Coaxial Dynamics 86735 Instruction Manual

Rf air-cooled coaxial load

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Coaxial Dynamics

6800 Lake Abram Drive

Middleburg Heights, OH 44130

Telephone: (440) 243-1100

Fax: (440) 243-1101

A CDI INDUSTRIES, INC. COMPANY

Web Site: www.coaxial.com

SPECIALISTS IN RF TEST EQUIPMENT & COMPONENTS

E-mail: support@coaxial.com

Instruction Manual

Model 86735

RF Air-Cooled

Coaxial Load

Table of Contents

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Summary of Contents for Coaxial Dynamics 86735

Page 1 Coaxial Dynamics 6800 Lake Abram Drive Middleburg Heights, OH 44130 Telephone: (440) 243-1100 Fax: (440) 243-1101 A CDI INDUSTRIES, INC. COMPANY Web Site: www.coaxial.com SPECIALISTS IN RF TEST EQUIPMENT & COMPONENTS E-mail: support@coaxial.com Instruction Manual Model 86735 RF Air-Cooled Coaxial Load...
Page 3: Warranty
Before using, the user shall determine the suitability of the product for the intended use; and the user assumes all risk and liability whatsoever in connection therewith. The foregoing is the only warranty of Coaxial Dynamics and is in lieu of all other warranties expressed or implied.
Page 4: Introduction
This manual gives you specific information on the installation, operation and service Model 86735 Series Air-Cooled Coaxial Load. Most of the loads are field serviceable, but we recommend their return to us for repair. Mistakes can be costly compared to the low cost for our trained personnel to make the repairs and return the load to new performance specifications.
Page 5: Table Of Contents
3-4 Installation ..................10 3-5 Location .................10,11 3-6 Mounting ..................11 3-7 Connections ................11 3-8 Ducting ..................11,12 3-9 Adjustments ................12 Preparation for Reshipment ............12 IV. Theory of Operation 4-1 General ..................13 4-2 Control Circuits ................13 86735 Rev. Dec. 2000 - 4 - Coaxial Dynamics...
Page 6: Precautions
5-3 RF Circuit (including resistor replacement) ......14,15 VI. Diagrams Schematic Diagrams ..............16-18 Parts List ....................19 VII. Specifications...................20 VIII. Illustrations Model 86735 RF Coaxial Air-Cooled Load .........cover Vertical Side Panel Displaced............21 Access Panels Displaced/Resistor Assembly ........22 PRECAUTIONS 86735 Rev. Dec. 2000 - 5 -...
Page 7: Operating Temperature
PROVISIONS ARE MADE TO TRIP THE INTERLOCK IN THE EVENT OF OVERHEAT, BUT THE INTERLOCK MUST BE PROPERLY CONNECTED TO THE RF SOURCE FOR THIS FUNCTION TO OPERATE. NEVER OPERATE WITH INTERLOCK DISCONNECTED OR MALFUNCTIONING. SECTION I 86735 Rev. Dec. 2000 - 6 - Coaxial Dynamics...
Page 8: Purpose And Application Of Equipment
DESCRIPTION AND LEADING PARTICULARS 1-1. Purpose and Application of Equipment. The Model 86735 Coaxial Load is designed to safely dissipate a maximum of 35,000 watts of electrical energy over a frequency range of DC to 220 Mhz. 1-2. Equipment Supplied. The Model 86735 Coaxial Load is supplied with standard RF connectors.
Page 9: Mechanical Description
Model 86735. The fan may continue to run for some time. This depends upon the power level at which the load was operating and upon the ambient air temperature.
Page 10: Test Equipment And Special Tools
1 Torx T-15 driver 1 Tee handle hex key, 7/32" bit 1 Power screwdriver with 7/32" hex key & torx T-15 bit 86735 Rev. Dec. 2000 - 9 - Coaxial Dynamics...
Page 11: Preparation For Use And Reshipment
