UPS Operating Instructions
9-5
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual
S
164201535 Rev A
9.7 UPS and Critical Load Shutdown
To perform maintenance or service on the critical load, shut down power to the load by
performing the following procedure:
1.
Turn off all equipment that is being powered by the UPS.
2.
Perform the LOAD OFF procedure contained in paragraph 9.9.
The input, output, and bypass backfeed contactors open, the battery breaker or
disconnect is tripped, and the Power Module is turned off.
W A R N I N G
Power is present inside the UPS cabinet, until the upstream input feeder circuit breaker is
opened.
3.
Open the UPS input and bypass (if dual feed) feeder circuit breakers.
9.8 Charger Control
To turn the battery charger on or off, perform the following procedure:
1.
Press the
CONTROLS
pushbutton on the Main menu bar. The System Control
screen appears.
2.
Press the
pushbutton to display System Controls Screen 2.
3.
Press the
CHARGER ON
or
CHARGER OFF
pushbutton on the System Controls
menu bar to toggle the charger on or off.
Summary of Contents for 9390
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