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UPS Operating Instructions
10-6
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual S 164201535 Rev C
10.1.9 Using the UPS LOAD OFF Pushbutton
AUPSLoadOffisinitiatedbytheLOAD OFF pushbutton from the main menu bar or the
System Controls menu bar. This pushbutton can be pressed to control the UPS output. The
UPS LOAD OFF pushbutton de-energizes the critical load and powers d own the UPS.
The UPS (including Bypass) remains off until restarted.
To use the LOAD OFF pushbutton:
1. Press the LOAD OFF pushbutton.
The Load Off screen appears, providing a choice to proceed or abort the
shutdown.
CAUTION
All power to the critical load is lost when the LOAD OFF is selected in the following step. You
should use this feature only when you want to de-energize the critical load.
2. To shut down the UPS, press LOAD OFF from the Load Off menu bar, and hold for
three seconds. To abort the shutdown, press CANCEL.
When LOAD OFF is selected and held for three seconds, the input, output, and
bypass backfeed contactors open, the battery breaker or disconnect is tripped,
and the power module is turned off.
CAUTION
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 UPS after pressing the LOAD OFF pushbutton, follow the procedure
in paragraph 10.1.1 or 10.1.2.