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Using the UPM LOAD OFF Pushbutton
4.4.8
NOTE: The UPM LOAD OFF pushbutton only controls the UPM on which Load Off
was activated and only interrupts the ability for that module to deliver power
to the critical bus. The redundant modules continue to support the critical
load. UPM can only be shutdown if remaining UPMs can support the critical
load without being overloaded. To remove all power from the critical load,
use the REMOTE EMERGENCY UPM OFF pushbutton.
A UPM Load Off is initiated by the red LOAD OFF pushbutton on the UPM Control
Panel. This pushbutton can be pressed to control the UPM output. The UPM
LOAD OFF pushbutton only powers down the UPM.
The UPM (including Bypass) remains off until restarted.
4.4.8.1
To Use the UPM LOAD OFF Pushbutton
1.
Press the LOAD OFF pushbutton.
The Unit Shutdown screen appears, providing a choice to proceed with the shutdown
or to abort the shutdown.
All output from this UPM to the critical load is lost when YES is selected in the following
step. You should use this feature only when you want to de-energize this UPM from
the critical load.
2.
To shut down the UPM, select YES from the Unit Shutdown menu, and hold for
two seconds. To abort the shutdown, select NO.
When YES is selected and held for two seconds, the input, output, battery and
bypass backfeed contactors open and the PPU is turned off.
Do not attempt to restart the system after Load Off until the cause of the
shutdown has been identified and cleared.
3.
To restart the UPM after pressing the LOAD OFF pushbutton, follow the
procedure in paragraph 4.4.6.
4--10
WARNING:
CAUTION:
Powerware BPIV Parallel Cabinet Installation and Operation
164201409 REV. B
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