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BIRD Termaline 8940SC Series Operation Manual

Semiconductor load resistor
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®
Termaline
Semiconductor
Load Resistor
Series 8940SC
Operation Manual
This unit requires the supplied vent plug be installed prior to use.
Operating the unit without the vent plug installed WILL result in equipment damage and may
cause personal injury.
© Copyright 2023 by Bird Technologies, Inc.
Instruction Book Part Number 920-8940-SEMICON Rev. B
®
Termaline
is a Registered Trademark
of Bird Electronic Corporation

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Summary of Contents for BIRD Termaline 8940SC Series

  • Page 1 This unit requires the supplied vent plug be installed prior to use. Operating the unit without the vent plug installed WILL result in equipment damage and may cause personal injury. © Copyright 2023 by Bird Technologies, Inc. Instruction Book Part Number 920-8940-SEMICON Rev. B ®...
  • Page 3 Safety Precautions 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 apply to all phases of operation and maintenance. Keep Away From Live Circuits Operating Personnel must at all times observe general safety precautions.

  • Page 4: Safety Symbols

    Termaline® Semiconductor Load Resistor Safety Symbols Warnings call attention to a procedure, which if not correctly performed could result in personal injury. Cautions call attention to a procedure, which if not correctly performed could result in damage to the instrument. The caution symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area.

  • Page 5: Warning Statements

    Safety Precautions Warning Statements The following safety warnings appear in the text where there is danger to operating and maintenance personnel and are repeated here for emphasis. The load weighs 236 lbs (107 kg), do not attempt to lift alone. Two or more people, or mechanical assistance, are required to lift the load.

  • Page 6: Caution Statements

    See page 7. Do not use a cleaning solution that will damage the plastic parts of the fan. See page 12. Use only Bird coolant, P/N 5-1070, to prevent damage to the load. See page 13.

  • Page 7: Safety Statements

    Safety Precautions 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. BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN.
  • Page 8 Termaline® Semiconductor Load Resistor SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO.
  • Page 9 Safety Precautions CONNECT INTERLOCK TO TRANSMITTER/GENERATOR/AMPLIFIER BEFORE OPERATING. BRANCHER LE VERROUILLAGE À L’ÉMETTEUR/GÉNÉRATEUR/AMPLIFICATEUR AVANT EMPLOI. CONECTE EL INTERBLOQUEO AL TRANSMISOR/GENERADOR/AMPLIFICADOR ANTES DE LA OPERACION. VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER/GENERATOR/VERSTÄRKER ANSCHLIESSEN. PRIMA DI METTERE IN FUNZIONE L’APPARECCHIO, COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE/GENERATORE/AMPLIFICATORE.

  • Page 10: About This Manual

    When inquiring about updates to this manual refer to the part number and revision on the title page. Chapter Layout Introduction — Describes the features of the Bird Termaline RF Load Resistor lists equipment supplied and optional equipment, and provides power-up instructions. Theory of Operation —...

  • Page 11: Table Of Contents

    Table of Contents Safety Precautions ..............i Safety Symbols .
  • Page 12 Termaline® Semiconductor Load Resistor RF Assembly Resistance Test ..............13 DC Resistance Measurement .

  • Page 13: Chapter 1 Introduction

    Chapter 1 Introduction Bird 8940 Series Semiconductor Loads are general purpose, 50 ohm, coaxial RF transmission line terminations, useful as standby reject loads. They provide accurate, dependable, and low reflection line terminations over a frequency range of DC – 20 MHz, specially calibrated for great stability at 13.56 MHz. Up to 15,000 watts can be dissipated.

  • Page 14: Chapter 2 Theory Of Operation

    Theory of Operation Load Resistor Bird 8940 Loads consist of two thin-film-on-ceramic resistors immersed in a dielectric coolant. The resistors, individually selected for accuracy, are enclosed in special housings. When surrounded by the coolant, this produces a uniform, practically reflectionless line termination over the specified frequencies.

  • Page 15: Chapter 3 Installation

    If the shipping container is not damaged, unpack the unit. Save shipping materials for repackaging. 2. Inspect unit for visual signs of damage. If there is damage, immediately notify the shipping carrier and Bird Technologies. Site and Shelter Requirements Do not block airflow. The air intake vent on the bottom of the load must not be obstructed.

  • Page 16: Mounting

    Bird 8940 Loads are intended for stationary or fixed use. The mounting brackets on front and rear faces have four mounting holes arranged in a 7" x 40-23/32" (177.8 x 1031.3 mm) rectangle. Use a screw with a 3/8" (9.5 mm) diameter max.

  • Page 17: Thermoswitch

    Installation Thermoswitch Bird 8940 Loads can be equipped with an optional interlock thermoswitch, P/N 8890-017. It is normally closed, opening at 226 °C (439 °F), with a rating of 10 A @ 120 VAC and 5 A @ 230 VAC.

  • Page 18: Interlock Connection

    Termaline® Semiconductor Load Resistor The vent plug must be installed at all times when the unit is in operation or cooling. Always check to ensure vent plug is installed prior to operation. Failure to do so WILL result in damage to the equipment and endanger the operator’s safety. 10.

