Vertiv NetSure-48 VDC Installation And User Manual page 27

Configuring the NCU Identification of Rectifiers and Assigning which Input Feed is Connected to the
Rectifiers
When rectifiers are all installed prior to applying power and starting the system, the order in which the NCU identifies the rectifiers is
by serial number (lowest serial number is Rect 1, next lowest is Rect 2, etc.). If you prefer the NCU to identify the rectifiers by position
in the system, perform the following procedure.
Upon power up, the NCU arbitrarily assigns Feed AC1, AC2, or AC3 to each rectifier. This assignment is used to display rectifier AC
input feed voltage(s). The User may reassign the feed to each rectifier per your specific installation by following the procedure below.
Local Menu Navigation:
None.
Web Menu Navigation:
Refer to the NCU Instructions (UM1M830BNA) for detailed instructions.
NCU Alarm Relay Check
The following procedures can be used to verify operation of the external alarm relays in a power system equipped with an NCU with
the factory default configuration. Note that alarm relays on an NCU with a custom configuration may operate differently.
NOTE!
There are two methods to check alarm relays. The first is by actually causing an alarm. The second is by using the
NCU alarm relay check function. The first method is used in the following procedures. Refer to the NCU User Instructions
(UM1M830BNA) for instructions using the NCU alarm relay check function.
Checking the AC Fail Alarm
Procedure
NOTE!
Battery must be connected during this procedure.
1. Verify system is operating and no alarms are present.
2. Verify the NCU displays the Main Menu. If not, press ESC repeatedly to return to the Main Menu.
3. Open the external AC disconnect(s) or protective device(s) that supply power to all of the rectifier modules.
a) Requirement: An audible alarm sounds. Alarm will be silenced in Requirement d.
b) Requirement: On subject rectifier module(s), the "Protection" indicator goes from off to yellow. After approximately 30
seconds, the green "Power" and yellow "Protection" indicators go off.
c) Requirement: NCU "Critical/Major" alarm indicator goes from off to red.
Requirement: NCU displays "Rect AC Fail" alarm.
d)
To see the specific alarm(s), navigate to the Alarm Menu and press ENT. The Active Alarm screen lists two critical
alarms. "Power System CAN Comm Fail Critical" is displayed. Scroll down by pressing the down arrow key. "Rect
Mains Failure Critical" is displayed.
e) Requirement: External "AC Fail" (Relay 6) and "Critical" (Relay 1) alarms activate.
4. Return external AC disconnect(s) or protective device(s) to the ON position.
Requirement: "Power" indicator on subject rectifier modules goes from off to green.
a)
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