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User Instructions UM1M820BNA
Spec No. 1M820BNA (Model M820B) Issue AH, March 4, 2013
Spec No. 1M820DNA (Model M820D)
Chapter 1. Introduction 9
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Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
1.3.7 Power Split Feature
The Power Split feature allows you to connect the power system controlled via the ACU+ to an existing DC
power system instead of extending or completely replacing the existing DC power system.
The power system controlled via the ACU+ functions as a slave system to share load (split output) with the
existing system (master system) that requires expansion. The ACU+ does not require communication with
the master system’s Controller.
The Power Split feature provides for the sharing of total load in a controlled manner between the
paralleled power systems.
When Power Split is programmed, the ACU+ adjusts rectifier output voltage per load demands to ensure
proper sharing between the slave and master power systems. See Figure 5.
Figure 5
Power Split Feature
1.3.8 Diesel Management Feature
The Diesel Management feature is available when an SM-AC supervisory module is connected to the
ACU+ Controller. The Diesel Management feature consists of a Diesel Test. The Diesel Test can be
performed at specific intervals or a User can manually start the Diesel Test. The ACU+ records the test
results.