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Summary of Contents for Bird Electronic Econoload 8730A
- Page 1 INSTRUCTION BOOK ® ECONOLOAD LOAD RESISTOR SERIES 8730 INCLUDING MODELS 8730A, 8731 8732A, AND 8738A ©Copyright 2005 by Bird Electronic Corporation Instruction Book P/N 920-8730S Rev. C ® ® Econoload and Termaline are Registered Trademarks of Bird Electronic Corporation...
- Page 2 This Page Intentionally Left Blank...
- Page 3 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 thoroughly understood and applied to all phases of operation and maintenance. Keep Away From Live Circuits Operating personnel must at all times observe normal safety regulations.
- Page 4 Bird 8730 Series Econoload RF Load Resistor Safety 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 indicates that a shock hazard exists if the precautions in the instruction manual are not followed.
- Page 5 Caution Statements The following equipment cautions appear in the text whenever the equipment is in danger of damage and are shown here for emphasis. CAUTION Incorrect hose connections will reverse coolant flow and could destroy the load. CAUTION Different control systems are used for 115 Vac and 230 Vac. Use the correct interlock control for your voltage.
- Page 6 Bird 8730 Series Econoload RF Load Resistor Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY PROTECTION. EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO.
- Page 7 WARTUNG ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR FÜR GESCHULTES FACHPERSONAL. ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND WARTUNGSARBEITEN AUSSCHLIEßLICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUFÜHREN. ENTRENTIEN L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX, NE PAS EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ...
- Page 8 Bird 8730 Series Econoload RF Load Resistor About This Manual This manual covers the Bird 8730A, 8731, 8732A, and 8738A Econoload RF Load Resistor. This instruction book is arranged so that essential information on safety is in the front of the book. Reading the Safety Precautions before operat- ing the equipment is strongly advised.
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Page 9: Table Of Contents
Table of Contents Introduction ....... 1 Features ........1 Items Supplied . - Page 10 Maintenance ......13 Troubleshooting ....... . . 13 Maintenance .
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Page 11: Introduction
VSWR of less than 1.1:1 from 1 kHz to 1000 MHz. Useable with CW, AM, FM, SSB, and TV modulation, and certain Features pulse types. Contact Bird Electronic Corporation for information on using Econoloads with pulsed signals. Make precise, calorimetric measurements by using an Econoload with a Bird 6085 Calorimeter. - Page 12 Bird 8730 Series Econoload RF Load Resistor Figure 1 Depends On 8730 Series Connector Econoload Outline Drawing Depends On Connector ECONOLOAD® TERMALINE® 12" (305 mm) Water Output Water Input 2.5" (64 mm)
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Page 13: Theory Of Operation
Chapter 2 Theory Of Operation Bird 8730 Series Econoloads consist of a thin-film-on-ceramic resistor Resistor immersed in externally-supplied coolant. The coolant flows directly over the resistor instead of using an intermediate heat transfer system, reducing the load size to a minimum. After passing over the entire length of the resistor, the coolant leaves the load and can either be discarded or cooled in a heat exchanger and reused. -
Page 14: Calorimetry
Bird 8730 Series Econoload RF Load Resistor Almost all the RF power in the load is transferred to the coolant as Calorimetry heat. There is no heat transfer to the outer housing of the load, leaving it at ambient temperature even at full power. The flow rate, and the difference between the input and output coolant temperatures, can be used to calculate the power dissipated in the load with the following formula:... -
Page 15: Installation
3. Inspect all of the components for visible signs of damage. Immediately notify the shipping carrier and Bird Electronic Corporation of equipment damage or missing parts. Before first using the load, get a resistance baseline for future DC Resistance maintenance. -
Page 16: Coolant
Bird 8730 Series Econoload RF Load Resistor Coolant For operation at 1kHz or lower, use only distilled water as the coolant. For operation above 1kHz use distilled or potable water. Refer to the specifications for the definition of potable water. If the water quality is doubtful, use distilled water. -
Page 17: Interlock (Optional)
Installation Interlock (Optional) WARNING Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists. WARNING Improper wiring could result in electric shock and death. CAUTION If installed, connect optional interlock before applying RF power. CAUTION Different control systems are used for 115 Vac and 230 Vac. -
Page 18: Thermoswitch (8732A Only) (Optional)
Bird 8730 Series Econoload RF Load Resistor Thermoswitch (8732A Only) (Optional) CAUTION If installed, connect optional interlock before applying RF power. The 8732A, only, can be equipped with an optional interlock thermoswitch, P/N 2450-095-x. To install or replace this: 1. Stand the unit with the water connectors up to prevent spills. 2. -
Page 19: Connecting Rf Power
Installation Connecting RF Power After installing the Econoload, the RF transmission line can be attached using standard coaxial line coupling kits. WARNING Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied. Leaking RF energy is a potential health hazard. - Page 20 Bird 8730 Series Econoload RF Load Resistor Unflanged Coupling: To couple the unflanged connector with an unflanged RF line, use an appropriate coupling kit. Refer to Figure 5 while following the instructions below: Figure 5 BULLET RF COAXIAL CLAMPING CONNECTOR LOAD Unflanged LINE...
