MODEL AD-28LD-MV CALL LISTEN UNIVERSITY PARK, IL USA TALK WARNING: DISCONNECT POWER BEFORE REMOVING COVER INSTALLATION AND SERVICE INSTRUCTIONS 2562445A REV. A 1108 Printed in U.S.A.
INSTALLATION AND SERVICE INSTRUCTIONS FOR MODEL AD-28LD-MV SAFETY MESSAGE TO INSTALLERS, USERS AND MAINTENANCE PERSONNEL It is important to follow all instructions shipped with this product. This device is to be installed by a trained electrician who is thoroughly familiar with the National Electrical Code and will follow NEC Guidelines as well as local codes.
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, transformer isolated audio inputs and internally selectable Master or Slave mode configurations.
CALL LISTEN UNIVERSITY PARK, IL USA TALK WARNING: DISCONNECT POWER BEFORE REMOVING COVER 290A3077B 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 transmitted back to it. The output amplifier offers full short circuit protection and over heat protection. SLAVE MODE: Some applications may require that the intercom constantly transmit (i.e., act as a microphone) as opposed to constantly receive (i.e.
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 activation of a local intercom. The wiring diagram section illustrates Master/Slave Installation and Using Foot Switches Diagrams. (See figures 5 and 6.) Normally open foot switches can also be connected to the Remote Control line and ground in order to allow “hands free” operation of the listen/talk functions.
J7 24VDC IN/OUT GROUND REMOTE CONTROL + J2 REMOTE SPEAKER COMMON PHASE - EXT CALL CONTACT GROUND CLASS I WIRING CLASS II WIRING 290A3078 Figure 3. ISOLATED BALANCED/UNBALANCED LINES: The audio signals are transmitted over a wire pair using balanced line technology. This means each wire carries a signal that is opposite in polarity of the other. At the input of the intercom is an isolated balanced line transformer.
multiple intercom interconnections. MODEL AD-28LD-MV SPECIFICATIONS Operating Voltage 24 Vdc, 120Vac and 240 Vac 50/60 Hz Current Draw Voltage 24 Vdc 120 Vac 240Vac Operating 120 mA 80 mA 40 mA Standby 60 mA 60 mA 30 mA CAUTION: The 24Vdc input must be limited to 760 mA out if run from a supply. Amplifier Specifications Frequency Response (–6 dB) 150 Hz to 12 kHz Input Impedance 3400 ohms Max. Output Voltage Sine Wave: Balanced Output 15 Vrms Unbalanced Output 7.
B. UNPACKING. After unpacking the Model AD-28LD-MV, examine it for damage that may have occurred in transit. If the equipment has been damaged, do not attempt to install or operate it, file a claim immediately with the carrier stating the extent of the damage. Carefully check all envelopes, shipping labels and tags before removing or destroying them. Before attempting to install the intercom, be sure that all parts listed in the KIT CONTENTS LIST have been supplied. C. KIT CONTENTS LIST. Qty.
three-position terminal block (J2) in the Class I wiring compartment. The signal lines, remote control lines, remote power, and call dry contacts are landed in a seven-position terminal block (J7) in the Class II wiring compartment. The two wiring sections are isolated by a fishpaper barrier. WARNING Disconnect power to the intercom before any installation, maintenance, or configuration changes are performed.
8.00 7.125 CALL LISTEN UNIVERSITY PARK, IL USA TALK WARNING: DISCONNECT POWER BEFORE REMOVING COVER CLASS I WIRE ENTRY BACK FRONT 3.50 5.50 4 x .202 COMBINATION 1/2"-3/4" KNOCK-OUT 3.05 CLASS II WIRE ENTRY 1.40 BOTTOM 6.87 290A3079B Figure 4. At this time a brief explanation of the service requested or the nature of the malfunction, should be given. Address all communications and shipments to: Service Dept. Atkinson Dynamics Federal Signal Corp. 2645 Federal Signal Dr.
G. WIRING DIAGRAMS. INTERCOM I AD-28LD-MV MASTER MASTER/SLAVE INSTALLATION INTERCOM II AD-28LD-MV SLAVE J7 J7 24 VDC 7 7 24 VDC GROUND 6 6 GROUND REMOTE 5 5 REMOTE AUDIO + 4 4 AUDIO + AUDIO - 3 3 AUDIO - DRY CONTACT 2 2 DRY CONTACT DRY CONTACT 1 1 DRY CONTACT 3 NEUTRAL 2 HOT 1 EARTH GND. 1K 1 WATT J2 NEUTRAL 3 HOT 2 EARTH GND. 1 J2 AC AC 290A3080B Master Slave Installation In this installation, the Master is constantly broadcasting audio from the Slave.
INTERCOM I AD-28LD-MV MASTER 24 VDC 7 GROUND 6 REMOTE J7 USING CALL DRY CONTACTS WITH AC INTERCOM II AD-28LD-MV SLAVE J7 1K 1 WATT 7 24 VDC 6 GROUND 5 5 REMOTE AUDIO + 4 4 AUDIO + AUDIO - 3 3 AUDIO - DRY CONTACT 2 2 DRY CONTACT DRY CONTACT 1 1 DRY CONTACT POWER J2 NEUTRAL 3 HOT 2 EARTH GND. 1 POWER AC AC J2 3 NEUTRAL 2 HOT 1 EARTH GND.
INTERCOM I AD-28LD-MV MASTER BASIC BALANCED LINE SYSTEM INTERCOM II AD-28LD-MV SLAVE J7 J7 24 VDC 7 7 24 VDC GROUND 6 6 GROUND REMOTE 5 5 REMOTE AUDIO + 4 4 AUDIO + AUDIO - 3 3 AUDIO - DRY CONTACT 2 2 DRY CONTACT DRY CONTACT 1 1 DRY CONTACT 3 NEUTRAL 2 HOT 1 EARTH GND. 1K 1 WATT J2 NEUTRAL 3 HOT 2 EARTH GND. 1 J2 AC AC 290A3084B Basic Balanced Line System This is a simple system with only two conductors connected between the units.
INTERCOM I AD-28LD-MV MASTER 24 VDC 7 GROUND 6 REMOTE 5 AUDIO + 4 AUDIO - 3 DRY CONTACT 2 DRY CONTACT 1 BASIC UNBALANCED LINE SYSTEM J7 AC 1K 1 WATT AUDIO CABLE GROUND J2 NEUTRAL 3 HOT 2 EARTH GND. 1 AC 290A3086B Basic Unbalanced Line System This configuration is used when hooking to other products on the market. This system does not offer the same level of noise isolation as a balanced line system and should only be used when hooking to existing devices.
INTERCOM I AD-28LD-MV MASTER 24 VDC 7 GROUND 6 REMOTE 5 AUDIO + MULTIPLE INTERCOMS INTERCOM 2 AD-28LD-MV SLAVE J7 J7 7 24 VDC 6 GROUND 5 REMOTE 4 4 AUDIO + AUDIO - 3 3 AUDIO - DRY CONTACT 2 2 DRY CONTACT DRY CONTACT 1 1 DRY CONTACT NEUTRAL 3 3 NEUTRAL HOT 2 2 HOT EARTH GND. 1 1 EARTH GND.
