Model 2175 MiniMast™ User Manual
ETS-Lindgren L.P. reserves the right to make changes to any products herein to improve functioning or design. Although the information in this document has been carefully reviewed and is believed to be reliable, ETS-Lindgren does not assume any liability arising out of the application or use of any product or circuit described herein; nor does it convey any license under its patent rights nor the rights of others. All trademarks are the property of their respective owners.
Table of Contents Notes, Cautions, and Warnings ......................................................................... v 1.0 Introduction ................................................................................................... 7 Standard Configuration ............................................................................................................. 8 Optional Items .......................................................................................................................
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Notes, Cautions, and Warnings Note: Denotes helpful information intended to provide tips for better use of the product. Caution: Denotes a hazard. Failure to follow instructions could result in minor personal injury and/or property damage. Included text gives proper procedures. Warning: Denotes a hazard. Failure to follow instructions could result in SEVERE personal injury and/or property damage. Included text gives proper procedures.
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1.0 Introduction The ETS-Lindgren Model 2175 MiniMast™ is a portable, electric-powered mast and platform system designed to be used with the Model 2090 Multi-Device Controller (or next generation ETS-Lindgren controller, if applicable) for EMI compliance testing. The MiniMast is designed for antenna scanning from 1 meter to 4 meters. The mast, carrier, platform, lifting rope, and guying system are non-conductive and non-magnetic.
The antenna carrier is raised and lowered by a fractional horsepower, electric, variable speed motor. A worm-type gearbox driven by the motor provides the adequate torque needed to raise and lower the carrier and prevents the carrier from back-driving the motor. The motor and associated electronics are contained in a shielded enclosure mounted beneath the platform of the unit. Under command of the controller, the motor typically positions the carrier within one centimeter of the desired location.
• 3-meter fiber optic control cable for connection to Model 2090 controller (or next generation ETS-Lindgren controller, if applicable) outside chamber • Two ST-to-ST bulkhead feedthroughs provide a means to penetrate a shield wall and maintain the integrity of the shielded enclosure • Air polarization (adjustable speed) • Infrared (IR) Remote Optional Items • Model 2090 Multi-Device Controller (or next generation ETS-Lindgren controller, if applicable): This controller provides control for two sep
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2.0 Maintenance Before performing any maintenance, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. Warranty may be void if maintenance is performed incorrectly. Maintenance of the Model 2175 MiniMast™ is limited to external components such as cables or connectors. If you have any questions concerning maintenance, contact ETS-Lindgren Customer Service. Maintenance Recommendations Regular maintenance will prolong the service of your mast assembly.
SIX-MONTH CHECK • Check the lift rope and guy line for signs of wear. • Inspect the components and tubing of the pneumatic polarization mechanism for signs of corrosion, excessive moisture, and wear. • Lubricate the air cylinder O-rings to prevent excessive wear. • Check all cabling to the motor base for frayed and worn insulation. Replacement and Optional Parts See the drawings located in the back pocket of this manual for the part numbers to order replacement or optional parts for the MiniMast.
3.0 Specifications Electrical Specifications Nominal AC Voltage 220 VAC Input Frequency 50/60 Hz Current Rating 10 Amp service Phase Single Physical Specifications Base Dimensions 0.90 m x 0.90 m 2.95 ft x 2.95 ft Weight 81.2 kg (179.0 lb) Overall Height 4.61 m (15.1 ft) Mast Height Nominal 4.
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4.0 Assembly and Installation Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. The Model 2175 MiniMast™ is shipped partially assembled; the assembly process will take approximately one hour. Ensure that a clear area is available to unpack and assemble the MiniMast. Prior to starting the assembly process, open the shipping container and check all parts for any shipping damage.
Product Assembly 1. Attaching the motor is the first step of the assembly process. Locate the motor in the packaging under the positioner base. Lay the motor with the winch drum facing the direction of the slot provided in the base. Roll the platform over the top of the motor and find the brackets under the platform that pin the motor into position. Tabs on motor slide between the brackets on the platform. Figure 2: Motor attached to bottom of MiniMast 2.
3. Continuing with the assembly, insert the mast into the support angles on the platform. An axle bushing with stud and nuts for securing in place is on the platform. Carefully remove the fiber optic cable packed into the lower end of the mast and straighten the leads. Insert the mast between the two angle supports in approximately the correct position. Insert the mast axle. After the axle is in place, route the fiber optic limit cables through the fiber optic hole provided in the platform.
Figure 4: Securing the Mast Cap 5. Unwind the rope from the winch drum and feed it over the pulleys so that the free end lines up with the clamp on the carrier brake assembly. Feed the rope through the clamp on the brake assembly and tighten clamp nuts hand tight. Further adjustment will be necessary once the mast is completely assembled.
Figure 6: Screw Placement 6. The mast brackets should be installed according to the orientation shown in previous illustrations. Using the #2 Phillips screwdriver provided, tighten the screws through the large and small mast brackets through the mast and into the nut plate that is already fitted with inserts. 7. Engage the brakes on the swivel casters of the platform so that they will not roll. Carefully raise the mast to a vertical position and insert the lock pin provided to hold it in place.
