Vertiv
|
NetSure™ 5100 Series -48 VDC Power System User Manual (UM582137200)
|
Rev. G
19
When setting total rectifier current limit, the set point to each rectifier is the total set point divided by the
number of rectifiers. 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 are removed or fails it will
take several seconds for the individual set points to the remaining rectifiers 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 should not be set such that the loss of the
redundant rectifiers 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 Controller 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 Controller 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.
Refer to the NCU Controller Instructions (UM1M830BNA) for a procedure to clear the alarm.
Replacement Information
Replacement Assemblies
When a trouble symptom is localized to a faulty rectifier, 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, controller, or circuit card.
Refer to System Application Guide SAG582137200 for replacement part numbers.
Replacement Procedures
DANGER!
Adhere to the “Important Safety Instructions” presented at the front of this document.
Replacing a Rectifier
Refer to the Rectifier Instructions (UM1R482000e3) for a rectifier replacement procedure. Refer also to
“System Troubleshooting Information” on page 18.
The rectifier being replaced is assigned by the NCU the lowest available identification number. If desired, you
can change the identification number, see “Configuring the NCU Identification of Rectifiers” in the separate
Power System Installation Manual (IM582137200).
Replacing the NCU Controller
Refer to the NCU Controller Instructions (UM1M830BNA) for a controller replacement procedure.