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Page 21: Operating Instructions
Chapter 4 Operating Instructions Operation without Interlock Normal Operation CAUTION Do not interrupt coolant supply. Even momentary application of RF power while coolant is not circulating could cause immediate destruction of the load. 1. Turn on the coolant supply. NOTE: Minimum flow rate is 4 gal/min (15 L/min) at 5 °C (40 °F). The minimum flow increases linearly up to 6 gal/min (23 L/min) at 60 °C (140 °F.) 2. -
Page 22: Operation With The Optional Interlock
Bird 8730 Series Econoload RF Load Resistor Operation with the Optional Interlock CAUTION If installed, connect optional interlock before applying RF power. 1. Turn on ac power to the interlock control box. 2. Turn on the coolant supply. NOTE: Minimum flow rate is 4 gal/min (15 L/min) at 5 °C (40 °F). The minimum flow increases linearly up to 6 gal/min (23 L/min) at 60 °C (140 °F). -
Page 23: Maintenance
Chapter 5 Maintenance Troubleshooting The table below contains troubleshooting information for problems which can occur during normal operation. This manual cannot list all malfunctions that may occur, or their corrective actions. If a problem is not listed or is not corrected by the listed actions, notify a qualified service center. -
Page 24: Inspection
Bird 8730 Series Econoload RF Load Resistor Routinely inspect the following components: Inspection Load: Check the center and outer conductors for visible damage or excessive wear Hoses: Check for cracks or deterioration. Make sure the hoses are securely fastened to the load. Measuring the dc resistance between the inner and outer conductors DC Resistance of the RF connector shows changes in the load over time, a good check... -
Page 25: Repair
Maintenance Repair WARNING Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied. Leaking RF energy is a potential health hazard. WARNING Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists. -
Page 26: Safety Light
Bird 8730 Series Econoload RF Load Resistor To replace the red safety light on the interlock control box: Safety Light 1. Turn off the RF power and interlock circuitry, and disconnect the RF line and ac line. 2. Unscrew the lens cover at the top of the control box to expose the bulb. -
Page 27: Resistor Servicing
Maintenance Resistor Servicing The load is designed to be quickly and easily repaired in the field. If a significant change in the dc resistance is noted or if the resistor should fail, inexpensive replacement resistors are available. WARNING Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. -
Page 28: Resistor Removal
Bird 8730 Series Econoload RF Load Resistor Numbers in brackets [ ] refer to the labeled parts in Figure 7. Parts Resistor Removal may appear slightly different than what is shown for some models. 1. Disconnect the load from the RF line and the interlock control box, remove the water hoses, and drain off any water still in the load. -
Page 29: Conductor Replacement
Maintenance 3. Bottom the resistor in the fitting. 4. Put the resistor and center conductor in the load housing [0]. 5. Screw the flow tube [7] into the water chamber assembly. Make sure it is screwed in completely to avoid damaging the resistor. 6. -
Page 30: Preparation For Storage Or Shipment
Bird 8730 Series Econoload RF Load Resistor Preparation for Storage or Shipment Store the Bird 8730 in a cool, dry area. Drain the coolant and cap the openings if the unit will be stored for more than 30 days. To ship, drain the coolant and cap the openings. Pack the unit in its original shipping container. -
Page 31: Specifications
Maintenance Specifications Frequency Range 8730A dc - 1000 MHz 8731 1 kHz - 1000 MHz 8732A dc – 45 MHz 8738A 1 kHz – 1000 MHz Power Rating All models except 8732A 10 kW average 8732A Depends on flow rate. See table below. Power Min Flow at Thermoswitch Thermoswitch... -
Page 32: Replacement Parts
Bird 8730 Series Econoload RF Load Resistor Replacement Parts Bird 8730A, 8732A, DESCRIPTION PART NO. and 8738A Resistor Assembly 8738A072 Water Chamber Assembly 8738A073 Hose Connector 5-065-2 Housing, Rear 8738A071 Housing, Front 8738A054 ⁄ Phillips Head Screw, 8-32 x " 1118-1211-00 ⁄... -
Page 33: Interlock (Optional)
Maintenance Interlock DESCRIPTION PART NO. (Optional) Flow Switch 5-898-6 Interlock Control Assembly 115 Vac 8750-101-1 230 Vac 8750-101-2 Interlock Control Assembly Components Relay Clamp 8630-193 Time Delay Relay 115 Vac 5-1664 230 Vac 5-1665 Indicator Light 115 Vac 5-970-1 230 Vac 5-970-2 Thermoswitch (8732A Only) Opens at 72 °C... - Page 34 Limited Warranty All products manufactured by Seller are warranted to be free from defects in material and workmanship for a period of one (1) year, unless otherwise specified, from date of shipment and to conform to applicable specifications, drawings, blueprints and/or samples. Seller’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted;...
- Page 35 Models: 8738A 8730A The undersigned hereby declares, on behalf of Bird Electronic Corporation of Cleveland, Ohio, that the above-referenced product, to which this declaration relates, is in conformity with the provisions of the following standards: European Standard EN 61010-1:1993 - Safety, Group II.
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