COBHAM Sea Tel 9711-56 IMA C Band, Руководство по установке

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Maintenance Sea Tel 9711-56 IMA
17-12
EAR Controlled - ECCN EAR99
17.4. Balancing the Antenna
The antenna and equipment frame are balanced at the factory however, after disassembly for shipping or
maintenance, balance adjustment may be necessary. The elevation and cross-level motors have a brake
mechanism built into them, therefore, power must be ON to release the brakes and
DishScan® and antenna
drive must be OFF to balance the antenna. . Do NOT remove any of the drive belts. Balancing is
accomplished by adding or removing balance trim weights at strategic locations to keep the antenna from
falling forward/backward or side to side. The antenna system is not pendulous so 'balanced' is defined as the
antenna remaining at rest when left in any position.
The “
Balance Mode ” selection located on the upper part of the “ Four Quadrant Test ” screen in the Tools –
Test menu page. When enabled, Balance Mode temporarily turns DishScan®, Azimuth, Elevation and Cross-
Level drive OFF. This function is required when trying to balance this antenna system.
Assure that Antenna power is ON and that the antenna has completed initialization.
At the Computer (connected to the MXP):
1. Log into the GUI, select Tools - Test in the side bar menus.
2. Select “ Balance Mode ” (located on the upper part of the “ Four Quadrant Test ” screen, just below
the page header) to enable balance mode. The screen will then show ON & OFF buttons.
3. Click ON. The screen will temporarily display “Submitting … Please Wait”. When this message
disappears the antenna is in balance mode. DO NOT EXIT THIS SCREEN.
At the Antenna:
4. At the Antenna: Balance the antenna with the elevation near horizon (referred to as front to back
balance)
by adding, or subtracting, small counter-weights .
5. Then balance Cross Level axis (referred to as left-right balance) by moving existing counter-weights
from the left to the right or from the right to the left . Always move weight from one location on
the equipment frame to the same location on the opposite side of the equipment frame (ie from the
top left of the reflector mounting frame to the top right of the reflector mounting frame). Do NOT
add counter-weight during this step.
6. Last, balance the antenna with the elevation pointed at, or near, zenith (referred to as top to bottom
balance)
by moving existing counter-weights from the top to the bottom or from the bottom to
the top . Always move weight from one location on the equipment frame to the same location on the
opposite side of the equipment frame (ie from the top left of the reflector mounting frame to the
bottom left of the reflector mounting frame). Do NOT add counter-weight during this step.
7. When completed, the antenna will stay at any position it is pointed in for at least 5 minutes (with no
ship motion).
8. Do NOT cycle antenna power to re-Initialize the antenna. Return to the Computer (MXP), which is
still in Balance Mode. Click OFF. The screen will temporarily display “Submitting … Please Wait”.
When this message disappears the antenna is in normal operation mode. When you exit Balance
Mode the antenna will return to normal (DishScan®, Azimuth, Elevation and Cross-Level drive ON).