INSTALLATION AND SERVICE INSTRUCTIONSMODEL AD-28LD-MVCALLWARNING: DISCONNECT POWER BEFORE REMOVING COVERTALKLISTEN290A3077B2562445AREV. A 1108Printe

Figure 4.-10-  Atthistimeabriefexplanationoftheservicerequestedorthenature of the malfunction, should be given.  Addressallcommunica

-11-Figure 5.290A3080B24 VDCGROUNDREMOTEAUDIO +AUDIO -DRY CONTACTDRY CONTACT24 VDCGROUNDREMOTEAUDIO +AUDIO -DRY CONTACTDRY CONTACTNEUTRALHOTEARTH GND.

-12-Using Call Dry Contacts with AC The dry contacts can be used to switch devices such as an auxiliary sound or light when call is depressed. The m

-13-Basic Balanced Line System This is a simple system with only two conductors connected between the units.ACpowerisutilizedatbothsites.The

-14-Basic Unbalanced Line System Thiscongurationisusedwhenhookingtootherproductsonthemarket. This system does not offer the same level o

Multiple Intercoms Multipleintercomscanbetiedtooneline.Depressingtalkonanyunit willbroadcastaudiooverallotherunits.(NOTE:onlyo

-2-INSTALLATION AND SERVICE INSTRUCTIONSFORMODEL AD-28LD-MVSAFETY MESSAGE TO INSTALLERS, USERS AND MAINTENANCE PERSONNEL It is important to follow al

Figure 1.-3-A. GENERAL FEATURES. TheAD-28LD-MVintercomisa2-waycommunicationsdevicedesigned for light duty industrial applications. Nominal o

-4-Figure 2.mastermode.WhentheswitchisreleaseditwilldefaultbacktotheListenorSpeakermode,allowingtheusertoreceiveanymessagestra

-5-REMOTECONTROL: Remotecontrolisusedtochangetheoperationmodeofaremoteintercomfromlistentotalkorfromtalktolistenuponactivatio

-6-Figure 3.ISOLATEDBALANCED/UNBALANCEDLINES: The audio signals are transmitted over a wire pair using balanced line technology. This means each wi

-7-multiple intercom interconnections.MODELAD-28LD-MVSPECIFICATIONSOperatingVoltage24Vdc,120Vacand240Vac50/60HzCurrentDraw Voltage Oper

-8-B. UNPACKING. AfterunpackingtheModelAD-28LD-MV,examineitfordamagethat may have occurred in transit. If the equipment has been dam-aged,

-9-three-positionterminalblock(J2)intheClassIwiringcompartment.The signal lines, remote control lines, remote power, and call dry con-tacts