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UM582127000 User Instructions
Issue AC, January 2, 2013 Spec. No. 582127000 (Model 721NPBB)
Page 10 Chapter 2. Operating Procedures
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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.
SM-DU Circuit Card
The SM-DU is used in supplemental bays in place of ACU+ controller. The SM-DU
monitors the bay and reports to the controller. The controller sends commands to the
SM-DU to fulfill battery management and load control functions according to the received
data.
There are three (3) status and alarm indicators located on the SM-DU. The functions of
these indicators (from top to bottom as shown in the illustration) are as shown in Table
2-1. Refer to Figure 2-6 for location.
Indicator
Normal State
Fault State
Fault Cause
Alarm
(Red)
Off
On
A critical or major alarm.
Alarm
(Yellow)
Off
On
A minor alarm.
Operation
(Green)
On
Off
SM-DU is non-operational.
Flashing
A 1/3Hz flashing indicates the SM-DU
is being identified by the Controller.
A 1Hz flashing indicates a
communication failure.
Table 2-1
SM-DU Indicators
Figure 2-6
SM-DU Circuit Card