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Figure 1.

-3-

A. GENERAL FEATURES.

 TheAD-28LD-MVintercomisa2-waycommunicationsdevice

designed for light duty industrial applications. Nominal operating

voltagesinclude120/240Vac,50/60Hzand24Vdc.Voltagechanges

forthe120/240VACareinternallyswitchselectableandtheACline

isfusedwitha1/2amp250volttypeGMCfuse.Theunitalsooffers

internally selectable balanced or unbalanced line operation, trans-

formerisolatedaudioinputsandinternallyselectableMasterorSlave

modecongurations.Acallbuttonwithremotecalldrycontactsis

alsofactorysuppliedintheunit.TheAD-28LD-MVhasaType1en-

closureandisaULListedsignalappliance.

MASTERMODE:

 EachintercomcanbeconguredasaMasterunit(Push-to-Talk)

oraSlaveunit(Push-to-Listen)bychangingtheMAS/SLAjumper

(J3)ontheprintedcircuitboard(seegure1).Theintercomcomes

fromthefactorysetintheMaster(MAS)mode.

 IntheMastermodetheintercomactsasanamplier,constantly

broadcastingoveritsspeakeranysignalthatitreceivesonthesignal

lines.HoldingdowntheListen/Talkswitchchangestheunitfroma

speakertoamicrophone(seegure2).Theintercomwillnowtrans-

mitoverthesignallinestoadditionalintercom(s)alsosetinthe

C11

REPLACE

TYPE

240VAC

ONLY

SAME

SW1

FUSE

WITH

GMC-1/2

1/2A

CR1

120VAC

CR2

R18

24VDC

CALL

IN/OUT

CONTROL

GROUND

CONTACT

SPEAKER

2001290 A

R19

EXT

REMOTE

IC3

C21

CR7

CR6

CR5

CR4

C13

>BAL

>UNB

R17

R16

CR3

R15

C14

>MAS

>SLA

R12

R13

R14

R11

R10

C10

C20

C19

C18

C17

R34

C22

CR8

R33

R31

R32

R30

R29

R28

R27

R26

R25

R21

R22

R24

R23

IC1

C12

C16

IC2

C15

R20

250V

TO SPEAKER

FUSE

CLASS I WIRING

120VAC/240VAC

SWITCH

TO SWITCH

MASTER/SLAVE

JUMPER

VOLUME

CONTROL

CLASS II WIRING

BAL/UNBAL

JUMPER(2)

290A3076

1 2 3 4 5 6 7 8 ... 14 15

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