User's Manual

Chapter 2 System Description
2.3.15.4 High Power Amplifier Power Supply Unit (HPA PSU)
The HPA PSU is a high perf
ormance, modular power supply system, which provides the HPA’s
with the necessary voltage and current to operate at the required output power level.
The HPA sub-system employs four (4) power supply mounting shelves, each containing two
(2) identical rectifier modules. The rectifiers operate independent of each other; each
rectifier module is dedicated to power a specific HPA.
The rectifier modules are high efficiency (better than 90%) air cooled units with a typical
power factor of 0.98. The modules are fed from separate two-pole, 15A circuit breakers in
the PDU via the mounting shelf. The modules are connected to the corresponding HB or LB
HPA via the mounting shelf to provide the HPA with necessary 30 VDC (with a maximum
current of 60 A).
Each rectifier module is connected to the corresponding HPA via a RS-485 serial interface on
the mounting shelf, allowing the rectifier module to communicate with the HPA controller
using the built in Galaxy protocol. The HPA controller is able to monitor the status of the
rectifier module as well as enable or disable the rectifier module’s DC output.
Figure 2-30 HPA PSU with Rectifier
SX03-30000-01-M01
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