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UM1M820BNA User Instructions
Issue AH, March 4, 2013 Spec No. 1M820BNA (Model M820B)
Spec No. 1M820DNA (Model M820D)
78 Chapter 2. Operation
This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy
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.
3) Navigate to and set the “Test Volt Lmt” to the same value as the test voltage of the existing
power system.
4) Using the Web Interface (Maintenance / Edit PowerSplit), select the ACU+ digital input
connected to the existing systems battery test control circuit.
Note: Other settings in this menu regarding “Battery Test” are inactive.
Note: Battery test is controlled by the existing power system via an incoming digital signal. The
system will remain at battery test as long as this signal is active.
Low Voltage Disconnect Setup
If low voltage disconnect functions are to be used, they must be implemented in the existing power
system and signals from its control unit must be connected to the ACU+.
1) Using the Web Interface (Maintenance / Edit PowerSplit), select the ACU+ digital inputs
connected to the low voltage disconnect control circuits.
Temperature Compensated Battery Charge
There is no possibility to activate the “Temperature Compensated Battery Charge” function when
the ACU+ power system is configured for “Power Split” mode.
However, the possibility to change the “Delta Voltage” enables the ACU+ power system to follow
the existing power system that has the functionality to a certain limit.
Example: The “Delta Voltage” in the ACU+ power system is set to 1.0V. The existing power system
is set to compensate 3.0 mV/cell/°C. This means that the ACU+ power system can follow the
temperature compensation of the existing ;power system in the range of ±14°C from the set normal
battery temperature (3.0 mV x 24 cells x 14°C = 1.008 V).