powersoft DIGAM K series - Protection; Turn-On;Turn-Off Muting; Short Circuit Protection; Thermal Protection System

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PRELIMINARY
3Protection
3.1Turn-On/Turn-Offmuting
Foraboutfoursecondsafterturn-on,andimmediatelyatturn-off,theamplifieroutputsaremuted.
3.2Shortcircuitprotection
A shortcircuitprotectionsystemsafeguardstheamplifier'soutputtransistorsundershortcircuitsandotherstressfulloads.
Itiscompletelyinaudiblewheninactive.Incaseofshortcircuit,theredLEDwillbelight-upandwriting"PROT"appearsin
thefirstlineofthedisplay(seePar.2.2foradetaileddescription). Theamplifierwillresethimself50timesevery2seconds.
Once50resetshavebeenperformedandthefaultstillexisstontheoutput,theunitsetsintosteadyprotectionmode. Turn
ON/OFFcycleisneededtorestarttheunit.
3.3Thermalprotection
A DIGAMamplifierusesacontinuouslyvariablespeedfantoassistcooling(thefanspeedchangesinresponsetothe
amplifier'scoolingneeds).Iftheheatsinktemperaturereachesapproximately80°C,theyellowLEDstartstoflashing.Ifthe
temperatureismorethen85°Cthethermalsensingcircuitrywillmuteeachpowersectionchannels,theLEDwilllight
permanentlyandthepowersupplywillbecutoff.Oncetheheatsinkhascooleddown,theamplifierwillautomaticallyreset
andtheLEDwillbegoout.Itispossibletoreducethetemperaturebyreducingtheoutputpower.
3.4DCfaultprotection
IfDCorexcessivesubsonicenergyappearsatachanneloutput,aninstantaneousprotectioncircuitwillcutoffthepower
supplyforbothchannels.Powersupplyshutdownisusedinsteadofspeakerrelays,therebyimprovingthedampingfactor
andreliabilityoftheDIGAMamplifiers.
3.4Input/Outputprotection
AnultrasonicnetworkdecouplesRFfromtheoutputsandkeepstheamplifierstablewithreactiveloads.
4Usermaintenance
4.1Cleaning
Disconnecttheamplifierfromthe ACmainsourcefirst;useasoftclothandmildnon-abrasivesolutiontocleanthe
faceplateandchassis.
4.2Service
Therearenouser-serviceablepartsinyourDIGAMamplifier.Referservicingtoqualifiedtechnicalpersonnel.
Inadditiontohavinganin-houseservicedepartment,Powersoftsupportsanetworkofauthorizedservicecenters.Ifyour
DIGAMamplifierneedsrepair,contactyourPowersoftdealerordistributor,orcontactthePowersoft TechnicalService
department,toobtainthelocationofthenearestauthorizedservicecenter.
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