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Maintenance

16

Servicing the Resistor

The load is designed to be quickly and easily repaired in the field. If a signifi-
cant change in the dc resistance is noted or if the resistor should fail, inexpen-
sive replacement resistors are available.

Figure 7 Load Exploded View - Model 8730

WARNING

Disconnect the unit from all power sources before servicing. The unit may

be energized from multiple sources. The potential for electric shock exists.

Outer Conductor

Label

Nipple
Locations

Housing

Water Chamber

Screws

Screws

Outer
Conductor

Housing
Flange

Center Conductor
Assembly

Housing Flange

Center Conductor
Assembly

Teflon Disk

DETAIL - Center
Conductor Assembly

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Содержание ECONOLOAD 8730 Series

Страница 1: ...SISTOR SERIES 8730 INCLUDING MODELS 8730A 8731 8732A 8738A AND 8738A110 Copyright 2009 by Bird Electronic Corporation Instruction Book P N 920 8730S Rev D Econoload and Termaline are Registered Trademarks of Bird Electronic Corporation ...

Страница 2: ...This Page Intentionally Left Blank ...

Страница 3: ...r is present WARNING Do Not Service Or Adjust Alone Under no circumstances should any person reach into an enclosure for the purpose of service or adjustment of equipment except in the presence of someone who is capable of rendering aid WARNING Safety Earth Ground An uniterruptible earth safety ground must be supplied from the main power source to test instruments Grounding one conductor of a two ...

Страница 4: ...ppears on the equipment indicating there is important information in the instruction manual regarding that particular area This symbol indicates that the unit radiates heat and should not be touched while hot 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 resul...

Страница 5: ...trol systems are used for 115 Vac and 230 Vac Use the correct interlock control for the specific voltage CAUTION If installed connect optional interlock before applying RF power CAUTION Do not contaminate the coolant with pipe sealant CAUTION Do not interrupt coolant supply Even momentary application of RF power while coolant is not circulating could cause immediate destruction of the load CAUTION...

Страница 6: ...DEL INSTRUMENTO BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI N EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L INSTRUMENT IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL P...

Страница 7: ...LTEN 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 QUALIFIÉ POUR CE FAIRE AS...

Страница 8: ...NCHER LE VERROUILLAGE À L ÉMETTEUR AVANT EMPLOI CONECTE EL INTERBLOQUEO AL TRANSMISOR ANTES DE LA OPERACION VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER ANSCHLIESSEN PRIMA DI METTERE IN FUNZIONE L APPARECCHIO COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE ...

Страница 9: ...o load Econoload or Load The entire unit It contains the RESISTOR Resistor A subcomponent of the LOAD This is the ceramic resistor which actually absorbs the RF power Literature Contents Chapter Layout Introduction Describes the features of the Econoload RF Load lists equipment supplied and optional equipment and provides power up instructions Theory of Operation Describes how the load works on a ...

Страница 10: ...viii ...

Страница 11: ...lorimetry 3 Chapter 3 Installation 5 Unpacking and Inspection 5 DC Resistance 5 Placement 5 Coolant 5 Hoses 5 Interlock Optional 6 Thermoswitch 8732A Only Optional 7 Installing the Thermoswitch 7 Connecting the Thermoswitch to the Interlock 7 Connecting the RF Power 8 Using a Swivel Flanged Coupling 8 Using an Unflanged Coupling 8 Using a Slotted Connector Sleeve for Model 8738A110 9 Chapter 4 Ope...

Страница 12: ...ing the Safety Light 15 Servicing the Resistor 16 Removing the Resistor 17 Inspection 17 Replacing the Resistor 17 Replacing the Conductor 18 Storage and Shipment 18 Storing the Load Resistor 18 Shipping the Load Resistor 18 Customer Service 19 Specifications 20 Replacement Parts 21 Bird 8730A 8732A and 8738A 21 Bird 8731 21 Bird 8738A110 21 Interlock Optional 21 Limited Warranty 22 ...

Страница 13: ...nd TV modulation and certain pulse types Contact Bird Electronic Corporation for information on using Econoloads with pulsed signals z Designed for easy field repair of all components Items Supplied z Load Water cooled z Instruction Manual Optional Items z Control system with red pilot light that turns on when the load is working properly Also has flow switch and 12 second time delay inter lock to...

Страница 14: ...Introduction 2 Figure 1 8730 Series Econoload Outline Drawing ...

Страница 15: ...witch is a normally open type and is closed during normal operation After flow is restored a time delay switch keeps the interlock open for an additional 12 seconds This ensures proper operation of the cooling system before applying RF power preventing resistor burnout Optional Thermal Interlock 8732A Only The 8732A can be supplied with an optional passive overtemperature thermo switch Normally cl...

Страница 16: ...Theory Of Operation 4 ...

Страница 17: ...ad so that the warning label is visible and the water connections are easily accessible z Access to a coolant supply or pump is required Make sure the coolant supply can meet the required flow rate z To use the optional interlock AC power is required Coolant For operation at 1kHz or lower use only distilled water as the coolant For opera tion above 1kHz use distilled or potable water Refer to the ...

Страница 18: ...l 2 Figure 2 Interlock Connections 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 Use ...

