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1、INSTRUCTION BOOK OPERATING INSTRUCTIONS TERMALINELOAD RESISTOR MODEL 8578A100GIG Electronic Corporation Cleveland (Solon) Ohio USA Copyright 1998 by Bird Electronic Corporation Instruction Book Part Number 920-8578A100GIG Preliminary Termalineand Thrulineare Registered Trademarks of Bird Electronic
2、Corporation This is a preliminary manual. Specifications, limits, and text are subject to change without notice. The information within this manual was as complete as possible at the time of printing. Bird Electronic Corporation is not liable for errors. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资
3、料库 Safety Precautions The following are general safety precautions that are not necessarily related to any specific part or procedure, and do not necessarily appear elsewhere in this publication. These precautions must be throughly understood and ap- plied to all phases of operation and maintenance.
4、 Keep Away From Live Circuits Operating personnel must at all times observe normal safety regulations. Do not replace components or make adjustments to the equipment with the high voltage supply turned on. To avoid casualties, always remove power. Do Not Service Or Adjust Alone Under no circumstance
5、s should any person reach into an enclosure for the purpose of service or adjustment of equipment except in the presence of some- one who is capable of rendering aid. Safety Earth Ground An uninterruptible earth safety ground must be supplied from the main power source to test instruments. Grounding
6、 one conductor of a two conduc- tor power cable is not sufficient protection. Serious injury or death can occur if this grounding is not properly supplied. Shock Hazard Do not attempt to remove the RF transmission line while RF power is pres- ent. Radiated RF power is a potential health hazard. Safe
7、ty Symbols WARNING Warning notes call attention to a procedure, which if not correctly performed could result in personal injury. CAUTION Caution notes call attention to a procedure, which if not correctly performed could result in damage to the instrument. This symbol appears on the equipment indic
8、ating there is important information in the instruction manual regarding that particular area. i RadioFans.CN 收音机爱 好者资料库 ?Note: Calls attention to supplemental informa- tion. Warning Statements The following safety warnings appear in the text where there is danger to op- erating and maintenance pers
9、onnel and are repeated here for emphasis. WARNING Do not insert a screwdriver or any thin metal objects through the perforated cooling air grilles while the load is in operation. The power within the unit could arc over and will cause serious injury to personnel and damage to the unit. WARNING Disco
10、nnect this unit from RF power sources before any disassembly for repair or replacement procedures. The potential for electrical shock exists. WARNING Surface can reach temperatures in excess of 100C when maximum power is applied to load. WARNING Limit the interlock terminal to less than 30 Vrms. Alt
11、hough the interlock terminal is rated to 230 Vac, the potential for electrical shock exists. Caution Statements The following equipment cautions appear in the text whenever the equipment is in danger of damage and are repeated here for emphasis. CAUTION Connect interlock before RF operation. CAUTION
12、 Do not apply more than the rated RF power to load. Excessive RF power will damage the load resistors. CAUTION Do not block airflow. Air enters the housing through perforated grilles at the side of the unit and exhausts through the opposite grille of the unit. Blocking these grilles could cause unit
13、 failure. ii Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUMENTS SAFETY PROTECTION. USO EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIN DE SEGURIDAD DEL INSTRUMENTO. BENUTZUNG WI
14、RD DAS GERT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERTESICHERHEIT BEEINTRCHTIGT WERDEN. UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI NEST PAS EXPLICITEMENT PRVUE PAR LE FABRI- CANT PEUT ENDOMMAGER LE DISPOSITIF DE PRO- TECTION DE LINSTRUMENT. IMPIEGO QUALORAQUEST
15、OSTRUMENTOVENISSE UTILIZZATOINMODODIVERSODACOME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA. SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SER- VICE - TRAINED PERSONNEL ONLY. TO AVOID DAN- GEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO
16、 SO. SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVODELPERSONALDESERVICIO CAPACITADO. PARA EVITAR EL PELIGRO DE DESCARGAS ELCTRICAS, NO REALICE NINGN iii SERVICIO A MENOS QUE EST CAPACITADO PARA HACERIO. WARTUNG ANWEISUNGEN FR DIE WARTUNG DES GERTES GELTEN NUR FR GESCHULTES FACHPERSONA
