Power Intercom Systems Models PI35A & SI35A Installation & Operation Guide
© 1997 Bogen Communications, Inc. 50 Spring St., Ramsey, NJ 07446 All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Bogen Communications, Inc. Notice: The information contained in this document is subject to change without notice and should not be construed as a commitment by Bogen Communications, Inc. Bogen Communications, Inc.
Contents Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Wiring & Grounding Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Auxiliary Power Receptacle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Maintenance & Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking Your Bogen equipment was carefully checked before leaving the factory; inspect the shipping container and unit closely for improper handling. If the unit has been damaged, make an immediate claim to the distributor from whom it was purchased. If the unit was shipped directly to you, save all shipping materials and notify the carrier immediately and place a claim.
Introduction Description Bogen Models PI35A and SI35A are 25-station intercom systems (SI35A is expandable to 75 stations). They can provide facilities with two-way communication, emergency paging, time tones and background music or other audio program material to speaker-equipped locations. Both systems consist of a master control panel (Bogen model MCP35A) and a 25-station room selector panel (Bogen model SBA225) assembled into an attractive wood grain cabinet.
MCP35A Control Panel Front Panel 1 9 RELEASE 2 3 4 5 6 7 8 1. CONSOLE MIC - Used as microphone 1 or in conjunction with the emergency page or press-to-talk/releaseto-listen (intercom) push-buttons. This mic is always used for two-way intercom calls, using the green button, and emergency paging using the red button. No external mic can replace the console mic for these functions. 2. EMERGENCY PAGE — Red push-button — Used to make announcements to all speaker stations.
MCP35A Control Panel Rear View 9 10 8 7 6 5 4 11 3 2 12 1 13 1. MIC 1 — Connections for an external mic (MIC 1). When the PROGRAM DISTRIBUTION button MIC 1 is pressed, the microphone connected here becomes active. As shipped from the factory, a link is installed between the HI and CONS MIC terminals. This makes the CONSOLE MIC act as MIC 1.
SBA225 Speaker Selector Panel Front View 1 3 2 1. Room selector switch — Position of the room switch controls the type of audio program material delivered to the room speaker. 2. Call annunciators — Lights to indicate a room has placed an intercom request from a call switch 3. Program busses — A room speaker can be turned off or connected to one of two audio busses. The program A bus allows continuous audio to play into the room from an audio source selected on the MCP35A control panel.
Basic System Operation Communicating With a Selected Speaker Use the following steps to talk and listen to a room that has its switch set to the “C” (down) position. 1. 2. 3. 4. Place the switch of the room that you wish to talk and listen to in the “C” (down) position. Make sure the PROGRAM DISTRIBUTION button MIC 1 is in the out position; if not, push it to pop it out. Press and hold the green PRESS-TO-TALK switch and speak into the CONSOLE MIC (upper left corner).
Basic System Hook-Up 4-Wire Speaker Connections to the SBA225 4-wire speaker connections (3-conductor + shield) is recommended for all new installations. The figure below shows the connection to the back of the SBA225 when using a 4-wire system. Note: You must use Bogen connectors for this connection. There are different connectors available for different wire gauges. Refer to the list below to determine the correct connector model number. Connector Kit Numbers: Use Bogen Connector Kit Model No.
Call-In Switches Two call-in switches, CA10A and CA11A, are recommended for use with the SI and PI. The CA10A is a momentary push switch that has circuitry to light the annunciator light on the SBA225 room selector panel. The CA11A has the same capability as the CA10A and includes a privacy lock-out position that inhibits the MCP35A control panel from listening through the room speaker (it does not interfere with the ability to call the station from the MCP35A).
Speakers and Speaker Wiring The MCP35A control panel of the SI and PI products is designed to use 25-volt distributed speakers. These speakers have line-matching transformers with various power level taps. 8-ohm speakers or speakers without line-matching transformers cannot be used with the SI and PI products. Distributed speakers can be tapped at various power levels and this is determined by which wire from the speaker’s transformer is used for connection.
