Vertiv
|
NetSure 502NGFB Installation Manual (Section 6009)
|
Rev. Z
64
NOTE!
The following procedure is to be used only with circuit breakers that provide an alarm indication
when manually placed to the OFF (open) position (black handle). Electrical trip alarm circuit breakers
(white handle) cannot be easily tested in the field.
4.
Do one of the following: (1) Remove a good fuse or a dummy fuse from a GMT fuse position, and replace
it with a blown fuse, or (2) Place the handle (if black) of a load circuit breaker in the OFF (open) position.
a)
Requirement:
An audible alarm sounds. The alarm will be silenced in Requirement c.
b)
Requirement:
NCU “Critical/Major” alarm indicator goes from off to red.
c)
Requirement:
NCU displays “Alarm”.
To see the specific alarm(s), navigate to the Alarm Menu and press ENT. The Active Alarm screen
lists one critical alarm. “Power System Load Fuse Brkr Critical” is displayed.
d)
Requirement:
External “Fuse/Circuit Breaker Alarm” (Relay 7) and “Critical” (Relay 1) alarms
activate.
5.
Do one of the following: (1) Replace the blown GMT fuse with a known good fuse (or a dummy fuse), or
(2) place the handle of the circuit breaker in the ON (closed) position.
a)
Requirement:
NCU “Critical/Major” alarm indicator goes from red to off.
b)
Requirement:
Press ESC repeatedly to return to the Main screen. NCU displays “No Alarm”.
c)
Requirement:
All external alarms deactivate.
Final Steps
1.
If any NCU Controller configuration settings were changed, refer to the NCU User Instructions
(UM1M820BNA) and save a copy of the configuration file. This file can be used to restore the NCU
Controller settings, if required, at a later date.
2.
Verify the Distribution Unit door is closed and secured.
3.
Verify all Rectifier Modules and the Controller are fully seated, latched, and the latch handle screws
secured.
4.
Verify there are no external alarms, and the local indicators are as shown in
