Page 1 of12 DocNo.DCP0001326 DSM 06/01/05 rev7
Features
The P2.200 LSamplifiercontainstwoidentical independent amplifiermodules.Eachhasone Mainand one
Aux.input. Routing logicallowsthe Mainand Aux.to mix;thisallowsthe monitoring tone to pass at all times
and the monitoring systemto operate. Ifthe PTT isoperated, the Main input overridesthe Aux.
Eachmodule’sstatusisdisplayed on the front panelalong with an output levelbargraph and status
indicators. All sectionsofthe amplifierand chargerare constantlymonitored forfaultsorabnormaloperation:
1 The load monitoring checksthe powerabsorbed bythe loudspeakerload at 22 kHzand comparesthis
with the thresholdand windowlevelsset at installation. Ifthe powerdrawndeviatesoutside the windowa
faultisindicated on the front and rearofthe unitand signalled to otherequipment viathe relevant fault
outputs.
2 Ifthe impedancemonitoring tone isnot being received bythe amplifier,both the Load Hiand Load Low
front LEDslight and the rearTone Fail light shows.
3Shouldeitherleg ofthe loudspeakerwiring shortto systemearth thiswill alsolight the Load Hiand Load
LowLEDson the front panel, along with the Earth Fault LED on the rear.
4Mainspowerstatusisalso monitored, along with the internalfuses, to give a complete picture ofthe state
ofthe amplifier.
The load monitoring systemalsoprovidesan output to drivea‘hot swap’automaticamplifierreplacement
system,viathe HSP port, on failureofthe amplifieronly.Shouldaload fail shortoropen circuitbut the
amplifierisstill OK,the hot swap output will not operate. Thismeansthat anyloudspeakers that can be
driven will operate and leavesthe hot swap amplifieravailable foruse on anotherpotentialfailure.
The output fromeachmoduleispresented on athree-waysocket and isfullyfloating. The standardoutput
voltagesare 50Vand 100V, allowing two modulesto be connected in seriesto give 400Wat 100Vline.
The powersupplyhasa 24 Vd.c. batteryinput and an onboard batterycharger.
Technical Description
AmplifierModules
The Aux.and Mainline levelinputsarede-balanced and pass vialevelcontrollers and an analogue switch
into asumming amplifierwheretheyaremixed. Ifthe contactinput isasserted (470 ohmsto ground)alogic
circuit disconnectsthe aux. input.
The protectcircuitdisconnectsthe output transformerwhen the voltage railsfall below22 Volts,exceed 36
Volts,orwhen ad.c.offset ispresent on the output rails.The signalthen passesthrough to the output stage,
which isa feed-forward current-mode bridge circuit and the output levelmetermonitors the levelat thisstage.
The output current ispassed through the primaryofthe output transformerand through alowvalue output-
sensing resistor.The output ofthe transformeristapped at 50 and 100 Volts.Ifthe 50 Volttapsare
connected in seriesthe unit providesa single 400 Watt output at 100 Vline.
PowerSupply
Alarge capacitorreservoirprovidesaverysmooth output, even underlarge current surges.Twoseparate
internal10 Amp fused outputsconnect to the two amplifiermodules.
Aseparate low-current feed passesviathe sleep enableselectorlinkinto the sleep timersection. Another
feed passes,viathe Aux.on LED(thisshowsthat the Aux.powerisavailableon the rearconnector) through
a3Ampfuseto the Aux.powerconnector.With mainsvoltage operation thisunregulated output isat
approximately32 Vd.c.When mainshasfailed, thisoutput isconnected to the batteryand thereforeoperates
at batteryvoltage level.
A27.6 Volt regulatorisalso taken off thisline and used to charge externalbatteriesvia a 20 Amp fuse.
PSUand amplifierfaultsarereturned into the monitoring circuitfromboth amplifiers,slugged to prevent false
faultsbeing reported externally,and passed to the open collectorfaultoutputson the SIPport. Afourth open
collectoroutput isnormallyset asOK(normallyclosed)and openswhen anyfault occurs.
Operation Instruction Manual