General guidelines are outlined in subsequent paragraphs. 3-5. Location. The location selected for the Model 86735 should be dry, free of excessive dust and have an ambient temperature below 110°F (40°C). The room should be well ventilated to prevent excessive temperature rise and consequent derating of the unit.
Page 12: Mounting
3-8. Ducting. In many installations it will be necessary to duct the discharge air from the Model 86735 to the exterior of the building. In some installations it will also be necessary to supply inlet air from outside of the climate controlled portion of the building.
Page 13: Adjustments
"Make-up air" is a ventilation term used to indicate the supply of outdoor replacement air to a building in a controlled manner. It may be provided for the Model 86735 by ducting into the room or by extending a supply duct to either intake grill of the blower enclosure and installing a blanking plate on the other grill.
Page 14: Theory Of Operation
SECTION IV THEORY OF OPERATION 4-1. General. The Model 86735 contains a 50 ohm non-reactive resistor assembly (24 @ 300 ohms) which is cooled by forced air supplied by a centrifugal blower assembly. Control of the blower and of the transmitter interlock circuit is accomplished with a single rocker switch and five thermal switches.
Page 15: Maintenance
FAILURE TO FOLLOW THESE DIRECTIONS MAY CAUSE FATAL ELECTRICAL SHOCK! 5-1. Cleaning. The enclosure of the Model 86735 is finished with an acrylic finish or other durable coating system. It should be cleaned with a neutral plastic and glass cleaner such as Windex or Glass Plus.
Page 16 When installing nuts on the 1/4-20 X 2 screws, take care not to overtighten them and fracture the resistors. The resistors are hard, brittle ceramic material. It is very important to avoid impact and excessive force when installing or removing them. 86735 Rev. Dec. 2000 - 15 - Coaxial Dynamics...
Page 17: Schematic Diagrams
SECTION VI SCHEMATIC DIAGRAMS Model 86705 – 86735 with optional Differential Pressure Switch and Remote Activation 86735 Rev. Dec. 2000 - 16 - Coaxial Dynamics...
Page 18 SECTION VI (cont’d) SCHEMATIC DIAGRAMS Model 86705 – 86775 with optional Differential Pressure Switch and Remote Activation 86735 Rev. Dec. 2000 - 17 - Coaxial Dynamics...
Page 19 SECTION VI (cont’d) SCHEMATIC DIAGRAMS Model 86710 – 86735 with optional Differential Pressure Switch and Remote Activation (380V – 460V 3 Phase 50 - 60Hz) 86735 Rev. Dec. 2000 - 18 - Coaxial Dynamics...
Page 20: Replacement Parts List
161-3M222-000 Motor, 115 volt, 60Hz 161-3M300-000 Motor, 208-240v, 50Hz 161-4M140-000 Motor, 380 volt, 50Hz 161-4M439-000 Ceramic Standoffs, 2-1/8" 340-10000-017 Resistor, PFS18-301CPK 091-06735-000 Circuit Breaker, 3 amp/2 pole 666-10000-004 Fuse, FNQ2 304-10000-004 86735 Rev. Dec. 2000 - 19 - Coaxial Dynamics...
Page 21: Specifications
Impedance ---------------------------------------------------------------- > 50 ohms nominal VSWR @ DC to 240Mhz ---------------------------------------------- > 1.15:1 max. Connectors: Model 86735-1 --------------------------- > 3-1/8" EIA swivel flange Model 86735-2 --------------------------- > 3-1/8" Unflanged recessed Model 86735-3 --------------------------- > 3-1/8" Unflanged flush Power Rating @ Sea Level -------------------------------------------- > 35 KW Frequency Range-------------------------------------------------------- >...
Page 22: Vertical Side Panel Displaced
SECTION VIII Model 86735 Vertical Side Panel Displaced 86735 Rev. Dec. 2000 - 21 - Coaxial Dynamics...
Page 23: Access Panels Displaced/Resistor Assembly
SECTION VIII (cont’d) Model 86735 Access Panels Displaced / Resistor Assembly 86735 Rev. Dec. 2000 - 22 - Coaxial Dynamics...