Digital Tracking Positioners
Description
|
AL-4048 Heavy Load High Preformance Tracking Pedestal |
Product Details
Data Takeoff Accuracy - the space difference between the
actual position (measured by optical device) and the position
displayed on controller screen (under no load).
Orthogonality Error - deviation of the elevation axis from true
perpendicularity with the azimuth axis.
Compliance - the inverse spring constant of a structure, bearing,
drive train, etc.; The compliance is used to determine both
mechanical resonant frequencies and angular errors introduced
by external torques.
Power Gearing Backlash - the free angular motion of the
output member with the input locked.
16. Definitions of applicable parameters are as follows:
15. Pedestal details, shown in the applicable drawings, are for
reference only and shall be specified for each order, separately.
14. A dry air-pressurizer unit, electrically operated, is available upon
request.
13. A Local Control Unit (LCU) is available as an option.
12. Electrical Power Requirements:
AC input voltage: 3 phase, 208V/60Hz or 380V/50Hz.
11. The base riser provides the necessary clearance for a 3-meter
antenna dish assembly.
10. This pedestal series include a standard elevation bracket. Special
side-arms, counterweights and antenna mounting tables can be
designed and provided according to specified user's requirements.
9. Standard environmental conditions:
Operating temperature -20oC to +50oC; relative humidity:
up to 95% including condensation;
withstands salt atmosphere in coastal regions;
withstands insects and fungi in tropical regions;
altitude range 0 to 10,000 ft.
Other environmental conditions are available according to specific
user's requirements.
8. Standard pedestal color is gloss-white. Other colors are available
as an option.
7. The stow provisions consist of manually-interlocked stow-lock pins
for azimuth and elevation axes. Elevation stowing at position 0o
is optionally available.
6. RF Rotary-Joint assemblies are available in azimuth and elevation
axes.
5. Slip-ring assembly enables continuous rotation for azimuth axis.
When Slip-Ring and Rotary-Joint are used, the limit switches are
disabled.
4. Models, which are equipped with electrical limit switches, are
adjustable to specified ranges.
For limited azimuth travel, a cable-wrap with sector switches is
available. Elevation axis uses shock absorbing mechanical stops as
a backup to the electrical limits.
3. Angular velocity and acceleration can be modified according to user's
requirement.
2. This data is for a dual-drive option on both axes. In addition to our
standard pedestals, special pedestals are available for applications
with unique requirements. The pedestals are designed for operation
with ORBIT antenna controllers, indoor AL-4726-3TC or outdoor
AL-5005-3T.
1. The pedestal is designed for high dynamic tracking and supported by
Computer Simulation programs, which enable ORBIT to predict, before
construction, the overall Pedestal System (Pedestal + Payload) static
and dynamic performance.
| ELEVATION | AZIMUTH | |||
| Bearing Moment Capacity (static) | lb.ft.(n.m) | 40,000(55,000) | 40,000(55,000) | |
| Maximum External PayLoad | lb. (kg) | 11,000 (5000) | ||
| Continuous Delivered Torque | lb.ft.(n.m) | 13,500(18,000) | 13,500(18,000) | See Note 1 |
| Peak Torque | lb.ft.(n.m) | 20,000(27,000) | 20,000(27,000) | See Note 1 |
|
Motor Type (with Integral Tacho and Fail-Safe Brake) |
DC Brushless | See Note 12 | ||
| Velocity | deg/sec. | 15 | 15 | See Note 2 |
| Peak Acceleration | deg/sec2 | 15 | 15 | See Note 2 |
| Power Gearing Backlash | deg. |
Zero with dual-drive torque BIAS or 0.05 |
||
| Data Take-off Accuracy | deg. Rms | 0.015 | 0.015 | See Note 6 |
| Axes Orthogonality | deg. |
AL-4048
Heavy Load High Preformance Tracking Pedestal
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