ATLAS 5 of 44 User’s Manual
1. INTRODUCTION
The ATLAS is a modular switch mode (high frequency) battery charger / power supply platform designed for
railroad signal and communication, as well as other industrial stationary / reserve power applications.
ATLAS is convection cooled with no fans or other moving parts and designed to provide maximum reliability in
industrial environments. The modular architecture provides redundancy and maximizes uptime, and the
system controller combines the simplicity of rotary switches to adjust the float voltage with sophisticated
communication, alarming, and logging options. The universal AC input enables the charger to be used with a
wide range of AC voltages and frequencies, and the system features high energy efficiency and power factor.
As is illustrated in Figure 1-1, an ATLAS system includes a chassis. The chassis has a User Interface Module
(UIM) that serves as the system controller and user interface and an access panel for the AC input and DC
output terminals. Chassis are available with four (4) or two (2) slots for Intelligent Power Modules (iPMs).
Figure 1-1: ATLAS System Components
Both 12 Vdc, 400W, 20A and 24 Vdc, 400W, 10A iPMs are available. Figure 1-2 shows the corresponding
maximum system DC output current for a given number of iPMs. An ATLAS system can be set to charge
batteries within a voltage range of 1.00 to 20.00 volts (12 Vdc nominal system) or 10.00 to 40.00 volts (24 Vdc
nominal system) for nickel-cadmium (Ni-Cd), valve regulated lead-acid (VRLA), and flooded/vented lead-acid
batteries. The values shown throughout this manual in the instruction tables and figures are for generic use
and may be different from the actual values programmed in your unit. Customized settings are available,
contact a Lester Electrical service agent at 1-402-477-8988.
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