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8.7.4 - Motor Calibration
The system can be “homed” from the debug menu. Type “home” from any capitalized
debug prompt and press enter. This should display the “HOME>” prompt.
The system (or individual axis) will need to be “homed” if an “invalid position” indicator
shows up in either the angle or position commands.
DC>
home
HOME>
The system can go through a full, 3-axis calibration by typing “h” and pressing enter.
The elevation will raise (or lower) to a predetermined elevation. The skew will then
rotate all of the way in one direction until it encounters a hard stop and then return to
zero degrees. The azimuth will rotate clockwise until it encounters the magnetic
position sensor or hits the hard stop. If it hits the hard stop it will rotate
counterclockwise until it senses the magnetic sensor. The azimuth will then return to
zero degrees. The elevation actuator will then lower the dish until it hits the hard stop.
The elevation actuator may clutch several times. This is normal and does not cause any
damage.
Each axis can be calibrated (homed) individually. In order to calibrate the skew and
azimuth motors the system must be at or above a minimum elevation angle (10
degrees). In order to home the elevation motor the azimuth and skew must be at zero
degrees.
Each motor is identified by a number. The azimuth is motor 0, the elevation is motor 1,
and the skew is motor 2. The format for a specific motor calibration command is “h
[motor#].
The following command homes the azimuth. Wait for the system to complete moving
before attempting to issue another command.
HOME>
h 0
HOME>
Important Note: Typing “s” and pressing enter at any time stops all motors. The
calibration may not be complete.
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