NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000 Code: UM582127000
Model No: 721NPBB Issue AD, January 20, 2014
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 1. Refer to Figure 6 for location.
Table 1. SM-DU Indicators
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.
Figure 6. SM-DU Circuit Card
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