Overview
2.8.1 Manual Antenna Control from the Drive Cabinet
Manual control of each axis is provided at the drive cabinet using the PMCU,
primarily to facilitate antenna maintenance. Setting the MAINT/REMOTE switch
located on the Relay PCB panel to MAINT mode transfers control of the system to
the PMCU, allowing maintenance to be performed on the system.
Therefore, with this switch in the MAINT position, the ACU cannot assume control.
With the switch in the REMOTE position, the ACU has control of the system and the
PMCU is inoperative.
2.8.2 Manual Antenna Control from the Antenna Control Unit
Real-time manual jog control is provided at the ACU by dedicated keys on the keypad
(one key for each direction of travel), which are activated by selecting Manual
antenna control from the ACU Tracking Functions menu (refer to Section 5.8.2.5).
For the AZ and EL axes, pressing the jog keys results in corresponding low-speed
motion of the antenna. Pressing the jog keys while pressing the [SHIFT] key results
in high-speed antenna motion. POL jog control (3-axis systems) is single-speed only.
4TH AXIS jog control (optional 4-axis systems) is also single-speed.
2.9 Immediate Tracking
Immediate tracking is the quickest method to begin tracking. Since it requires very
little configuration, this method of tracking is useful for testing and moving the
antenna to seldom used locations. The 7200 ACU provides immediate tracking
modes as described in the following sections. These tracking modes are accessed
from the Main menu by selecting Tracking functions..., Immediate tracking…. For
more information on these tracking modes, refer to Section 5.8.2.4.
2.9.1 Move to Longitude
This mode is identical to Move to look angles, except that the user enters a longitude
on the geostationary arc instead of AZ and EL coordinates. The ACU computes the
AZ and EL coordinates from the given longitude. (Refer to Section 5.8.2.6.3.4.)
2.9.2 Move to Look Angles
In this mode of operation, the system moves the antenna to a preprogrammed set of
AZ, EL, and POL(s) coordinates (look angles), then actively maintains the antenna at
that position. During the operation, the antenna is moved at slew (fast) speed until
relatively close to the target, and then automatically switches to track (slow) speed
for precise positioning. Positioning is complete when the axis position feedback
reflects antenna positioning to within a user-definable deadband around the target
angles. (Refer to Section 5.8.2.6.3.5.)
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