Troubleshooting - RESEARCH CONCEPTS RC3050 User Manual

38 RC3050 Antenna Controller
Limit Switches
The various limit switches serve as safety interlocks to prevent mount damage. The RC3050 checks for
limit conditions via both software and a Programmable Logic Device on the analog board. The following
table summarizes the interlock logic employed:
LIMIT INTERLOCK LOGIC
Azimuth STOW Elevation movement below the Elevation DOWN position is not allowed unless the
Azimuth STOW condition is active.
Azimuth CCW CCW movement in azimuth is not allowed when the azimuth CCW condition is
active.
Azimuth CW CW movement in azimuth is not allowed when the azimuth CCW condition is
active.
Elevation DOWN No azimuth movement is allowed when the Elevation DOWN condition is active.
Elevation STOW No further elevation down movement is allowed when the Elevation STOW
condition is active. NOTE: when the Elevation STOW condition is active, the
RC3000 internally also generates an Elevation DOWN condition.
Elevation UP No further elevation up movement is allowed when the Elevation UP condition is
active.
Polarization CCW CCW movement in polarization is not allowed when the polarization CCW
condition is active.
Polarization CW CW movement in polarization is not allowed when the polarization CW condition is
active.
Polarization STOW Elevation movement below the Elevation DOWN position is not allowed unless the
Polarization STOW condition is active. NOTE: only certain mounts mechanize the
Polarization STOW limit switch – check appendix B for your mount.
Many problems are caused by limit switches either activating incorrectly or the RC3000 not sensing the
limit switch's state correctly. Some examples of problems caused by limit switch sensing follow:
Mount will move down in elevation but not up. Check that the Elevation UP limit switch is not stuck in
the active state.
Mount will not move below the DOWN elevation limit. Check that the Azimuth STOW limit switch has
activated correctly. Also check the polarization STOW limit switch if the mount is so equipped.
Mount will only move up in elevation. Check that the Elevation STOW limit switch is not stuck in the
STOW condition.
Mount is above the Elevation DOWN position but will not move in azimuth. Check that the Elevation
DOWN limit switch is not active.
Failure of a limit switch to activate properly may be due to the limit switch mechanism itself, cabling to the
limit switch or failure of the RC3050 to sense the limit switch correctly. Isolating the problem to the
RC3050 or switch/wiring may be accomplished by jumpering the appropriate pins on the J3 connector.
NOTE: only the Elevation STOW/DOWN/UP, Azimuth STOW and Polarization STOW (if applicable) are
mechanized via discreet limit switches – Azimuth CW/CCW and Polarization CW/CCW limits are
mechanized differently and will be discussed later.
After removing the wiring harness from J3, the first thing to check is that 12 VDC is present at the "+" pin
of each limit switch. Pins 2,5,9,10 and 11 should have +12 VDC present (see 2.2.4 – J3 wiring diagram).
If +12 VDC is not present, there is a power supply failure within the RC3050. Contact your vehicle
integrator, mount manufacturer or RCI for further instructions on how to proceed.
Research Concepts, Inc.; 5420 Martindale Road; Shawnee, Kansas 66218-9680 USA
Chapter 5

5.0 TROUBLESHOOTING

38
Troubleshooting
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