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7 7 . . 5 5 . . 6 6 S S i i n n g g l l e e U U P P S S S S h h u u t t d d o o w w n n u u s s i i n n g g L L o o a a d d O O f f f f
NOTE
To shut down a single UPS, MOBs with dual auxiliary contacts must be installed and
connected according to the procedure in paragraph .
To shut down a single UPS:
1.
Open the MOB for the UPS being shut down.
2.
On the UPS to shut down, press the CONTROLS pushbutton on the main menu bar. The System Status
screen is displayed.
3.
On the System Status screen, select the BYPASS command.
4.
Press the CONTROLS pushbutton on the System Status menu bar. The Bypass Control Command screen
is displayed.
5.
On the Bypass Control Command screen, select GO TO BYPASS.
6.
Press the SELECT pushbutton on the Bypass Command menu bar.
The UPS being shut down transfers to Bypass mode.
The BYPASS status indicator is illuminated. The Bypass status indicates ON. The UPM status indicates
READY. The power module remains on.
NOTE
Load Off will turn off only the UPS being shut down. The remaining UPSs will remain
online supplying power to the critical load.
7.
Perform the LOAD OFF procedure in paragraph
or paragraph on the UPS being shut down.
The input, output, battery, and bypass backfeed contactors open, and the power module is turned off on
the UPS being shut down.
Logic power remains on.
8.
Verify the battery breaker or disconnect for the UPS being shut down is open. If not, open the breaker.
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is opened.
NOTE
If the UPS contains an input breaker (CB1), DO NOT open the breaker unless no input
feeder breaker is installed.
9.
Open the input and bypass feeder circuit breakers for the UPS being shut down.
The UPS is now completely shut down.
External Communications Failure alarm is active on remaining online UPSs. This is an expected event and
will clear upon UPS restart.
7 7 . . 5 5 . . 7 7 S S i i n n g g l l e e U U P P S S S S h h u u t t d d o o w w n n u u s s i i n n g g U U P P M M S S h h u u t t d d o o w w n n
NOTE
To shut down a single UPS, MOBs with dual auxiliary contacts must be installed and
connected.
To shut down a single UPS:
7.5.11 Using the UPS LOAD OFF Pushbutton or Command
Eaton
®
Power Xpert
®
9395P-1200 Installation and Operation Manual 164000500—Rev 11
UPS Operating Instructions
171
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