SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 111 / 232

TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual
95
7.2.4.2 Tracking Positioner (cont.)
CONDITION TEST CAUSE ACTION
Azimuth reference
error
ac 1 st
Antenna type in PCU is
incorrect. Enter antenna type n0xxx, {8.5.1}
See Table 8-1, page 142.
Azimuth torque error.
ac 1 st
Cable is caught.
Gain is too high.
Re-dress cables.
Check torque settings, Table 8-1.
Elevation torque error
and see 7.2.4.3 -
Elevation Torque Test.
ac 1 st
Cable is caught.
Gain is too high.
Antenna is out of balance
(front to back).
Re-dress cables.
Check torque settings, Table 8-1.
Rebalance antenna {8.5.1}.
Cross-level torque
error.
ac 1 st
Cable is caught.
Gain is too high.
Antenna out of balance
(left to right).
Re-dress cables.
Check torque settings, Table 8-1.
Rebalance antenna {8.5.1}.
Antenna does not
move in response to
an
ELEVATION
drive command.
ac 1 el 90.0
ac 1 pos
ac 1 el 0.0
ac 0 pos
A pin is pushed in on the
pedestal harness at PCU
connector.
PCU is faulty.
Pull the pin back out, realign it,
and reset the connector.
Replace PCU {8.4.1}.
Bad elevation motor. Replace elevation motor {8.4.2}.
Bad servo amplifier. Replace servo amplifier {8.4.3}.
Bad harness,
PCU to servo. Replace pedestal harness.
Level platform stepper
motor belt is too tight. Adjust belt {8.4.34, Step 5}.
Level platform assembly
does not rotate freely on
cross-level beam. Loosen nut (drawing 70918004,
page 53) on level platform
assembly.
Bad harness. Replace pedestal harness.
Replace motor harness
(6003AL only).