Rauland Fax250 Power Amplifier 电路图.pdf

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1、_ KI-13836 FAX250 250-Watt Power Amplifier Installation and Service Instructions RAULAND-BORG CORPORATION ? 3450 West Oakton Street, Skokie, Illinois 60076-2951 ? (847) 679-0900 Dress-Panel Mounting Screw (4) Pilot LED (Front View) Figure 1. Model FAX250 Amplifier with its Dress Panel Mounted 1993 R

2、AULAND-BORG CORPORATION ? Printed in U.S.A. Page1 of 12 Orig. 4/84. Rev. 12/86, 9/87, 10/87, 9/88, 3/89, 7/92,9/93. 1 38307 RadioFans.CN 收音机爱 好者资料库 FAX250 250-Watt Power Amplifier Description The Rauland FAX250 Amplifier is designed for continu- ous operation in safety, paging, and professional soun

3、d systems. Its rugged construction has enabled it to pass the rigorous testing of Underwriters Laboratories for UL-1711 fire-protective signaiing systems. The FAX250 delivers 250 watts of power when operated from 120 VAC. It also has connections that enable it to function from 24-VDC batteries durin

4、g a power failure. Its ruggedness, versatility, and wide frequency response make the FAX250 well-suited to institutional and commercial alarm, paging, and sound-reinforcement systems. Unpacking The factory thoroughly checked this amplifier. Inspect it, the enclosed pans, and the container for signs

5、of improper handling during shipment. In case of damage, place a claim at once: with the dealer or distributor from whom you purchased the unit or-if it was shipped directly to you-with the carrier. The following parts are included with the amplifier: Qty. 8 8 8 8 Rauland Description Part No. Rack-M

6、ounting Screws for tapped holes ( # 10-32 WA1 52 x slotted pan-head machine). Rack-Mounting screws for untapped holes (#10 WA25 x hex washer-head thread-formrng). #10 “U” type Speed Nuts for untapped rack- AB1 889 mounting holes. # 10 External-tooth Lock Washers for rack-mount- WJO 105 ing. Front Pa

7、nel. AN0963 Panel-Mounting Screws (X6-32 x VB” black pan-WA1 37 head Phillips machine). #6 “U” type Speed Nuts, for mounting the front AB 1268 panel. #6 flat stainless-steel panel-mounting washers. WJO074 LED Cartridge. JLO079 Installation I -Pb.m+:-m.n muall /_ the flat sides the amplifier to conti

8、nue operating during an AC power of the “U” nuts should face outwards. failure. All of the installation steps are given below. How- Page 2 9/93 RadioFans.CN 收音机爱 好者资料库 FAX250 250-Watt Power Amplifier RP2 RP1 Cable for LED Pilot bight Dress Panel Figure 2. FAX250 Amplifier with its Front Panel Remove

9、d. 9/93 Page 3 FAX250 250-Watt Power Amplifier NOTES: 1. THE RATING OF DIODE D1 MUST BE AT LEAST 20 AMPERES. 2. THE CONTACTS OF RELAY K1 ARE SHOWN IN THE DE-ENERGIZED POSITION. ” PUSH-ON TERMINAL + 1 USETHE SAME CIRCUIT THAT SUPPLIES AC LINE POWER TO THE AMPLIFIER. c ” PUSH-ON TERMINAL CAUTION: CONN

10、ECT THE AC POWER BEFORE CONNECTING THE BATTERY CABLES. CONNECTING A BACKUP BATTERY TO THE FAX250 KMO800 ever, only the internal connections need to be completed before the audio connections are made. Step 1. Make sure that no power-neither batteries nor AC-is connected to the amplifier. Then remove

11、the three top screws from the rear top of the unit (see Figure 3) and gently open and lower the hinged rear panel (its heavy). Step 2. Bring in the DC power cable (at least 14-gauge- check the local codes) through the conduit knockout hole in the rear panel (marked External DC Access, near the AC po

12、wer cord-see Figure 3). Step 3. Attach -inch push-on terminals to the cable ends and connect them to the mating h-inch “+” and “-” spade terminals on the upper right section of the amplifier, near Capacitor C514 (see Figure 4). Important: The External DC Access terminals are for a battery: this ampl

13、ifier does not supply any DC power for auxiliary equipment. Important: The DC input terminals must be wired with the correct polarity to prevent personnel danger, battery damage, and amplifier damage. Step 4. Carefully swing the rear panel shut and resecure it with the three screws you removed in St

14、ep 1. You may now either install the external components of the battery back-up or go on to the audio connections. Step 5. Refer to KMO800, above, to complete the battery back-up installation. Input Connections An input of 0.3 volts is needed to drive the FAX250 to its rated power output. Either bal

15、anced or unbalanced inputs may be used. In either case, keep the input leads away from the output leads and the AC power cables. If the signal souce ha a hiuh nlltnllr imnAanre ken t h e b_- _-_ _-s_g h impedance _= - signal leads shorter than ten feet. See Figure 3 for the location of the input ter

16、minals. Balanced Input: Connect the audio source to the Bal. Input terminals with a twisted-pair, low-capacity shielded cable. This input configuration requires the installation of a piug-in transformer in chassis socket T1 (S501-see Figure 3). Use the Rauland RlOO6 Balancing Transformer for a balan

17、ced input, or the Rauland R1008 Bridging Transformer for a balanced bridging input. Each trans- former has a 1:1 turns ratio and comes with a mounting bracket and screw. Hi-Z Unbalanced Input: Use the Hi-Z input connectors for a high-impedance (50,000-ohm) unbalanced input. Use a single-conductor, l

18、ow-capacity shielded wire for the input connection. Grounding: In a sound-reinforcement or reproduction system, it is necessary that the audio common be connected to the equipment chassis ground at some point. For best results, only one such connection should be made in the entire system. Generaiiy,

