Vertiv™ NetSure™ Control Unit (NCU) User Manual
Local Menu Navigation:
Main Menu / Settings Icon / Batt Settings / Batt1 Settings or Batt2 Settings / Rated Capacity.
Web Menu Navigation:
Settings Menu / Battery Tab / Batt1 Rated Capacity and Batt2 Rated Capacity.
or
See “Individual Battery Settings Page” on page 133.
2.9.29 Setting Rectifier High Voltage Shutdown
Local Menu Navigation:
None.
Web Menu Navigation:
Settings Menu / Rectifiers Tab / HVSD (set to enabled) then set HVSD Limit.
2.9.30 Setting Solar Converter High Voltage Shutdown
Local Menu Navigation:
None.
Web Menu Navigation:
Settings Menu / Solar Tab / HVSD Limit.
2.9.31 Setting Rectifier Current Limit
Local Menu Navigation:
Main Menu / Settings Icon / Rect Settings / Current Limit (set to enabled) then set Curr Limit Pt.
Web Menu Navigation:
Settings Menu / Rectifiers Tab / Current Limit (set to enabled) then set Current Limit Point.
2.9.32 Checking the Controller’s Current Limit Point after Adding or Removing a Rectifier
or Converter Module
If a rectifier or converter module is added; the respective current limit point in amps will automatically increase to maintain the same
percentage. For example, if the current limit was set to 100% of combined capacity and a module is added, the new current limit
setpoint will be 100% of the combined capacity including the new module.
If a rectifier or converter is removed from the system (and the Rect Comm Fail or Conv Comm Fail alarm is cleared); the respective
current limit point will remain unchanged unless the capacity of the remaining rectifiers or converters is not sufficient to maintain this
current limit point. If that happens, the current limit point will automatically decrease to the maximum (121% of the remaining rectifiers
or 116% of the remaining converters).
It is recommended that the current limit point be checked whenever a rectifier or converter module is added to or removed from the
power system.
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 fails, 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
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