Vertiv | NetSure™ 8200 Series -48 VDC Power System User Manual (UM582140000) | Rev. A
NCU Battery Charge Current Limit Feature
Functionality: After a failure of the input source (commercial AC) or when some battery cells are permanently
damaged, the current to the batteries can be quite extensive. To avoid overheating or further damages to the
battery, the NCU can be programmed to limit the battery current to a preset level by limiting the charging
voltage of the rectifiers. Should the battery current still exceed a higher preset value, an alarm is issued.
In this system, the NCU Battery Charge Current Limit feature is set to be disabled. Refer to NCU controller
instructions (UM1M830BNA) to enable and program this feature, if desired. If enabled, battery charge current is
limited to the value set in the NCU controller, as long as battery voltage is above 47 VDC.
Local Controls and Indicators
Controller
Refer to NCU controller instructions (UM1M830BNA) for descriptions of the local controls and indicators
located on the NCU controller.
Bay LED Indicator
Located on the top front panel of each bay. See Figure 1, Figure 2, Figure 3, and Figure 4 for location. See
Table 2 for indicator function.
Table 2:
Bay LED Indicator
Indicator Description
Green (steady) Bay is 'OK'
Red (steady) 'Bay Failure'
Distribution Bus LED Indicator
Located next to each distribution bus (on the front of each distribution bus monitoring circuit card hinged
panel) in each bay. See Figure 1, Figure 3, and Figure 4 for location. See Table 3 for indicator function.
Table 3:
Distribution Bus LED Indicator
Indicator Description
Green (steady) Distribution Bus is 'OK'
Red (steady) 'Distribution Bus Failure'
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