Emerson Battery Asymmetry Unit Data Sheet
Battery Asymmetry Unit (BAU)
DC Power for
Business-Critical Continuity™
Battery Monitoring,
BAU48/4
Features and Benefits
Small size box – Simple installation and
add on to Controller function
Easy-to-use and easy-to-wire
Controls up to 4 battery strings
Description
BAU 48/4 detects battery backup system failures by comparing the total and the
central point voltages in battery strings. Battery cell failures, open circuit or short
circuit failures causes voltage changes that activate a preset voltage difference alarm.
The unit can be connected to Emerson Network Power Controllers (SCU, SCU+, ACU,
ACU+).
Battery Asymmetry Unit (BAU)
Battery Asymmetry Unit
Powe Battery Midpoint Alarm Output
+ - 1 2 3 4
Power System
battery string 1
battery string 2
battery string 3
battery string 4
BAT-
BAT-
BAT-
BAT-
BAT+
BAT+
BAT+
BAT+
cable fuse 1
cable fuse 2
cable fuse 3
cable fuse 4
Technical Specifications, BAU48/4
Inputs
Power Supply 40 to 60 VDC, <25 mA
Battery Input Voltage Measurement 4 inputs, 0 to 60 VDC
Alarm Output
Relay NO or NC
Relay Capacity Max Power: 60 W
Max Voltage: 60 VDC
Max Current: 2 A
Control and monitoring
LED Green - Power ON
Red - Fault
Alarm Set Points
Alarm Threshold Settings +/- 2.0 VDC
+/-1.75 VDC
+/-1.5 VDC
+/-1.0 VDC
+/-0.5 VDC
DC Power for
Business-Critical Continuity™
Mechanical and Environmental Parameters
Dimensions (H × W × D) 23 × 98 × 76mm or 0.9 × 3.9 × 3.0 Inch
Weight 0.2kg (0.4lbs)
Operating Temperature Range -10℃ to 50℃ (-14℉ to 122℉)
Relative Humidity 95%
Accessories 4 battery fuses, 5A
Ordering Information
Product Name BAU48/4
Emerson Network Power.
The global leader in enabling
Business-Critical Continuity™
Emerson Network Power
www.emersonnetworkpower.com
www.emersonenergy.com (Energy Systems, Europe)
www.emersonnetworkpower.com/energysystems
(Energy Systems, North America)
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and service marks of Emerson Electric Co.
©2008 Emerson Electric Co.
2008.11
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