  • Page 19: Ac Power Connection

    Installation AC Power Connection Turn off AC power and RF power when attaching the power cable. Check the local electrical code for proper AC hookup prior to operation of the unit. Make sure the neutral or return hookup is only used for that purpose. The AC power supply required for this unit is 115/230 V, depending on the model, @ 50/60 Hz, 1.

  • Page 20: Chapter 4 Operating Instructions

    Blower Controls Bird 8940 Loads are equipped with a control switch and indicator light on the front of the blower, underneath the RF connector. The switch is labeled “MANUAL/AUTOMATIC”. When the switch is set to MANUAL, the fans will run continuously.

  • Page 21: Emergency Shutdown

    Operating Instructions Emergency Shutdown Turn off RF power at the source. If the interlock thermoswitch is properly connected, RF power will be automatically turned off when the coolant temperature reaches an unsafe level.

  • Page 22: Chapter 5 Maintenance

    Chapter 5 Maintenance This chapter covers routine maintenance, troubleshooting, specifications, and replacement parts for Bird 8940 Loads. Disconnect the unit from all power sources before servicing. The unit may be energized from multiple sources. The potential for electric shock exists.

  • Page 23: Routine Maintenance

    Maintenance PROBLEM POSSIBLE CAUSE CORRECTION Lower RF power (See "Specifications" on page 20 RF power too high for maximum RF power) Check the coolant level. Add coolant if necessary Coolant level too low (See "Inspect the Coolant" on page 13 Replace coolant (See "Inspect the Coolant"...

  • Page 24: Clean The Load

    Termaline® Semiconductor Load Resistor Clean the Load  The outside surface of the unit should be wiped free of dust and dirt when necessary.  Clean the cooling fins. Excessive dust on the cooling fins will interfere with heat dissipation. ...

  • Page 25: Inspect The Coolant

    1. Remove the load resistor (Refer to "Load Resistor Replacement" on page 15 Use only Bird coolant, P/N 5-1070, to prevent damage to the load.  The coolant should be clear, with a faint yellow tinge, and have a slightly sweet smell.

  • Page 26: Dc Resistance Measurement

    Termaline® Semiconductor Load Resistor  Use low resistance leads, preferably a short piece of 50 ohm coaxial cable fitted with an appropriate connector or alligator clips.  Temperature of the load should be stabilized between 20°C to 25°C (68°F to 77°F). DC Resistance Measurement Never attempt to connect or disconnect RF equipment from the transmission line while RF power is being applied.

  • Page 27: Repair

    The potential for electric shock exists. RF Connector Replacement The 8941-115SC13 has a Bird “QC” connector which allows easy changing of the RF connector. This does not disturb the coolant seal or affect the electrical continuity of the load. To change the connector: ...

  • Page 28: Indicator Light Replacement

    Termaline® Semiconductor Load Resistor 6. Inspect the coolant, see "Inspect the Coolant" on page 13 7. Install the entire load resistor assembly. The load resistor assembly cannot be further disassembled. When replacing the RF assembly, ensure that the end of the RF assembly fits into the support rod on the rear panel in the load.
  • Page 29 "Specifications" on page 20 4. Press the drawer into the AC module until it locks into place. 5. If the fans still do not run or if the fuse burns out again, return the unit to Bird for service. Figure 5...

  • Page 30: Fan Replacement

    Termaline® Semiconductor Load Resistor Fan Replacement When ordering a replacement fan, be sure to specify the model, the fan part number, AC voltage, and fan position. The fan will be provided with lugs and leads of the right length for direct attachment to the terminal block. Different fans are used in the 115V and 230V loads.

  • Page 31: Storage And Shipment

    Any maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified service center. If the unit needs to be returned for any reason, request an Return Material Authorization (RMA) through the Bird Technologies website. All instruments returned must be shipped prepaid and to the attention of the RMA number.

  • Page 32: Specifications

    Termaline® Semiconductor Load Resistor Specifications Frequency Range DC – 20 MHz Power Rating 15 kW continuous duty Impedance, Nominal 50 ohms VSWR 1.10 max Connector “QC” Type, Female 7/16 DIN normally supplied AC Power –115 115 V +10, –6% @ 50/60 Hz ±3% –230 230 V +10, –6% @ 50/60 Hz ±3% AC Line Power Rating...

  • Page 33: Replacement Parts

    Maintenance Replacement Parts Description Part Number RF Load Resistor 8941-117 Resistor O-Ring 5-230 Clamping Band Assembly 2430-055 Plugs Vent 2450-094 Shipping 2450-049 Interlock Thermoswitch 8890-017 Thermoswitch Body 8890-015 Thermoswitch Connector Jack 2450-018 Control Thermoswitch 8892-333 Thermoswitch Body 8892-334 Thermoswitch Connector Jack 2450-018 Coolant, 9.5 gal (36 L) 5-1070-3...

  • Page 34: Available Qc Connectors

    230 V, 5x20mm Type T, 3.15A 5A2257-21 Neon Lamp 115 V 5A2409-1 230 V 5A2409-2 Switch, Toggle 5A2312 Contact Bird AC Line Supply Cable Technologies for the 115 V correct power cord for 230 V your unit. Available QC Connectors Connector...

  • Page 35: Limited Warranty

    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;...

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