When
an AIU is used with an antenna equipped with 230-volt AC three-phase
motors, an auxiliary motor drive unit is required.
CTI offers a Variable
Speed Motor Controller (VSMC) for this purpose.
It can be used on new antennas, or as a replacement for an
existing outdoor contactor assembly on an older antenna.
The
VSMC provides precise control over the position, speed, and acceleration
of the antenna drive motors:
·
When a motor is started, the VSMC "ramps" it
from 0% to running speed during a user-specified time interval.
·
Two running speeds are available.
The slow speed is used for precise positioning; the fast speed
quickly moves the antenna across the satellite arc to a new position.
The VSMC
is available in two optional configurations:
·
Model VSMC-1 for a single-axis antenna (polar mount
without declination adjustment).
·
Model VSMC-2 for a dual-axis antenna (AZ/EL mount or polar
mount with declination adjustment).
The
VSMC is used in conjunction with an Antenna
Interface Unit (AIU):
The
AIU is connected to the Control Unit over a cable called the
"AIU Serial Link" or ASL. The standard ASL consists of a
single run of coaxial cable. Up
to four AIUs can be connected to a Model CTI-854 Control Unit over
separate ASLs. On special
order, interfaces for RS-232 links, RS-422 links, or fiber-optic links
can be provided.
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