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MX28B400 +24 VDC User’s Manual Page 2
2 Introduction
2.1. General Information
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 + 24 Vdc power plant. It is configurable in
such a manner that it will support most typical applications within the specified current ranges
(400 amperes) without special application engineering or assistance. Distribution is included for
up to 24 plug-in circuit breakers. These circuit breakers can be 1 to 100 amps, with 60-100 amp
breakers requiring two positions and a circuit breaker adapter kit. An optional low voltage
disconnect (LVD) can be provided on either the battery or the load side. An MX28B is shown in
Figure 2.1-1. A system wiring diagram is shown in Figure 2.1-2.
Figure 2.1-1 MX28B-400 +24 Vdc Power Plant (with circuit breaker cover removed)