Страница 19: ...he thermoswitch jack B 3 Unscrew the small knurled cover fitting from the base plug D of the con nector to release the base 4 Thread the control switch wires through the clamp E with the washers F inside and its threaded fitting in place 5 Use short tips on the wires and put spaghetti sleeves over the ends if necessary 6 Solder the switch leads to the lugs G of the connector base Note The ring nut...

Страница 20: ...the bolt sets and tighten evenly all around to transmission line manufacturer s recommended torque Note Use all of the bolts Using an Unflanged Coupling To couple the unflanged connector with an unflanged RF line use an appro priate coupling kit Refer to Figure 5 while following the instructions below Figure 5 Unflanged Coupling 1 Insert the center bullet and bottom it on the midpoint nibs 2 Posit...

Страница 21: ...nector use an appropriate coupling kit 1 Insert the center bullet and bottom it on the center conductor 2 Position a clamping band over the input connector 3 Slide the slotted outer conductor of the load input over the unflanged transmission line until it is seated 4 Tighten the clamping band ...

Страница 22: ...Installation 10 ...

Страница 23: ...wer at the source Operation with the Optional Interlock 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 3 Listen for the flow switch to close it will click when it closes 4 Wait about 12 seconds Note The time delay switch should close and ...

Страница 24: ...g Down 1 Turn off RF power at the source 2 Wait at least five minutes for the Econoload to cool 3 Turn off ac power to the interlock control box 4 Turn off the water supply Always do this last Emergency Shutdown Turn off RF power at the source ...

Страница 25: ... functioning Inspection Routinely inspect the following components z Load Check the center and outer conductors for visible damage or excessive wear z Hoses Check for cracks or deterioration Make sure the hoses are securely fastened to the load Problem Possible Cause Correction Transmitter won t turn on or shuts off repeatedly Overheating Increase water flow Lower the ambient temperature Insuffici...

Страница 26: ...RF power and interlock circuitry 2 Disconnect the RF line 3 Connect the multimeter test leads to the center and outer conductor of the load Refer to Figure 6 4 Compare the measured value with the previous measurement and with the baseline resistance measured when the load was put into service Note If the new value differs from either of these by more than 2 ohms this could indicate a failing resis...

Страница 27: ... the top of the relay clamp 5 Press the clamp legs in slightly to release the relay 6 Pull the relay cartridge straight out of its socket 7 Insert the new relay cartridge and rotate it to align the opening in the cartridge with the center post nub in the socket 8 Make sure that the clamping prongs fit into their matching slots 9 Tighten the clamp screw to secure it 10 Turn on the interlock ac powe...

Страница 28: ... are available Figure 7 Load Exploded View Model 8730 WARNING Disconnect the unit from all power sources before servicing The unit may be energized from multiple sources The potential for electric shock exists Outer Conductor Label Nipple Locations Housing Water Chamber Screws Screws Outer Conductor Housing Flange Center Conductor Assembly Housing Flange Center Conductor Assembly Teflon Disk DETAI...

Страница 29: ...essfully removed inspect it carefully to insure that it has not been fractured In most cases even in the event of complete resistor burnout the resistor will remain intact Examine the inside of the load housing and water chamber for damage to inter nal parts especially the resistor O Ring seal and the resistor contact strip If the O Ring has cracks or if the contact strip has missing fingers repla...

Страница 30: ... outer conductor assembly 12 Note NOTE To only replace the outer conductor install it now and screw it into place 3 Remove the center conductor assembly 11 by pulling it carefully out of the load housing 0 4 Make sure the resistor 1 and inner flow tube 9 do not come out with the center conductor 5 Insert the new center conductor assembly into the load housing 6 Make sure the resistor fitting makes...

Страница 31: ...for any reason request an RMA through the Bird Technologies website link shown below All instruments returned must be shipped prepaid and to the attention of the RMA number Bird Service Center 30303 Aurora Road Cleveland Solon Ohio 44139 2794 Fax 440 248 5426 E mail bsc bird technologies com For the location of the Sales Office nearest you visit our website at http www bird technologies com ...

Страница 32: ...or adapter Operating Position Any Coolant For operation at 1kHz or lower use only distilled water as the coolant For operation at greater than 1kHz use distilled or potable water Coolant Connections standard hose thread barbed hose fitting model 8738A110 Temperature Range 5 to 60 C 41 to 140 F Flow Rate Min 4 gal min 15 2 L min 5 C 41 F 6 gal min 22 7 L min 60 C 140 F Flow Rate Max 12 gal min 45 4...

Страница 33: ...8732A 8730A 8738A 1 8732A052 8730A052 8738A053 7 16 Jack IEC Type 169 4 8732A only 1 4240 344 Description Qty Part No Water Chamber Assembly 1 8731 003 Center Conductor Assembly includes resistor 1 8731 005 Outer Conductor Assembly 1 8731 004 Description Qty Part No Hose Connector 2 5A2857 1 Center Conductor Assembly 1 8738A113 Outer Conductor Assembly 1 8738A112 Description Qty Part No Flow Switc...

Страница 34: ...uch claim for breach of these war ranties shall be deemed to be waived by Buyer unless made in writing within ten 10 days from the date of discovery of the defect The above warranties shall not extend to any products or parts thereof which have been subjected to any misuse or neglect damaged by accident rendered defective by reason of improper installation or by the performance of repairs or alter...

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