Overview
A VME backpanel PCB serves as the bus interface and DC power supply
distribution system for the CPU and RDC PCB’s. Two of the four slots are available
for future expansion and/or customized features and factory options.
A PCB mounted to the ACU rear panel accepts all external wiring and connectors
(with the exception of the line cord) and serves as a “break-out” device with
connections to each of the circuit boards in the card cage.
Two cooling fans are provided to ensure operation of the ACU internal components
remain well within device ratings. The fans are powered from the +24 V output of
the power supply.
2.4.1.10 Power Supply, EMI Filter and Fuse
Power for all ACU components is provided by one power supply assembly, which
is mounted to the bottom plate of the chassis. This power supply is a quad
output, switched mode type, providing output voltages of +5, ±12 and +24 VDC
for all logic and control circuits. Nominal power requirements for the ACU are 75
VA at 100 to 240 VAC, 50 or 60 Hertz (Hz).
The power supply used in the 7200 ACU has an automatic shutdown feature in
case over-current conditions occur. The system also has a line fuse on the rear
power entry module in case of a ground fault. An input line-conditioning filter
provides Electromagnetic Interference (EMI) suppression.
TABLE 2-8 7200 POWER INPUT SPECIFICATIONS
Input Voltage Range 100 to 240 VAC Nominal
Input Power Requirements 75 VA Typical
Input Surge Current 25 Amps Max. @ 25 degrees C
Input Power Factor 0.98 Typical (Active Power Factor Corrected Supply)
Input Frequency Range 50 to 60 Hz Nominal (47-63 Hz Max.)
Fuse Current Rating 2 Amps
Fuse Type 5 x 20 mm Time Lag Fuse (Slo-Blo Type Fuse) per IEC 60127-2 Sheet 3
Specifications subject to change without notice.
2.4.2 Antenna Drive Cabinet Hardware
The standard motor drive cabinet is a freestanding, foot-mounted aluminum NEMA-
4X enclosure with overall dimensions of approximately 36-inches tall by 30-inches
wide by 10-inches deep (91.4 cm tall by 76.2 cm wide by 25.4 cm deep). The
aluminum cabinet provides outstanding corrosion protection even in the harshest of
environments. The cabinet weighs approximately 150 lbs. (68 kg) and is
operational in altitudes of up to 10,000 ft. (3,048 m). The input power to the
cabinet can vary according to the particular drive cabinet that was ordered with
your system; please see the specific system documentation for more information.
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