Andrew ES45T manual Step Pedestal Mount Bearing Pad Adjustment

Step 5

Step 6

Step 7

Step 8

Pedestal Mount

Bearing Pad

Adjustment

Step 1

Step 2

Step 3

Step 4

Step 5

Turn the ELEVATION DOWN/UP switch to either position and while the antenna is rotat- ing, carefully use a clamp-on ammeter in accordance with the ammeter manufacturer’s instructions to take current readings off each of the power conductors (phases) connect- ed to the main terminal block at the bottom of the panel. Record the current draw in the equipment log and compare the readings to the reference values entered in the installa- tion/acceptance check-off. If the readings differ significantly, refer to the appropriate troubleshooting information and perform the applicable corrective action. Then take volt- age readings off each of the three conductors; the readings should agree with each other - within two percent. Turn the ELEVATION switch to OFF.

Repeat the preceding step (5) with the ELEVATION DOWN/UP switch in the alternate operating position.

Repeat steps 3 through 6 with the Az/El speed in the SLOW position.

If all voltage and current readings are within tolerance, turn the primary power discon- nect switch OFF. Then close and lock the outer local motor controller door. Disconnect the hand held controller to return antenna control to studio.

The bearing pad (within the pedestal mount) adjustment rods/bolts require yearly adjust- ment and verification of torque value. With the antenna at zenith (90 degrees), follow the procedures presented below:

Loosen jam nuts on all rods/bolts.

Torque the upper adjustment rod evenly to 40-45 foot-pounds. Then torque the lower adjustment rod evenly to 40-45 foot-pounds.

Torque the upper adjustment bolt evenly to 40-45 foot-pounds. Then torque the lower adjustment bolt evenly to 40-45 foot-pounds.

Repeat steps 2 and 3 verifying all adjustment rods/bolts are evenly torqued within the limits specified.

Tighten the jam nuts.

78 Preventive Maintenance