SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 173 / 232

TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual
157
8.5.13 Azimuth Pot Calibration (6003L only)
Tools:
Flat-blade screwdriver
5/64 hex wrench for pot set screw
Part Location:
See Figures 8-10A and 8-10B, page 131.
Procedure:
1. Turn on the antenna and wait for initialization to complete.
2. Turn off torque to the motors by entering:
ac 1 n0000
3. Manually rotate the pedestal fully CCW until you hit the end stop.
4. Your relative azimuth should read 90 degrees (
ac 1 H
has reply 0900). If this needs to be adjusted,
loosen the set screws of the sprocket and turn the pot using the flat-blade screwdriver slot in the top of
the pot until the
ac 1 H
reply is 90 degrees (reply 0900).
5. Tighten the first set screw.
6. Rotate the pedestal fully CW until you hit the end stop. The relative azimuth reading (
ac 1 H)
reply
should be between 625 and 629 degrees (reply is 6250 to 6290). The pot is defective if the reading is out
of range.
7. Rotate the pedestal until the second set screw in the pot sprocket is visible. Tighten the second set screw.
8. Turn off power to the antenna.
9. Turn on power to the antenna.
10. After initialization is complete, move the antenna to 110 degrees relative:
ac 1 J1100
Then enter:
ac 1 J1000
Unwrap should occur to 100 + 360 = 460 degrees (
ac 1 H
= 4600).
11. Move to 605 degrees relative
ac 1 J6050
Then enter
ac 1 J6200
12. Unwrap should occur to 620-360 = 260 (
ac 1 H
= 2600).