Maintenance and Troubleshooting
9797A-27 C-Band TXRX
7-4
provided by combining the ships gyro compass input and the antenna relative position.
7.3.2. Antenna Initialization (Series 97A & Series 00 )
Turn the pedestal power supply ON. The PCU will initialize the stabilized portion of the mass to be level
with the horizon and at a prescribed Azimuth and Elevation angles. The antenna will go through the
specific sequence of steps (listed below) to initialize the level cage, elevation, cross-level and azimuth to
predetermined starting positions.
Initialization is completed in the following phases, each phase must complete properly for the antenna to
operate properly (post-initialization). Observe the Initialization of the antenna pedestal.
Step 1. The level platform motor drives the Level Cage CW, issuing extra steps to assure that the
cage is all the way to the mechanical stop. Then the Level Cage will be driven exactly 45.0
degrees CCW.
Step 2. Elevation axis then activates - Input from the LV axis of the tilt sensor is used to drive the
Elevation of the equipment frame to bring the tilt sensor LV axis to level. This step takes
approximately 10 seconds and will result in the dish being at 45.0 degrees in elevation. The level
cage may still be tilted left or right at this time.
Step 3. Cross-Level axis activates - Input from the CL axis of the tilt sensor is used to drive
Cross-Level of the equipment frame to bring the cross-level axis of the tilt sensor to level (this
results in the tilt of the Cross-Level Beam being level). This step takes approximately 10 seconds.
Step 4. Azimuth axis activates - Antenna drives CW in azimuth until the “Home Flag” signal is
produced. This signal is produced by a Home Switch hitting a cam (or by a Hall Effect sensor in
close proximity to a Magnet). After another 10 second wait, the antenna will report its version
number at the Antenna Control Unit (ACU).
This completes the phases of initialization. At this time the antenna elevation should 45.0 degrees and
Relative azimuth should be at be at home flag (home switch engaged on the home flag cam).
If any of these steps fail, or the ACU reports model "
xx
97", re-configure the PCU as described in the
Setup section of this manual. If initialization still fails, this indicates a drive or sensor problem, refer to the
Troubleshooting section.
7.3.3. Antenna Position Error Monitoring
The ACU provides a means for monitoring the position error of the antenna for diagnostic purposes. If
this error is excessive, it indicates external forces are acting on the antenna. These forces may be the
result of static imbalance, excessive bearing friction, cable binding, or wind loading.
To view the position error, select the REMOTE COMMAND window on the ACU by pressing the MODE
key several times. Key in "
.78 ENTER
" (note the decimal point). "x0000" should appear in the command
window. Press the MODE key once more to display the REMOTE MONITOR window. The lower display
will show "iv" and three 4 digit hex numbers. The numbers indicate Cross Level, Level and Azimuth errors
at a resolution of 1 part in 65536 or 0.0055 degrees. For example a display like "iv FFFF 0001 FFFD"
indicates the Cross Level error is -0.005 degrees, the Level error is + 0.005 degrees and the Azimuth error
is -0.016 degrees. The normal range of these numbers is FFF0 to 000F and they typically will bounce
around randomly within this range.
7.3.4. Reference Sensor Testing
To monitor the reference sensors, select the REMOTE COMMAND window on the ACU. Key in "
.118
ENTER
" (note the decimal point). "
v0000
" should appear in the command window. Press the MODE key
once more to display the REMOTE MONITOR window. The lower display will show "v" and three 4 digit
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