CPI VZU-6994, Руководство пользователя

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EQUIPMENT DESCRIPTION
General
The VZU-6994 CMPA (Figure 1) is packaged in a 5.25 inch tall slide-mounted drawer
suitable for standard 19-inch rack mounting. This enclosed assembly houses both the RF
and power supply sections of the amplifier. The RF section includes the TWT, solid state
intermediate power amplifier (IPA), input/output isolation circuits, input attenuator, RF
detectors and output harmonic filter. The power supply section includes the power factor
correction, power processor, and high voltage regulation circuitry. It also contains all
monitor, control and protection circuits necessary to permit safe, efficient and reliable
operation of the CMPA.
The VZU-6994 CMPA is protected from operational damage caused by abnormal AC,
DC, RF faults or insufficient cooling. The amplifier will automatically recycle itself after
a prime power interruption or transient fault condition.
Personnel safety is of utmost importance and is safeguarded by proper grounding and by
access interlocks and shields, which prevent physical entry into the high voltage sections.
The front panel of the unit serves as the primary user interface housing all monitor and
control functions including a type N RF connector to sample and measure output RF
power. Opening the small access door on the front panel allows easy access to
configuration DIP switches that can be set during installation, up/down buttons that
permit setting high and low alarm trip points (such as Low RF), and a set of detail fault
LEDs to help troubleshoot during operation.
Principal functions are also brought to the five user-interface connectors located on the
rear panel for remote monitor and control. Control, fault and monitoring functions are
available via: the RS-422/485 computer interface (CIF) designed to interface directly
with a computer; a second RS-422/485 port to be used when the optional CPI remote
control panel is purchased; a more basic analog command/status port designed for users
who will not be operating remotely via a computer; a separate switching port for use with
switching/power combining subsystems; and a user interlock port for use when
interfacing other equipment or controls with the CMPA.
Digital attenuation is available which allows for RF drive attenuation adjustment via the
serial remote interface ports, thereby enhancing remote monitor and control capabilities.
To expedite field maintenance procedures, the VZU-6994 TWTA utilizes a modular
design approach consisting of Line Replaceable Units (LRUs), which permit service
personnel to maintain the CMPA in the field without need of returning the entire unit to
the depot or factory. Comprehensive built-in-test (BIT) sequences and diagnostic
procedures allow field personnel to localize the fault to the individual LRU, make the
necessary replacement and return the amplifier to service with a minimum of operational
downtime.
Ku-Band CMPA 04/08 TD-67 Page 2