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OPERATING THE ACU
Level vial
Tilt bias
Select operation
process
OPERATION
S A V E
8. Execute the command of the selected item from OPERATION*.
STEP SIZE ELEVATION CROSS LEVEL
#0.2#
00.0 01.0
OPERATION*
t SAVE: save and execute the current settings.
t IDLE ON/OFF: the motor brakes will be released while IDLE MODE is ON. The
antenna will restart automatically if IDLE MODE is re-set from ON to OFF touch BACK
key is pressed to exit SETUP mode.
tREBOOT: the antenna will restart automatically if REBOOT ANTENNA is ON.
t RATESENSOR BIAS: rate sensor bias is to calibrate DC voltage output from the three
rate sensors used to sense antenna motion in azimuth, elevation and cross-level axes.
The DC voltage output from each of the rate sensors may vary by an amount which is
directly proportional to the direction and rate of motion induced on it. The motion of the
ship must be stable when the sensor box is replaced.
tTILT BIAS: TILT BIAS is to adjust the two solid-state tilt sensors used to provide absolute
cross-level tilt of the antenna and elevation feedback to eliminate long-term pointing drift
(error). The TILT BIAS is required to be set when the system is newly installed or when the
antenna control board or sensor box is replaced. Check and see if the bubble is located
at the center of the level vial. If not, touch OK key to enter TILT BIAS menu to adjust it.
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