17、L. ZUR VERMEIDUNG GEFHRLICHE, ELEKTRISCHE SCHOCKS,SINDWARTUNGSARBEITEN AUSSCHLIELICHVONQUALIFIZIERTEM SERVICEPERSONAL DURCHZUFHREN. ENTRENTIEN LEMPLOI DES INSTRUCTIONS DENTRETIEN DOIT TRE RSERV AU PERSONNEL FORM AUX OPRATIONS DENTRETIEN. POUR PRVENIR UN CHOCLECTRIQUEDANGEREUX,NEPAS EFFECTUER DENTRET
18、IEN SI LON NA PAS T QUALIFI POUR CE FAIRE. ASSISTENZA TECNICA LE ISTRUZIONI RELATIVE ALLASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO. PER EVITARE PERICOLOSESCOSSEELETTRICHENON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A FARLA. CONNECT INTERLOCK TO TR
19、ANSMITTER BEFORE OPERATING. BRANCHER LE VERROUILLAGE LMETTEUR AVANT EMPLOI. CONECTE EL INTERBLOQUEO AL TRANSMISOR AN- TES DE LA OPERACION. VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER ANSCHLIESSEN. PRIMA DI METTERE IN FUNZIONE LAPPARECCHIO, COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE. Bird Mode
20、l 8578A100GIG Termaline Load Resistor iv About This Manual This instruction book covers the model 8578A100GIG Termaline Load Resis- tor. This instruction book is arranged so that essential information on safety ap- pears in the front of the book. Reading the Safety Precautions Section before operati
21、ng the equipment is strongly advised. The remainder of this Instruction Book is divided into Chapters and Sections. At the beginning of each chapter, a general overview describes the contents of that chapter. Operation First time users should read Chapter 1 - Introduction, Chapter 2 - Theory Of Oper
22、ation, and Chapter 3 - Installation, to get an overview of equipment ca- pabilities and installation. An experienced operator can refer to Chapter 4 - Operating Instructions. All instructions necessary to operate the equipment appear in this chapter. Maintenance All personnel should be familiar with
23、 preventative maintenance found in Chapter 5 - Maintenance. If a failure should occur, the troubleshooting sec- tion will aid in isolating and repairing the failure. Parts For location of major assemblies or parts, refer to the parts lists and associ- ated drawings in Chapter 5. Changes To This Manu
24、al We have made every effort to ensure this manual is accurate. If you should discover any errors or if you have suggestions for improving this manual, please send your comment to our factory. This manual may be periodically updated. When inquiring about updates to this manual refer to the part num-
25、 ber and revision level on the title page. v Bird Model 8578A100GIG Termaline Load Resistor vi Table of Contents Safety Precautions.i Warning Statements.ii Caution Statements .ii Safety Statements.iii About This Manual. .v Introduction .1 General .1 Description.1 Unpacking and Inspection.3 Site and
26、Shelter Requirements .3 Theory Of Operation.5 General .5 RF Section Description.5 HeatTransfer .5 Interlock Control Circuit .5 Installation.7 Mounting Location.7 Placement .7 Interlock Connections .7 Connecting RF Line.8 Swivel Flange Coupling.9 Unflanged Coupling .9 vii Operating Instructions .11 G
27、eneral.11 Load Power .11 Operation Under Normal and Abnormal Conditions .11 Shut Down .11 Measurement and Monitoring of RF Power.12 Maintenance.13 Troubleshooting .13 Cleaning .13 Outside Surfaces .13 Interior Surfaces .14 Diagnosing the RF Assembly .14 Replacing Resistors.15 Replacing the Thermoswi
28、tch .15 Customer Service .16 Preparation for Storage or Shipment .16 Storage .16 Shipment .16 Replacement Parts List.17 Bird Model 8578A100GIG Termaline Load Resistor viii Chapter 1 Introduction GeneralThe Model 8578A100GIG is an air cooled, high powered Termaline Load resistor designed to be effici
29、ent, rugged and trouble free. It is designed to be forced air cooled and is ca- pable of dissipating RF line power up to 10 kW, with 1000 ft3/min (28.32 m3/min) or more of externally supplied cool- ing air through it. Virtually maintenance free and simple to operate, this unit should provide years o
30、f trouble free opera- tion yet is field repairable in the event of failure of the load resistor or other components. The RF section is composed of a parallel combination of resistors. DescriptionThe unit is rectangular in shape. It is supported on three sides by four bumper feet on each side. The RF
31、 input con- nector is located on the front panel of the unit. Perforated side panel grilles on two sides of the unit allow for direct forced air cooling of the resistors. The transmitter interlock is located on the front panel of the unit. The rear and side panels are removable for servicing. Refer
32、to Figure 1, Out- line Drawing. WARNING Do not insert a screwdriver or any thin metal objects through the perforated cooling air grilles while the load is in operation. The power within the unit could arc over and will cause serious injury to personnel and damage to the unit. 1 Specifications Impeda
