Dawn CONTROL-1500A Manual page 64

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CONTROL-1500A Single Axis Antenna Controller
Chapter 6 Troubleshooting/Alarm Codes
This error is usually caused by the horizontal and vertical polarizations for a given satellite
being programmed at the same position. If you turn off the AutoPol function and the controller
does not toggle the polarization position as the H and V keys are pressed in MANUAL mode,
the polarization positions have probably been programmed at the same value. Other AutoPol
problems result from not having a ground wire connected between the satellite receiver and
the controller. Please refer to figures 3.2 and 3.3.
WHEN A SATELLITE IS SELECTED VIA AUTO MODE THE CONTROLLER DISPLAYS
THE MESSAGE 'ENTRY SELECTED HOLDS INVALID DATA'.
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 '24vdc ROT FEED' CONFIG mode item was changed after the satellite was
programmed into non-volatile memory.
DISABLING RUNAWAY ERRORS
The controller has a provision to only allow the accumulation of position counts when the
antenna has been commanded to move, or movement has just ceased (as defined by the
Az/El Fast Deadband and Az/El Slow Deadband CONFIG mode items). This has the effect of
disabling RUNAWAY errors. It is generally not recommended to disable the runaway error. If
necessary, it can be accomplished by setting the Az/El Fast Deadband CONFIG mode item to
a value which ends in '01', i.e. 2001, 2301, etc.
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