Xicom XTU-400K, Operation And Installation Manual

Page: 107 / 189

MNC-0400-001 47 of 54 Revision G
Operation, Rack and Digital HPAs
Note
Refer to the chapter titled Overview for general amplifier specifications
and the appendix Specifications for specifications that are specific to
your particular amplifier.
Operating Configurations
There are two operating configurations: LOCAL and REMOTE.
In LOCAL
, all operations are controlled from the TWTA Front
Panel. The controls and indicators were shown and summarized
at the beginning of this chapter. In REMOTE the front panel high
voltage and setup functions are inhibited.
Note
Familiarity with the XTRD menu system is required for LOCAL
operation. Familiarity with the XICOM command set is required for
REMOTE operation.
Operating Modes
The operating modes of the TWTA are described in the
following sections. There are four amplifier operating modes:
•
Filament Time Delay
•
Standby
•
Heater Standby
•
Beam ON
•
Fault
Filament Time Delay Mode (FTD)
When power is first applied to the amplifier, voltage is applied to
the TWT's filament. The TWT's filament must be at its operating
temperature for the tube to function properly. The typical warm-
up period is three minutes. During this warm-up period, the FTD
indicator (amber) will be illuminated. When the delay cycle is
complete, the FTD indicator will be dark.
If there is a power failure, high voltage will be OFF for a period
proportional to prime power off-time. At the end of the recovery
period, if high voltage is ON when the prime power interruption
occurs, high voltage is automatically restored