Step 5
Step 6
Step 7
Step 8
Pedestal Mount
Bearing Pad
Adjustment
Step 1
Step 2
Step 3
Step 4
Step 5
78
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.
Preventive Maintenance