33、nce50 ohms nominal VSWR1.15:1 maximum 88-108 MHz ConnectorsStandard 1-5/8 Diameter Swivel Flange Optional 3-1/8 Diameter Unflanged Power Rating 10 kW continuous duty ? 1000 ft3/min (28.32 m3/min) of air (externally supplied) Frequency Range88 - 108 MHz Dimensions: with connector: without connector:
34、27-5/8L x 16-15/32W x 19-11/16H (702 x 418 x 500 mm) 25-5/32 x 16-15/32 x 19-11/16 (639 x 418 x 500 mm) Ambient Temperature-40C to +40C (-40F to 104F) Interlock contact rating10 Amp 120 Vac 5 Amp 250 Vac Cooling Method Forced air cooled ? 1000 ft3/min (28.32 m3/min) (externally supplied) Weight, Nom
35、inal34 lbs (15.3 kg) FinishGrey Powder Coat Environmental Specificaiton Safety:In conformity with European Standard EN-61010-1:1993 - Safety, Group II in ac- cordance with Council Directive 89/336/EEC (May 3, 1989), on Electro- magnetic Compatibility, as amended by Council Directive 92/31/EEC (April
36、 28, 1992). Bird Model 8578A100GIG Termaline Load Resistor 2 Unpacking and Inspection 1.Carefully inspect the shipping container for signs of damage. If damage is noticed, do not unpack the unit. Immediately notify the shipping carrier and Bird Electronic Corporation of the damage. 2.If the containe
37、r is not damaged, unpack the unit. Save the packing materials for repacking. 3.Inspect all of the components for visual signs of damage. Immediately notify the shipping carrier and Bird Electronic of equipment damage or missing parts. Site and Shelter Requirements The equipment is not intended for e
38、xposed outdoor use, or use in areas of condensing humidity. The surrounding air must be free of contaminants or particles that could be drawn into the air intakes. These load resistors have no in- termediate dielectric fluids or coolant and require no cooling water hookups. The unit should be placed
39、 where adequate space is available for air circulation. Do not enclose the unit in a small room or closet without proper ventilation. In small rooms or restricted areas, the heat given off by the unit may increase the ambient temper- ature to an unacceptable level for sufficient cooling of the re- s
40、istors. Introduction 3 Bird Model 8578A100GIG Termaline Load Resistor 4 Figure 1 Model 8578A100GIG Outline Drawing Chapter 2 Theory of Operation GeneralThe 8578A100GIGis a high powered, air-cooled, RF load used for termination of coaxial transmission lines. The RF energy, when converted into heat, i
41、s transmitted directly to the external area by a forced air system. RF Section Description The RF section of the 8578A100GIG is composed of a paral- lel combination of tubular resistors. These resistors are carefully positioned to provide a reduction in surge imped- ance proportional to the distance
42、 along the resistive system, which finally terminates to the housing forming the return path for the coaxial circuit. This produces a very uniform and almost reflectionless line termination over the stated frequencies of the load resistor. Heat Transfer The resistors used in the 8578A100GIG are of a
43、 tubular ce- ramic type, situated in an angled position within their hous- ing. When the unit is in operation, externally forced air is blown into the side grille opening and directed over the RF resistor network. The heat, developed in the resistors from dissipation of the RF energy, is carried off
44、 by the flow of air over the resistors surface. The hot air is then exhausted through the opposite side grille openings in the unit. Interlock Control Circuit The interlock control circuit provides fail-safe protection of the transmitter and load resistor in the event of an overload situation. This
45、protection is necessary because dissipation of the heat generated by the RF power is critically dependent upon a required minimum flow of external cooling air at all times. If the airflow over the resistor array should stop or be restricted and the temperature in the RF chamber should rise beyond a
46、safe limit, the heat sensor unit will sense the change and actuate the interlock relay to reverse the pro- cess and turn off the transmitter. The interlock system will not permit re-operation of the transmitter until the air flow is restored and a safe low temperature in the RF housing is once again
47、 attained. 5 Bird Model 8578A100GIG Termaline Load Resistor 6 Chapter 3 Installation This chapter provides information for on site requirements, unpacking, inspection, and preparing the Model 8578A100GIG for use. Mounting Location This unit is designed for use in any of the mounting configu- rations called out in the outline drawing. CAUTION Do not block a
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