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24 Vdc:

Whenconnectingtheintercomto24Vdc,eitherthepositive(+)supplyconductormustbefusedat

thesourcewitha1/2Afuseorapower-limitedpowersourcemustbeused.

TheAD-28X-MViscapableofsendingDCpowertoanotherunitwhichismountedinaremote

locationwithoutlocalpower.24Vdcisavailablefrompins4and5oftheterminalblock.Itcanbe

run along with the signal lines to an intercom in a remote location. Only one unit should share the

power supply of another unit in any installation.

NOTE

Connectpositive(+)supplyconductortopin#4ofterminalblock.Connectnegative(-)supply

connectortopin#5ofterminalblock.

Figure7inthewiringdiagramssectionshowshowtwointercomscanbehookedupifnoremote

power is available.

SURGE PROTECTION:

MetalOxideVaristor(MOV)devicesareusedtoprotecttheaudiolinesandtheremotecontrol

line. The intercom must have Earth Ground terminated to it to ensure surge protection.

TheoutputamplieroftheAD-28X-MVoffersfullshortcircuitprotectionandoverheatprotec‑

tion.

MODEL AD-28X-MV SPECIFICATIONS

OperatingVoltage 24Vdc,120Vacand240Vac50/60Hz

CurrentDraw Voltage Operating Standby

 24Vdc 260mA 62mA

 120Vac 163mA 70mA

 240Vac 82mA 35mA

AmplierSpecications

 FrequencyResponse(-6dB) 150Hzto12kHz

Input Impedance 3400 ohms

 Max.OutputVoltage

Sine Wave:

 UnbalancedOutput 7.5Vrms

 SquareWave:

 UnbalancedOutput 9.5Vrms

SpeakerRating 30watts

SpeakerImpedance 16ohms

TemperatureRangeforOrdinaryLocations –31°Fto+150°F(–35°Cto+66°C)

TemperatureRangeforHazardousLocations +41°Fto+149°F(+5°Cto+65°C)

FuseTypeGMC-1/2 1/2A,250V

CallButtonActuatedDryContactRating 500mAat125Vac

 1.25A@24Vdc

Weight

 Shipping 10lb,11oz

 Net 9lb,4oz

HousingDimensions 6.5”(16.5cm)Wx9.88"(25.1cm)Hx

  3.88"(9.9cm)D

ConduitEntrances Dual1/2"‑14 IPS

HousingMaterial Aluminum

Color Gray

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Atkinson Dynamics AD-27 Specifiche Pagina 5

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