Research Concepts RC2000A - Manual (Page 54)

54 RC2000A Dual Axis Antenna Controller Chapter 6 Troubleshooting
Before the controller executes an automatic move it checks to see if the azimuth, elevation, horizontal
polarization, and vertical polarization are within their respective limits. If they are not, the error message
is displayed. This error can occur if the limits were reset after the satellite position was programmed
into memory via SETUP mode. This error can also occur if the state of the Rotating Feed Present?
CONFIG mode item was changed after the satellite was programmed into non-volatile memory.
Recovering From Unexpected Memory Upsets
The key to restoring the non-volatile memory is getting the azimuth and elevation limits and position
counts right. The position counts are initialized to 30 when the azimuth counter-clockwise and down
limits are set. If the antenna can be unambiguously placed at the counter-clockwise and down limits,
non-volatile memory can be restored quite easily. It is probably a good idea to use a punch or a
waterproof magic marker to mark the antenna and mount assembly so that the azimuth counter-
clockwise and down limit positions can be identified. In addition, it may useful to identify and mark other
places on the mount where slippage could occur. This would allow the mount to be restored to its
original configuration. The procedure for restoring non-volatile memory is outlined in Appendix B Field
Upgrading.
Note that the procedure for restoring non-volatile memory only works if the count characteristics of the
actuators are not changed. If the actuator count characteristics are changed, the count values that
correspond to the west and up limit will change, as will the positions of all of the satellites.
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