5 ohms, please contact AE Techron Technical Support for assistance. STEP 4: Verifying Operation Remember the load(s) you are connecting are a part of the system and the amplifier should not be turned on without a load being connected to every channel configured for CC operation. AfterselectingandenablingyourchoiceofCompensation Networks for each channel selected for CC operation, check to ensure that the Operation ModeDIPswitchissettoCC(RIGHT),thenpower uptheamplifierwithoutsignalinput. TobegintestingachannelconfiguredforCC mode,inputasquarewavewithafrequencyof 100Hzto1kHz,orasquaredpulseatalowlevel (typically0.25to2.0volts).Alimited-rise-time, repetitive pulse of low duty cycle is preferred. Observetheoutputcurrentthroughacurrent monitororcurrentprobe.Lookforcleantransition edges.Thepresenceofringingorroundingonthe transitionedgesindicatescompensationproblems. (SeeFigure 6.3.) Ifachangeincompensationisnecessary,please contact AE Techron Technical Support for assistance. DO NOToperateyouramplifierinControlled Current mode without proper compensation. 18 Figure6.3CompensationEffectsonWaveform Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 6 6.2 Driving Reactive Loads Likeallswitchingamplifiers,9205/9305amplifiersareabletoreusetheenergyreturnedfrom reactiveloads.Unlikepurelyresistiveloads,loads withsomereactance(eithercapacitiveorinductive)willstoreenergyduringpartofacycle,and thenreleasesomeofthisenergybacklater.This energyistransferredbacktotheloadthroughthe amplifier'spowersupply.Thisallowtheamplifier to deliver continuous apparent power that is up to fivetimestheratedpoweroftheamplifierwhen drivingreactiveloads. 6.3 Split-Phase Electric Configuration The9205or9305amplifiercanbeconfigured asa240Vsplit-phaseelectricsupply,capableof producing120Vor240Voutput.Toconfigureyour amplifierforthisapplication,completethefollowing steps: 1. Configuration: ThedefaultDIPswitchsettings canbeusedwhenconfiguringtheamplifieras a split-phase supply. See Figure 5.1 for the defaultDIPswitchsettings.Notethatifyour applicationrequiresalternateDIPswitchsettingstoenableoneormoreoptions,werecommendthatthesamesettingsbeusedforboth legsofthesupply. WARNING ELECTRIC SHOCK HAZARD. Output potentials can be lethal. Output cover must remain installed at all times to protect against HAZARDOUS LIVE VOLTAGES 2. Wiring (refertoFigures 6.4 and 6.5) A. Before connecting the amplifier, make sure the AC power is disconnected. Figure6.4Wiringthe9205Amplifierasa240VSplit-PhaseElectricSupply Figure6.5Wiringthe9305Amplifierasa240VSplit-PhaseElectricSupply 96-8007431_06-26-2024 Information subject to change 19 9205/9305OPERATOR'SMANUALSECTION 6 B. Output Connections: Usingwiresterminatedwith#10spadeorringterminals, connect the load across the Channel 1 outputterminalmarked"+"(positive)and theChannel2outputterminalmarked"+" (positive).Connecttogethertheoutputs fromeachchannelmarked""(negative/ ground). C. Be sure to install the output safety covers afterwiringtheouputconnections. D. Input Connections:Configureyourinput signalsourcetoproducesyncedsignals withtherequiredphaseoffsetsandat yourdesiredfrequencyandlevels.ConnectyourinputsignalsourcestotheBNC connectors for each channel as shown in Figures 6.4 and 6.5. 6.4 3-Phase Wye (4 wire) Configuration The9305amplifiercanbeconfiguredasa 3-phase,Wyeelectricsupply,capableofproducing208Voutput.Toconfigureyouramplifierforthis application,completethefollowingsteps: 1. Configuration: ThedefaultDIPswitchsettings canbeusedwhenconfiguringtheamplifieras a 3-phase supply. See Figure 5.1 for the defaultDIPswitchsettings.NotethatifyourapplicationrequiresalternateDIPswitchsettings toenableoneormoreoptions,werecommend thatthesamesettingsbeusedforalllegsof the supply. 