Rauland Telecenter Iv - Sw25 And Swl25 Room Selector Panels 电路图.pdf

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1、RAULAND-BORG CORPORATION ? 3450 West Oakton Street, Skokie, Illinois 60076-2951 ? (708) 679-0900 PRELIMINARY DESCRIPTION The SW25 and SWL25 panels are used with all Direc- tor Series sound and communications systems. These panels let you selectively connect up to 25 rooms to either the program or th

2、e intercom channel. There is also a center OFF position. Color-coded directions identify each channel: green for program, and orange for intercom. The SW25 offers room selection only (no call-in signal). The SWL25 also provides a call-in signal. When a call is made from a switch in the classroom, an

3、 LED lights next to the corresponding number on the panel and a tone alerts the console operator to the call. The LED lamp remains lit until the operator answers the call, at which time the lamp automatically shuts off. INSTALLATION CABLING REQUIREMENTS RECOMMENDED TERMINATIONS Systems using the SW2

4、5 (no call-in signal) require one twisted pair in a shield for each speaker station. Systems using the SWL25 (call-in signal) require one additional conductor within the shielded cable for each speaker station. Use #22-AWG solid or stranded conductors with 22-AWG drain wire. If youre using insulatio

5、n-piercing connectors, the outside diameter of any wire, including its insulation, must not exceed 0.095”. Insulation-piercing connectors are the fastest, most reliable way to terminate wire to the switchbank. These connectors must be ordered separately. Order one SK- 2522 Connector Kit for each swi

6、tchbank. The kit contains 25 four-terminal connectors for 22-AWG wire. The at- tached manual, KI-1564, tells how to install these connec- tors. ALTERNATIVE METHOD #l CABLE ROUTING AND STRAIN RELIEF Route the cables as shown in the diagram. Secure them with three plastic cable ties through the guide

7、loops in the rear bracket. Leave service loops in the cables used to interconnect the equipment panels and at least a one-inch slack in each cable. This permits reconnection when re- quired. Modified wire wrapping may be used to terminate 22- or 24-AWG solid conductors. Strip back wire about 1%” and

8、 use a wire-wrapping tool that provides one complete turn of insulation around the terminal pm. This modified wire wrap provides the required strain relief. ALTERNATIVE METHOD #2 Connect the twisted pair to terminals D and E, and the drain wire to terminal G for each line circuit. On Model SWL25 onl

9、y, connect the third conductor for call-in to terminal T (Trigger). CONNECTOR OR BUS WIRING There are three terminals (OFF, A, C) at the ends of the switchbank that will be interconnected in a factory-wired system. These interconnections provide loop-through for common functions, especially between

10、multiple switchbanks. For wiring details, read the instruction man- ual for the proper program and intercom equipment panel. When youre wiring to these end terminals, you may need to cut slots in the connector shells for loop- throughs between switchbanks. Crimped connectors may be used where there

11、is a mixture of wire gauges (18-24 AWG) in the system, or where preferred. Multiple-gauge crimped connectors and an adapter shell are required for this termination method. Order one CTA25 Terminal Adapter Kit for each switchbank in the system. The kit contains 25 four-termi- nal adapter housings and

12、 100 crimp connectors. Hand Tool G2501 (or the older G317A) is required to crimp the connectors onto the wires. Strip away about 1%” of the cable sheathing and shield, then strip the individual wires about l/8”. Crimp each terminal onto a wire using Molex Model HTR-2445-A (Molex Part No. 11-01-0026)

13、; a reliable connection can- not be made using another tool. Insert each crimped terminal into an adapter housing. 1988 RAULAND-BORG CORPORATION ? Printed in U.S.A. Orig. 10/87 Rev. 4/88 Page 1 of 4 RadioFans.CN 收音机爱 好者资料库 3 CABLE TIES ATTACHED TO GUIDE LOOPS.f25 SHIELDED CABLES TO REMOTE STATIONS.

14、Cable InstalIation (from KM0520A) SPECIAL APPLICATIONS It is possible to modify the panels OFF and C buses for special applications. For example, you can isolate the OFF lines to prevent the distribution of the ALL-CALL function to the isolated remote speaker lines. To access the buses: Carefully re

15、move the front dress panel by removing its two finish screws and pulling it off. Then remove the eight small Phillips screws on the front of the sub-panel and and the two hex-head sheet-metal screws holding it to the rear of the chassis, and pull it off (you will have to spread its sides a bit to cl

16、ear the PC board). Carefully spread the two main PC boards apart (they are joined at one edge by multiple wires). The OFF bus is a small PC board that is perpendicular to the board with the selector switches. Note that each switch is connected to a trace on either side of this bus board. Cut the tra

17、ces as needed, and make any connec- tions to the solder pads on the bus board. The C bus conductors can be easily cut with a sharp knife to isolate the C lines for multiple-master operation. Use the low-numbered switches (1, 2, 3, etc.) for master stations. Make a l/32” cut through the top and botto

18、m cir- cuit board conductors where the split is needed. Make the C bus connections for low-numbered switches by solder- ing a pair of wires to the two pads provided at the upper left corner of the circuit board (as viewed from the front). Make the C bus connections for the other side of the split to

19、 the regular C terminal pins. To operate with multiple- channel remote stations, you must split the C bus and completely cut both sides of the OFF bus. PRE-1987 SWL25 UNITS: If you change a silicon-controlled rectifier (Rauland Part No.ETS008), make sure that the associated R2 is 330 ohms. INTERCONNECTIONS There are certain restrictions and specific interconnec- tions to be made, depending upon the associateda modules used in the system. For more details, read the in- structions provided with that equipment. RadioFans.CN 收音机爱 好者资料库