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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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
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.