2. Wiring (refertoFigures 6.6) A. Before connecting the amplifier, make sure the AC power is disconnected. B. Output Connections: Usingwiresterminatedwith#10spadeorringterminals, connecttheloadtothe"+"(positive)output terminals for Channel 1, 2, and 3. Connect togethertheoutputsfromeachchannel marked""(negative/ground). C. Be sure to install the output safety covers afterwiringtheouputconnections. D. Input Connections:Configureyourinput signalsourcetoproducesyncedsignals withtherequiredphaseoffsetsandat yourdesiredfrequencyandlevels.ConnectyourinputsignalsourcestotheBNC connectors for each channel as shown in Figure 6.6. 20 Figure6.6Wiringthe9305Amplifierasa3-PhaseWyeElectricSupply Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 7 7 Maintenance Simplemaintenancecanbeperformedbytheuser tohelpkeeptheequipmentoperational.Thefollowingroutinemaintenanceisdesignedtoprevent problemsbeforetheyoccur.SeetheTroubleshooting section, for recommendations for restoringtheequipmenttooperationafteranerror condition has occurred. Preventative maintenance is recommended after thefirst250hoursofoperation,andeverythree monthsor250hoursthereafter.Iftheequipment environment is dirty or dusty, preventative maintenanceshouldbeperformedmorefrequently. CAUTION Before you begin, make sure your amplifier is disconnected from the power source. The amplifier's AC input must be completely disconnected from the power source via external mechanical disconnect or breaker. 7.1 Clean Amplifier Filter and Grills 7.1.1 Tools Required Therecommendedequipmentandsupplies neededtoperformthefunctionsrequiredforthis taskaredescribedasfollows. · Vacuum cleaner · Dampcloth(usewateronlyoramildsoap dilutedinwater) Toensureadequatecoolingandmaximumefficiencyoftheinternalcoolingfans,theamplifier's frontandreargrillsshouldbecleanedperiodically. Tocleantheamplifiergrillsandfilter,completethe followingsteps: 1. Disconnecttheamplifierfromitspowersource viaexternalmechanicaldisconnectorbreaker. 2. Thefrontgrillissecuredtotheamplifierfront panelbymagnets.Pulloutonthegrilltorelease it from the front panel. 3. Removethefilterlocatedbehindthefrontgrill. 4. Usingavacuumcleaner,vacuumthefrontven- tilationgrill,thegrillfilter,andthebackventilationexitgrill. 5. Usingadampcloth,cleantheamplifierfront panelandtherearventilationgrills.Alsouse thedampclothtocleanthefrontgrillandfilter. Ifnecessary,thesecanbeimmersedinwarm, soapy water. 6. Drythefrontpanel,filter,andgrillswithaclean cloth or allow to air dry. IMPORTANT: All parts should be completely dry before reconnecting or restarting the amplifier. 7. Reinstallthefilterandreplacetheamplifier frontgrill. CAUTION The front grill is held on by strong magnets. When replacing the front grill, hold the grill by its side edges and be sure to keep fingers clear of the grill back. Pinching injuries can occur if the grill is replaced improperly. 96-8007431_06-26-2024 Information subject to change 21 9205/9305OPERATOR'SMANUALSECTION 8 8 Troubleshooting 8.1 Introduction & Precautions This section provides a set of procedures for identifyingandcorrectingproblemswiththe9205/9305 amplifier.Ratherthanprovidinganexhaustiveand detailedlistoftroubleshootingspecifications,this section aims to provide a set of shortcuts intended togetaninoperativeamplifierbackinserviceas quicklyaspossible. The procedures outlined in this section are directedtowardanexperiencedelectronictechnician; itassumesthatthetechnicianhasknowledgeof typical electronic repair and test procedures. 