Andrew OM24SNG-RC User Manual
Andrew Corporation
10500 West 153rd Street
Orland Park, IL U.S.A. 60462
Telephone: 708-349-3300
FAX (U.S.A.): 1-800-349-5444
Internet: http://www.andrew.com
Customer Service, 24 hours: U.S.A. • Canada • Mexico: 1-800-255-1479
U.K.: 0800 250055 • Republic of Ireland: 1 800 535358
Other Europe: +44 1592 782612
Printed in U.S.A. 7/02
Copyright © 2002 by Andrew Corporation
Operation and Maintenance
Bulletin OM24SNG-RC
Type ES24SNG-LTE-( )
2.4-Meter SNG
2.4-Meter SNG Earth Station Antenna
Introduction
Description
Maintenance
Emergency
Procedures
Component
Replacement
Specifications
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Proprietary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Information and Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Antenna Drive System Cable Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cable Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Azimuth Rotational Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Azimuth Drive Cable Tension Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Elevation Drive Cable Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Controls and Power Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Azimuth Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Elevation Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replacement
Azimuth Brake Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Elevation Brake Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Antenna Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Antenna Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Antenna Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table of Contents
2
Table of Contents
Purpose
Proprietary Data
Information and
Assistance
Notice
The purpose of this manual is to provide installation and preventive maintenance
required to support the 2.4M SNG Antenna Assembly and Motor Drive System. This
manual is subdivided into six sections to provide convenient reference for operator/service personnel requiring technical information on general system and equipment.
A separate user’s manual is provided with each RCI 3000 or 3050 control system.
The technical data contained herein is proprietary to Andrew Corporation. It is intended
for use in operation and maintenance of Andrew supplied equipment. This data shall not
be disclosed or duplicated in whole or in part without express written consent of Andrew
Corporation.
Andrew Corporation provides a world-wide technical support network. Refer to the technical assistance portion of this this manual for the contact numbers appropriate to your
location.
The installation, maintenance, or removal of antenna systems requires qualified, experienced personnel. Andrew installation instructions have been written for such personnel.
Antenna systems should be inspected by qualified personnel to verify proper installation,
maintenance and condition of equipment.
Andrew Corporation disclaims any liability or responsibility for the results of improper or
unsafe installation and maintenance practices.
All designs, specifications, and availabilities of products and services presented in this
manual are subject to change without notice.
Copyright © 1998, Andrew Corporation
3
Introduction
Introduction
Technical
Assistance
24-hour Technical Assistance
For technical assistance, call the following numbers at anytime.
Call From Call To Telephone Fax
North America (toll free) U. S. A. 1-(800)-255-1479 (800)-349-5444
Any Location U. S. A. (708)-349-3300 (708)-349-5410
(International)
Customer Service Center
The Andrew Customer Service Center gives you direct access to the information and
personnel service you need, such as the following:
• Place or change orders
•
Check price and delivery information
• Request technical literature
You can call from any of the following:
Call From Telephone Fax
North America 1-800-255-1479 (toll free) 1-(800)-349-5444 (toll free)
United Kingdom 00-800-0-255-1479 (toll free) 00-800-0-349-5444 (toll free)
Australia 0011-800-0-255-1479 (toll free) 0011-800-0-349-5444 (toll free)
China 00-800-0-255-1479 (toll free) 00-800-0-349-5444 (toll free)
New Zealand 00-800-0-255-1479 (toll free) 00-800-0-349-5444 (toll free)
Hong Kong 001-800-0-255-1479 (toll free) 001-800-0-349-5444 (toll free)
4
Introduction
Safety Summary
The following general safety precautions are not related to any specific procedures and,
therefore, do not appear elsewhere in this publication. Personnel must understand and
apply these precautions during all phases of operation and maintenance.
Keep Away From Live Circuits
Personnel must observe all applicable safety regulations at all times. Ensure power is
removed from unit before replacing components. Potential hazards may exist even
though the power control is in the off position. Capacitors retain charges. Always remove
power and use test equipment to confirm that a circuit is at ground potential before
touching it. Never reach into or enter an enclosure to service or adjust the equipment
until the absence of power has been confirmed.
Do Not Service Or Adjust Alone
Under no circumstances should any person reach into the enclosure for the purpose of
servicing or adjusting the equipment except in the presence of someone who is capable
of rendering aid.
Resuscitation
Personnel working with or near high voltage should be familiar with modern methods of
resuscitation. Such information may be obtained from local medical personnel.
ESD Precaution
This equipment contains electrostatic discharge (ESD) sensitive devices. Equipment
handling methods and materials must be used to prevent equipment damage.
5
Introduction
Antenna
The 2.4-meter transportable SNG antenna from Andrew has been designed to be more
compact and lighter. This new design results in an antenna whose total assembly weight
has decreased by 33%.
This antenna design reduces overall windloading, is easier to install and is less costly to
ship. The stow height is at 24” for more overall clearance for the truck.
The vehicle mountable 2.4-meter prime focus offset fed antenna from Andrew incorporates performance and optional characteristics particularly suited for television broadcast
industry satellite news gathering applications.
The exclusively designed prime focus, beam-shaping feed configuration, together with
the precision hydroformed aluminum reflector assembly, produces extremely high gain,
superior efficiency and closely controlled pattern characteristics.
