Installation
4.4.1.3.3 POL Motor and 4th Axis Motor Phasing
1. Hold the POL switch to CW for a few seconds and then to CCW for a few
seconds. The CW drive command should result in clockwise rotation of the feed
assembly as viewed from the rear of the antenna structure; the CCW drive
command should result in counterclockwise rotation of the feed assembly as
viewed from the rear of the antenna structure.
2. If the drive command and axis rotation are correct, proceed to Section 4.4.1.4.
3. If the drive command and axis rotation are reversed, remove power from the
drive cabinet and switch the POL motor leads connected to terminals POL CW
and POL CCW located on TB1.
4. Restore power to the drive cabinet and recheck for proper POL rotation.
5. The 4-axis systems have a 4th Axis that is part of the feed assembly. Since
many different versions of the feed arrangement exist, additional information
will be supplied as needed.
4.4.1.4 Electrical Limit Switch Tests and Preliminary Settings
CAUTION
In the following steps, jog the antenna slowly as it nears each limit to
prevent possible damage to the antenna structure because of a
malfunctioning or improperly adjusted limit switch. This caution is
necessary only during installation in order to verify that the limit switches
are functioning correctly.
1. Using the PMCU hold the AZ AXIS CONTROL switch to the CW position. As
the antenna approaches the AZ CW limit, set the AZ SPEED ADJUST switch to
TRACK and drive the antenna into the AZ CW limit. Verify that the CW
movement of the antenna stops and that CCW motion is allowed. If CW and
CCW limits are operating backward, switch wires on TB1-1 and TB1-3.
2. Using the PMCU hold the AZ AXIS CONTROL switch in the CCW position and
drive the antenna into the AZ CCW limit. Verify that the CCW movement of the
antenna stops and that CW motion is allowed.
3. Using the PMCU hold the EL AXIS CONTROL switch in the UP position and
drive the antenna into the EL UP limit. Verify that the upward movement of the
antenna stops and that downward motion is allowed.
4-31
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