8.2 No Signal Missingoutputsignalononeormorechannels maybecausedbyoneofthefollowing: 1. TheControlConfigurationDIPswitch(#5)is settotheFollower(LEFT)position.Thedefault settingforthisswitchisMaster(RIGHT)and thissettingshouldonlybechangedattheAE Techron.ReturntheswitchsettingtoMaster (RIGHT)torestorethesignalpath. 2. AsignalsourceisnotconnectedtotheBNC input connector for that channel. See the Amplifier Setup section in this manual for more information on how to correctly connect each channeltoasignalsource. 8.3 No LEDs Illuminated IfnoneoftheLEDsontheDisplayPanelareilluminated,checkthefollowing: 1. The AC mains are not connected or not on (seetheAmplifier Setup section for more information). 8.4 Run/Standby LED Remains Amber WhentheRun/StandbyLEDislitsolidamber,the amplifierisinStandbymode.Pressthefront-panel Standby-RunswitchtotheRunpositiontoplace theamplifierinRunmode. Iftheamplifierdoesnotreturntorunmode,check toseeiftheHigh/LowLine,Overtemp,orFault LEDsarelit,andthenfollowtheinstructionsin thissectionforremedyingthefaultconditionand returningtheamplifiertoRunmode. Iftheremediesgivenfailtorestarttheamplifier, theamplifiermayrequireservicing.SeetheFactory Service Information at the end of this section. 8.5 Power Supply LED Lit ThePowerSupplylightwillcomeonundertwo conditions: 1. Theamplifieristryingtoabsorbtoomuch power. 2. Toomuchpowerisbeingdemandedfromthe amplifier 8.5.1 Sinking Too Much Power This will usually happen when too much power is beingreturnedtotheamplifierfromtheload(s)due totheloadreactancebeingtoohighforthesignal beingdriven.Whenthishappens,thePowerSupplylightwilltypicallybetheonlyfaultindicatorlit. Toclearthefaultcondition,firstturntheamplifier's frontStandby-RunswitchtotheStandbyposition, andtheneitheradjusttheinputsignalortheload tolowerthepowerbeingreturnedtotheamplifier. TurntheStandby-RunswitchtotheRunposition toresumeamplifieroperation. Notethatifmorethanonechannelisbeingused, you may need to adjust more than one channel in ordertooptimizetheoperationoftheamplifier. Iftheamplifierdoesnotreset,theamplifiermay requireservicing.PleaseseetheFactory Service information at the end of this section. 8.5.2 Excessive Power Requirements Thiscanhappenwhenthepowerbeingdemanded fromtheamplifierexceedsthecapabilityofthe power supply to support it. When this happens, boththePowerSupplyLEDandtheOverloadLED willbelit. 22 Information subject to change 96-8007431_06-26-2024 9205/9305OPERATOR'SMANUALSECTION 8 Toclearthefaultcondition,firstturntheamplifier's 2. Visually inspect fans to assure correct opera- frontStandby-RunswitchtotheStandbyposi- tionwhileamplifierisOn(I).Anyinoperative, tion,thenreducetheinputsignalorincreasethe load impedance on one or more channels to lower thecurrentrequirements.TurntheStandby-Run visiblyslow,orreverse-spinningfanshould bereplaced.PleaseseetheFactoryService information at the end of this section. switchtotheRunpositiontoresumeamplifier AnOverTempconditionplacestheamplifierin operation. Standbymode.IftheOverTemppulseisex- Notethatifmorethanonechannelisbeingused, you may need to make adjustments to more than one channel in order to optimize the operation of tremelyshort,asinthecaseofdefectivewiringor switches,theOverTemppulsemaybetoobriefto observe. theamplifier. 