Eaton Powerware 9390-160/100 Installation And Operation Manual page 137

10.2.8 Using the UPS LOAD OFF Pushbutton
A UPS Load Off is initiated by the LOAD OFF pushbutton from the main menu bar or the
System Controls menu bar. The UPS LOAD OFF pushbutton de-energizes the critical load
and powers down the UPS.
The UPS (including Bypass) remains off until restarted.
To use the LOAD OFF pushbutton:
EATON Powerware 9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.com
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7. To shut down the last UPM, press the REPO pushbutton switch. See "Using the
Parallel System Remote Emergency Power-off Switch" in paragraph 10.2.9.
The input, output, and bypass backfeed contactors open, the battery breaker or
disconnect is tripped, and the power module is turned off immediately, without
asking for verification.
8. Open all UPM input and bypass (if dual feed) feeder circuit breakers.
The parallel system and critical load is now de-energized.
9. To restart the parallel system after using the REPO pushbutton, reset the REPO
switch and then follow the procedure in paragraph 10.2.1 or 10.2.2.
The UPM LOAD OFF pushbutton controls only the UPM on which Load Off was
NOTE
activated and only interrupts the ability of that module to deliver power to the critical
bus. The redundant modules continue to support the critical load. The UPM can be shut
down only if the remaining UPMs can support the critical load without being
overloaded. To remove all power from the critical load, use the REPO pushbutton.
1. Press the LOAD OFF pushbutton.
The Load Off screen appears, providing a choice to proceed or abort the
shutdown.
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.
UPS Operating Instructions
C A U T I O N
10-13