Vertiv | NetSure™ 8200 Series -48 VDC Power System Installation Manual (IM582140000) | Rev. A
Verifying and Setting the NCU Controller as Required for Your Application
General
You can verify and set the NCU controller as required for your application using the NCU local display and
keypad or via the front panel touch screen. The NCU is located inside the primary power/distribution bay or
primary power only bay. The front panel touch screen is located on the outside of the primary
power/distribution bay or primary power only bay front door. Use the touch screen to easily access the NCU
webpages. You can also use the NCU Start Wizard from the NCU local display and keypad.
Refer to the NCU instructions (UM1M830BNA) for additional information.
Note that you will have to program the NCU for any temperature probes and external inputs/outputs connected
to the IB2 Interface Board, EIB Extended Interface Board, and SM-DUE.
Temperature Probes: Depending on if NCU temperature probe inputs are enabled or disabled in the NCU
configuration, you may have to program the NCU for any temperature probes being used. Note that some
temperature probe inputs may not be enabled by default. Refer to the C-drawing supplied with your system to
determine if temperature probe inputs are enabled and pre-programmed. Refer to “Setting Temperature
Sensors” in the “Common Tasks Performed via the Local Keypad and/or Web Interface” section of the NCU
controller manual (UM1M830BNA) if temperature probe inputs require programming.
NOTE!
When setting total rectifier 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 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.
Using the NCU Local Display and Keypad
Procedure
1. From the Main Menu (see Figure 111), press the UP and DOWN keys to highlight the desired Menu
graphic in the Main Menu. Press the ENT key to enter the selected menu.
NOTE!
Repeatedly press the “ESC” key to return in reverse order level by level from any submenu until
the Main Menu appears.
2. Verify and set the NCU controller as required for your application.
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