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2 Introduction
2.1. General Information
DC Power Plants from APC have unique features that make them easy to install, maintain, and
upgrade. The rectifier units are modular and truly “hot-pluggable” into the shelf assembly
without any separate AC wiring. All system settings are made from the system control unit that
provides monitoring and control functions for each component of the system as well as alarm
listings for system diagnosis and maintenance.
The APC Model MX28B is a modular stand-alone -48V DC power plant. It is configurable in
such a manner that it will support most typical applications within the specified current ranges
(50-4800 amperes) without special application engineering or assistance. Distribution can be
included for a variety of circuit breakers or Telecom style fuses. These circuit breakers can be 1
to 700 amps. Fuses can be 70 to 600 amps. An optional low voltage disconnect (LVD) can be
provided on either the battery or the load side. A 1200 amp MX28B Rectifier Bay is shown in
Figure 2.2-1. A block diagram is shown in Figure 2.2-2.
2.2. How to Use This Manual
Each section of this manual can be read in any order and should provide a complete
explanation of the subject described by the title. However, the sequence of the sections is
designed to provide a typical step-by-step process for successful use of the equipment.