19、 the best place for this ground connection is on the preamplifier chassis; all Rauland preamplifiers are supplied with this connection. Accord- ingly, the FAX250 amplifier is shipped with no direct connection between its audio common and the chassis ground. If the preamplifier lacks such a connectio

20、n, the connection can be made at the FAX250, either by jumpering its Corn to its chassis at the intersection of C503 and C504, or externally. n. .+mm m+ Pnm%mat-n+;rr”e “LlJUL “IIIItztaI”IIJ The output terminal block is located on the left rear side of the amplifier chassis (see Figure 3). Make sure

21、 that all power to the amplifier, AC and DC, is turned off, then Page 4 9/93 FAX250 250-Watt Power Amplifier remove the two #6 hex nuts and the cover. After completing the connections, replace the cover Important: To prevent shorting to the cover, insulate any wire or spade lug that extends from the

22、 terminal block. The output transformer has a balanced and isolated multiple-tap secondary. For an unbalanced output, install an optional jumper, J500 (not supplied), to connect Corn and Com Out on the output terminal block; this jumper would reference one side of the transformer secondary to the ci

23、rcuit common. For isolated (balanced) operation, do not install this jumper. The 25-volt output winding of the output transformer is center-tapped. If it is necessary to ground this tap, place a jumper between it and a chassis ground. Connect the speakers and their associated matching transformers t

24、o the 8-ohm, the 25-volt (2.5-ohm), or the 70-volt (20-ohm) terminal and Com Out. Important! Both the National Electrical Code (NEC) and UL Standard 1711 require that power-limited fire-pro- tective signaling conductors (e.g., the amplifier in- put wires) be separated from all signaling conduc- tors

25、 originating from “nonpower-limited” circuits, such as the amplifier outputs and other Class I cir- cuits. Field-wiring circuits connected to any audio output on this amplifier must be treated as “nonpower-lim- ited” circuits, as defined by the NEC and applied in UL-1711. The installer should consul

26、t the documentation for the system in which the amplifier will be used and the NEC f o r further details. in parallel. The impedance taps on the primaries of the line-matching transformers indicate how much power will be taken from the line. Good practice suggests adding speakers as required until t

27、he total wattage absorbed by all of the transformers equals 80% to 85% of the maximum rated power output of the amplifier. This would mean operating the amplifier with a load between 200 and about 215 watts. AC Power Connections After all of the other connections have been made and The 8-ohm output

28、is generally used when the wires the system is ready for operation, plug the power cord into running to the speakers are relatively short and the line loss _ _ a 120-V, 60-Hz, three-wire grounded outlet that can provide is less than 0.5 dB. For best performance, make sure that 590 watts of power. Th

29、e ground connection automatically the nominal impedance of the total speaker load is 8 ohms. grounds the chassis, minimizing hum pickup and shock Use series or parallel speaker arrangements as needed to hazard. Check the local regulations before installing per- obtain the proper impedance match. man

30、ent AC lines and plugging in the equipment. The 25- and 70.7-volt outputs are for speakers designed To avoid draining the external 24-VDC battery, do not for constant-voltage lines. Each speaker must have a line- connect it until after the AC power has been connected. matching transformer, and the s

31、peakers must be connected Operation normal-blow) and reconnect the power to the amplifier (if Turn on the FAX250 by plugging its AC power cord into a battery is used, connect it last). a three-wire grounded outlet or by connecting it to a Input Level Control 24-VDC auxiliary power source. The pilot

32、LED then lights steadily to indicate that the amplifier is powered and ready The Input Level control (RPlOl) is recessed in the rear for use. panel (see Figure 3). This control can be adjusted with a standard -inch screwdriver. Fuse Lo-Cut Switch An excessive current surge during operation will caus

33、e Fuse F501 to open. If this happens, disconnect all power This switch, located on the rear of the amplifier, attenu- . . to the amplifier (DC first, if there is a battery) and determine ates the l o w frequencies e n o u g h to p r o v i d e p r o t e c t i o n for the cause of the failure. After c

34、orrecting the problem, speakers Always turn this low-cut filter on when horns and replace the fuse with one of the same type and value (10-A speakers with transformers are used; otherwise, it is not necessary to have this switch on This switch rolls off the lower frequencies whem it is in the left (

35、“On”) position; it 9/93 Page 5 FAX250 250-Watt Power Amplifier provides flat (normal) performance in the right (“Off”) position. Rear-Panel Screw and Mounting Bracket (3) Heat Sink Rear Panel 70.7 20 1 25 V 2.5 L! I 25 V C.T. I On Off Com (for us:kth R1006 Rear-Panel Hinge or R 1008) Figure 3. Rear

36、View of FAX250 Fuse (10 A Normal) Page 6 9/93 FAX250 250-Watt Power Amplifier Spade Terminals for I!?-_a_-_l m #W exusrnul u.b. Figure 4. Rear View of FAX250 with its Rear Panel Lowered S Pasr Dmnnl in m.e can be jum- pered to Common Out for unbalanced output). At rated output: 590 watts. No Signal:

37、 60 watts. At rated output: 17 Amps. .:.,. No Signal 600 milliamps. 1 O-Ampere, Normal-blow. Thermal cut-out; electronic overload circuit; AC fuse. Width: 19” (48.3 cm) panel; 17” (43.2 cm) body. Depth: 9.5” (24.1 cm). Height: 10.5” (26.7 cm). Charcoal gray baked enamel. 60 Ibs. (27.2 kg.). R1006 6OOQ Balancing Trans- former. l-.-*11 _.-. I .I-L SW .A-.- n i uua Zu-ktronm EnagIng Transformer. Page 8 9/93