8.6.3 Resetting After OverTemp Iftheamplifierdoesnotreset,theamplifiermay requireservicing.PleaseseetheFactory Service information at the end of this section. ToresettheamplifierafteranOverTemphasoccurred,makesurefansarerunning.Removethe inputsignalfromtheamplifierandallowthefans torununtiltheamplifierhascooledsufficientlyand 8.6 Amplifier Overheats (Over Temp Fault Condition) theamplifierautomaticallyreturnstoRunmode. NOTE: Typically,overheatingthatoccursinthe Therearetwopossiblereasonswhythe 9205/9305amplifierisoverheating:Excessive powerrequirementsorinadequateairflow. amplifieroutputsduetoinadequateairfloworvery low impedance loads will clear within 5 minutes. Overheatingintheamplifiertransformersdueto excessivepowerrequirementswilltakefrom5to 8.6.1 Excessive Power Requirements 15minutestoclear.Timingthecool-downperiod Anamplifierwilloverheatiftherequiredpowerexceedstheamplifier'scapabilities.Highdutycycles fortheamplifiermayhelptodeterminethecause oftheoverheating. and low-impedance loads are especially prone to causeoverheating.Toseeifexcesspowerrequirementsarecausingoverheating,checkthefollow- If the fault condition does not clear, return the amplifierforFactoryService. ing: 8.7 Over Current Condition 1. Theapplication'spowerrequirementsfall withinthespecificationsoftheamplifier.See theamplifier'sDatasheettoverifyoperating Theamplifiermonitorsthecurrentlevelsproduced attheamplifieroutput.TheOvertemp/OverCurrentindicatorwilllightredandtheamplifierwillbe parameters. placedinStandbymodewhenthecurrentsensors 2. Faulty output connections and load. detectoperationattheamplifier'speakcurrent 3. UndesiredDCoffsetattheOutputandInputsignal. level for more than 500 ms. An Over Current con- Iftheamplifierchronicallyoverheatswithsuitable power/loadconditions,thentheamplifiermaynot bereceivingadequateairflow.Tocheckforad- ditioncanoccurwhentheamplifierisoperatedat highlevelsintovery-low-impedanceloads(below 0.25ohms). equateairflow,proceedwiththefollowingsteps: ToremovetheamplifierfromStandbyandreturnit 8.6.2 Check for Inadequate Airflow to normal operation after an Over Current fault has 1. Checkairfilters.Overtimetheycanbecome occurred,completethefollowingsteps: dirtyandwornout.Itisagoodideatoclean theairfiltersperiodicallywithamilddetergent and water. 1. Turnoffthesignalsource. 2. Setthefront-panelStandby-Runswitchtothe Standbyposition(left). 96-8007431_06-26-2024 Information subject to change 23 9205/9305OPERATOR'SMANUALSECTION 8 3. TurnofftheACmains. 4. TurnACmainspowerbackon.IftheFaultLED doesn'tilluminateagain,presstheStandbyRunswitchtoplacetheamplifierinRunmode andturnthesignalsourceon. 5. IftheFaultLEDisstillilluminatedandtheFault conditiondoesn'tclear,returntheamplifierfor Factory Service. See the Factory Service infor- mation at the end of this section. 8.8 Factory Service Ifthetroubleshootingproceduresareunsuccessful,theamplifiermayneedtobereturnedfor FactoryService.Allunitsunderwarrantywillbe servicedfreeofcharge(customerisresponsible forone-wayshippingchargesaswellasanycustomfees,duties,and/ortaxes).Pleasereviewthe Warrantyatthebeginningofthismanualformore information. AllserviceunitsmustbegivenReturnAuthorizationbyAETechron,Inc.beforebeingreturned. ReturnAuthorizationscanberequestedonour websiteorbycontactingourCustomerService Department. Pleasetakeextracarewhenpackagingyouramplifierforrepair.Itshouldbereturnedinitsoriginal packagingorasuitablealternative.Replacement packagingmaterialscanbepurchasedforanominal fee. PleasesendallserviceunitstothefollowingaddressandbesuretoincludeyourReturnAuthorizationNumberonthebox. AE Techron, Inc. Attn: Service Department / RMA# 2507 Warren Street Elkhart, IN 46516 24 Information subject to change 96-8007431_06-26-2024