A motorized cable drive system provides a reliable, precise and smooth running system.
The SNG antenna options are the RCI 3000 and 3050 control systems.
Antenna travel is stow to +65° (optional 90°) in elevation and ±175° in azimuth.
Each SNG antenna is fully-integrated and pretested before leaving the factory to reduce
vehicle installation time and costs.
6
Reflector
Assembly
Feed
System
Polarization
Drive Assembly
Azimuth
Drive Assembly
Elevation
Drive Assembly
Description
Description
General
Introduction
Antenna Drive
System Cable
Inspection
7
Maintenance
Maintenance
The antenna and feed boom/reflector assembly incorporates self lubricating bearing
assemblies throughout its construction, eliminating the need for any additional lubrication
for the life of the antenna.
The feed system is factory precision aligned for optimum performance, moving or repositioning feed system will only reduce performance capabilities. Do not move the feed system.
The polarization drive system does not require any periodic maintenance; however
replacement of the polarization drive chain may be necessary after extended use (usually several years).
Periodic maintenance of the Roto-Lok®drive normally requires only visual inspection for
misalignment or damaged cables. In the event that a cable(s) may require replacement,
the drive design incorporates sufficient clearance between the capstan and drum, allowing removal and installation of individual cables. In the event the drive has become disabled due to broken/tangled cables and cannot be driven safety to a stow/repair position, the margin of safety in the drive design, will allow for a cable(s) to be removed to
enable the drive to be rotated to a safe stow/repair position for cable replacement.
Operation with less than the total number of cables is not recommended as normal operational mode, however the drive will function with reduced stiffness temporarily while
awaiting replacement cable installation.
Drive cables should be periodically checked for cable misalignment or visible damage
that might lead to broken wires and or tangled cables. Look for frayed/broken cable
wires that might occur due to normal wear after extended lifetime, or through contact
with foreign objects, such as hand tools during servicing of the antenna. In the event of
frayed/broken wires are discovered, they should be replaced as soon as possible to prevent damage to neighboring cable assemblies.
Check cables every four weeks for the first six months of operation (cable tension,
frayed/broken wires). Thereafter, monitor cables biannually. For continuous use of antenna drive system, shorten the above recommended periodic interval by one half.
The rated capacity/stiffness of the Roto-Lok®drive system is directly related to tension
within the cables configuring the azimuth and elevation drive system. Proper cable tension is essential for the antenna drive system to perform as specified. How to verify and
maintain proper cable tension is considered in the following discussion.
CAUTION!
Do Not Over Tension the Cable When Tightening the Cable Tension Adjusting
Nuts. It is Possible to Break a Cable With the Mechanical Advantage of the
Threaded End!
Cable
Replacement
Azimuth
Rotational Limits
8
Maintenance
The two adjustment locations for the five azimuth cables are 224° apart on the azimuth
ring. To reach these adjustment locations the antenna must be rotated so the azimuth
cable access port is over the adjustment location. Rotation to the counter-clockwise
(CCW) adjustment location may be hindered by hardware and software limits.
This document primarily addresses azimuth cable tension requirements and also
includes elevation cable tension requirements for completeness.
Cable replacement is beyond the scope of normal maintenance, please consult Andrew
Corporation for assistance.
Depending on how the azimuth hard limits are currently configured, a hard limit override
may need to be made to allow sufficient rotation of the antenna for azimuth cable tension adjustment to be made. The "hard limits" are small, limit switch, trip blocks located
inside the azimuth ring. The azimuth hard limits may be configured for ±175°, ±135° or
±90° of travel by simply changing the hard limits actuation blocks installed position (one
hard limit for clockwise and one hard limit for counterclockwise rotation). The azimuth
hard limits are factory configured for ±175° of travel in both clockwise and counter-clockwise directions.
During the installation of the antenna onto the truck, the azimuth hard limits may
have been changed by the integrator to less than ±175° of rotation. If the azimuth
hard limits are at ±175° the following procedure WILL
NOT
be necessary. Skip
down the following Procedure and start at section marked CABLE TENSION
ADJUSTMENT,
AZIMUTH DRIVE. If the azimuth hard limits are configured for
±135°, or ±90° the following provisions will need to be made prior to starting
azimuth cable tensioning procedure.
The counter-clockwise hard limit must be set to the 175° CCW position during the cable
tension adjustment procedure, then later re-configured. The clockwise hard limit will not
need to be removed/changed from any position of operation during the azimuth cable
tensioning procedure, only the CCW hard limit.
Review the overhead view of the antenna to determine the location of the CCW azimuth
hard limit and re-position the hard limit actuation block to the 175° CCW location (position #3). Each actuation block is held in place by two #4-40 UNC x 1/2, SST, Flat Head
Screws. The retaining screws are installed with Loctite
®
, persistence may be required to
remove them. Careful inspection of the interior of the azimuth ring will reveal marked,
steel stamped degree and orientation information on the surface of the ring (i.e. 135°
CCW, 90° CCW, 175° CW etc.) use these marked locations to confirm correct position of
the azimuth hard limits.
After the counter-clockwise hard limit has been relocated to 175° CCW position, a second level of protection for azimuth rotation will need to be addressed.
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