Operation
2. On the 7150 Drive Cabinet, set the following controls as indicated:
a. Set the Main Circuit Breaker to ON
b. Set all remaining Circuit Breakers to ON
c. Set MAINT/REMOTE switch to MAINT
3. On the 7200 ACU back panel, set the on/off switch to the on position.
5.7 Manual Movement of the Antenna
5.7.1 Manual Movement From the Drive Cabinet (PMCU)
Manual control of each axis is provided at the drive cabinet by using the PMCU,
primarily to facilitate antenna maintenance. A MAINT/REMOTE switch (CONTROL)
located on the Relay PCB. It is the only selection point for maintenance mode.
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 drive cabinet switches are inoperative.
To operate the antenna from the drive cabinet, use the following procedures.
1. On the drive cabinet, set the CONTROL switch to MAINT to enable the controls
on the PMCU.
2. Set the AZ SPEED ADJUST to TRACK. The slew and tracking speed parameters
are set in the drives. (SLEW is a fast speed. TRACK is a slow speed.)
3. Hold the momentary AZ AXIS CONTROL to the CW or CCW position. Holding
the switch at CW results in clockwise motion of the antenna as observed from
the rear of the antenna. Holding the switch at CCW results in counterclockwise
motion of the antenna. When released, the switch automatically returns to the
center (off) position.
4. Set the EL SPEED ADJUST to TRACK. The slew and tracking speed parameters
are set in the drives.
5. Hold the momentary EL AXIS CONTROL switch to the UP or DOWN position.
Holding the switch at UP results in upward motion of the antenna and holding
the switch at DOWN results in downward motion of the antenna. When
released, the switch automatically returns to the center (off) position.
6. Hold the momentary POL switch to the CW or CCW position. Holding the
switch at CW causes the feed assembly to rotate CW as observed from the rear
of the antenna and holding the switch at CCW causes the feed assembly to
rotate CCW. When released, the switch automatically returns to the center (off)
position.
5-7
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