Vertiv™ NetSure™ 512
NGBB
-48 VDC Power System User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
24
When setting total rectifier or total converter current limit, the set point to each unit is the total set point divided by the number of
units. For example, if the system contains five rectifiers and the current limit is set to 150 amps then each rectifier has a current limit
set point of 30 amps. If one or more rectifiers or converters are removed or fail it will take several seconds for the individual set points
to the remaining rectifiers or converters to be reset. In the example given, if one rectifier is removed the current limit set point will
drop to 120 amps (30 amps times four remaining rectifiers) until the controller can send updated set points to the remaining rectifiers.
This takes a couple communication cycles (several seconds) after which each rectifier would have a new set point of 37.5 amps for a
total of 150 amps. The total current limit of the rectifiers and converters should not be set such that the loss of the redundant
rectifiers or converters will cause this temporary set point to drop below the actual maximum expected load. If batteries are used on
the rectifier output, the batteries should support the load until the current limit set points can be re-established due to loss of a
rectifier.
Refer to the NCU Instructions (UM1M830BNA) for a procedure.
Clearing a Rectifier Communications Fail Alarm after Removing a Rectifier
If a rectifier module is removed from the system, a rectifier communications failure alarm is generated. If the rectifier module will not
be replaced, the alarm should be cleared.
Refer to the NCU Instructions (UM1M830BNA) for a procedure.
Clearing a Converter Communications Fail Alarm after Removing a Converter
If a converter module is removed from the system, a converter communications failure alarm is generated. If the converter module will
not be replaced, the alarm should be cleared.
Refer to NCU Instructions (UM1M830BNA) for a procedure.
Clearing a Rectifier Lost Alarm
If the controller resets while a rectifier communications fail alarm is active, the rectifier communications fail alarm is replaced with a
rectifier lost alarm. The alarm should be cleared.
Refer to the NCU Instructions (UM1M830BNA) for a procedure to clear the alarm.
Clearing a Converter Lost Alarm
If the controller resets while a converter communications fail alarm is active, the converter communications fail alarm is replaced with
a converter lost alarm. The alarm should be cleared.
Refer to the NCU Instructions (UM1M830BNA) for a procedure to clear the alarm.
4.5
Replacement Information
Replacement Assemblies
When a trouble symptom is localized to a faulty rectifier module, converter module, controller, or system circuit card; that particular
device or circuit card should be replaced in its entirety. No attempt should be made to troubleshoot or repair individual components
on any rectifier module, converter module, controller, or circuit card.
Refer to SAG582137000 (System Application Guide) for replacement part numbers.