Advanced Hook-Ups External Emergency Mic It is possible to use a microphone (Model MBS1000) with a contact closure to make an emergency announcement. The TELCO terminal on the back of the MCP35A control panel can be used to remotely trigger an emergency page on the system. Whenever the TELCO terminal is shorted to the GND terminal the MIC 2 input will become active and send audio to all rooms regardless of switch settings. The figure below shows the required wiring.
The Bogen model TAMB telephone interface module can be used to make a remote page through the telephone system. Note: Jumper J3 on the MCP35A printed circuit board must be set to the TELCO position. See the Special Adjustments section for jumper information. A Bogen TP-AP Series Interphone can be used to make a remote page. The figure below shows the connection. Note: Jumper J3 on the MCP35A printed circuit board must be set to the TELCO position.
External Booster Amp An external booster amplifier (Bogen Model BPA60) can be connected when the application requires more than 35 watts. Using an external amplifier disconnects the internal 35W amp of the MCP35A. To install, connect a RCA cable from the MCP35A LINE OUT jack to the Hi-Z input jack on the rear panel of the BPA60 amplifier. Connect another cable from the 25V output terminals of the booster amplifier to a 1/4” stereo phono plug wired as shown in the figure below.
TWK351 Wire Converter The model TWK351 is an adapter used in instances where there is existing 3-wire (2-conductor + shield) room wiring. The TWK351 cannot be used with the SCR25A module. If 3-wire operation using the TWK351 wire converter is desired, CA10A call switches must be used (CA11A Call-In switches will not work in this application).
SCR25A Call-In Module The SCR25A module can be added to allow the annunciator indicators to light from a simple SPST call-in switch (Bogen model CA17). All call-in switches must go back to the SI or PI on separate lines. It will not allow annunciator illumination from parallel connected call-in switches described in the Voice call-in section. The SBA225 module simply pushes onto the connectors on the back of the SBA225. The figure below illustrates the connections to the rear of the SCR25A module.
SI35A Model Option Enhancements The SI35A has provisions to add up to 2 additional SBA225 switchbanks. Simply remove the blank panels and replace with a switchbank. Make connections as shown in the diagram below. An auxiliary music source, such as the Bogen CR100A Radio/Cassette Player or TP30D Tuner can also be added to the SI35A. Install the component in the appropriate rack panel and make audio connections to the MCP35A AUX input.
Special Adjustments Emergency Page Volume Gain Adjustments Screwdriver-adjustable INPUT GAIN controls are located on the rear panel for MIC 1, MIC 2, AUX, TEL PAGE, TALK and LISTEN. Set the controls so that signal clipping cannot occur. Proceed as follows: 1. Apply input(s) to the desired channel(s). 2. Set the corresponding front panel control(s) to maximum. 3.
Internal Jumper Selections Internal jumpers are provided for phantom power (Mic1/Mic2), Telco Page/Mic 2 input selection, monitor speaker muting, and privacy tone defeat. Warning High voltages are present within the MCP35A. The unit should not be operated without covers in place. To change jumpers, unplug the MCP35A and remove it from the enclosure. Remove the top cover and place the jumper in the desired position. Replace the top cover and plug the unit back in.
Troubleshooting Guide MCP35A Troubleshooting Procedure If a problem exists on the MCP35A, certain steps should be taken to find the problem. This test relates to the Program Amplifier (All-Call or Emergency). The first indication of a problem will appear on the three level indicators at the front of the unit. They are green, yellow, and red. If there is no problem, the green, yellow and/or the red LED should flicker whenever audio is present, depending on the signal strength.
System Specifications Rated Output: Program — 35W RMS Intercom — 20W RMS Frequency Response: Program — +1,-3dB from 80Hz to 15kHz Intercom — Shaped for maximum intelligibility Distortion: Less than 1% at rated power and bandwidth Inputs: Two Lo-Z balanced MIC inputs; Hi-Z unbalanced AUX input; Telco Page; 25V Booster input Output: 25V Balanced line; Line Out to booster Input Sensitivity (for rated output): Program — Mic Input: 300mV balanced Lo-Z; AUX: 100mV unbalanced Hi-Z; Telco Page: 100mV unbalanced Hi-
50 Spring Street, Ramsey, NJ 07446, U.S.A. Tel: 201-934-8500 Fax: 201-934-9832 web: www.bogen.