Outdoor applications require guying to stabilize the mast against wind. For outdoor applications, engage the lock on the swivel casters at this time. Figure 7: Boom Placement 10. Pull the coiled hose out of the carrier and insert the primary boom as pictured into the carrier. Note the position of the knobs on the boom gear and on the boom bearings. The gear back-up roller should be directly behind the rack gear and the cylinder should be in a fully compressed state.
LOCATION OF CONNECTIONS Assembly and Installation | 21
LOCATION OF CONNECTIONS, CONTINUED Figure 8: Location of Connections 11. Coiled hoses that were located inside the carrier should be connected to the fittings on the platform for the polarization to become operable. All connections to the motor base should be completed at this time including fiber optic limits and control lines, along with compressed air and electrical power. Route all connections through the connection entry on the platform tube so they will exit through the connection exit.
12. Slightly engage the air lines onto the fittings and note the position of the boom. Energize the air line supply to the motor base. If the boom is in horizontal polarization (holes in the boom are on top), fully engage the hoses onto the fittings provided. If the boom is in vertical polarization, turn the air off and reverse the air lines and then fully engage them on the fittings provided in the platform. Air line pressure should be between 60–80 psi (4.14–5.52 bar). Do not exceed 80 psi (5.52 bar).
The branch circuit supplying power to the motor base should be protected from excess current according to local electrical codes. Whenever possible the motor should be powered from a separate branch circuit of adequate current capacity to keep voltage drop to a minimum during startup and running. Check that the conductor size is adequate for the motor load and the distance from the mains source.
Carrier Safety Brake A safety brake is mounted on the carrier assembly. In the event that the carrier is released from the rope suspension, a spring-loaded cam jams the brake into position against the mast and slows the vertical movement of the carrier. The safety brake is not intended to completely restrict movement of the carrier. Always exercise extreme caution when the safety brake is engaged. To release the carrier safety brake, support the carrier and release the brake roller.
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5.0 Operation Before connecting any components, follow the safety information in the ETS-Lindgren Product Information Bulletin included with your shipment. See the Model 2090 Multi-Device Controller (or next generation ETS-Lindgren controller, if applicable) manual if you are unfamiliar with the operation of the unit. A manual is included with each controller shipment and is also available for download from www.ets-lindgren.com.
If the value is below 1000, the resolution of the encoder is low and the controller will not provide 0.1 cm resolution, even though the display shows that digit. If the value has gone past 9999, the encoder has too many counts per meter and the controller cannot correct for it. In this case, contact ETS-Lindgren for assistance. 5. Enter this value for the encoder calibration value and reset the limits and position information. 6.
Figure 9: Boom Load Limitations Operation | 29
Pre-Operational Checks • Verify that the power lines are connected to the motor base for the MiniMast, controller, and any other equipment that will be used to test. • Verify the fiber optic cables are connected to the motor base. • Verify the limit fibers are connected to the motor base. • Verify the antenna connected to the boom is securely mounted in place. • Connect the feed cable to the antenna. • Verify the load of the antenna is within the operating specifications.
Button Volume Left Command Volume Right Counterclockwise for rotational positioner Clockwise for rotational positioner Mode Polarization for linear positioner Operation | 31
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Appendix A: Warranty See the Product Information Bulletin included with your shipment for the complete ETS-Lindgren warranty for your Model 2175 MiniMast™. DURATION OF WARRANTIES FOR THE MINIMAST All product warranties, except the warranty of title, and all remedies for warranty failures are limited to two years.
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Appendix B: Drawings These drawings are included in the pocket located on the back cover of the manual: • 108983, Crossboom • 109276, 2175 Carrier • 109356, 2175 Positioner (2 pages) Drawings | 35
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Appendix C: EC Declaration of Conformity EC Declaration of Conformity | 37
REF DRAWING REVISIONS ECO# NOTES: 1) CUT ROPE 1 EA. 29.5 FT. BURN ENDS AND INSTALL ON WINCH DRUM. TAPE TO HOLD IN PLACE FOR SHIPPING. 2) CUT ROPE 3 EA. 18 FEET. BURN ENDS AND INSTALL IN HOLES PROVIDED IN MAST CAP FOR GUYING. REV 5120 B DESCRIPTION CHANGED ROPE DATE APPROVED 09/14/06 SRK 6 2X APPLY TAPE TO FULL WIDTH OF BASE AND THEN APPLY 1" LENGHTS EQUALLY SPACED, 6" ON CENTER TO CLOSURE. 17 34.25 34.50 C D 4 4486.28 176.63 7 A 18 B 6 8 ATTACH TWIN HOSE TO FITTINGS ON AIR CYLINDER.
REF DRAWING REVISIONS ECO# NOTES: REV 5120 37 38 B DESCRIPTION CHANGED ROPE DATE APPROVED 09/14/06 SRK 10 31 TWIN HOSE ATTACHES HERE. 11 24 25 12 33 35 DETAIL B SCALE 1 : 2 40 9 5 1 27 2 29 16 DETAIL C SCALE 1 : 2 DETAIL E SCALE 1 : 1 39 36 13 14 3 30 DETAIL D SCALE 1 : 2 EMC Test Systems, L.P. Cedar Park, TX 26 DETAIL A SCALE 1 : 2 34 UNLESS OTHERWISE SPECIFIED: DIMENSIONS ARE IN INCHES TOLERANCES ARE: DECIMALS ANGLES X.XX ± .015 X.XXX ± .005 ± .
