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UPS Operating Instructions
10-5
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
10.1.7 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 in paragraph 10.1.9.
The input, output, and bypass backfeed contactors open, the battery breaker or
disconnect is tripped, and the power module is turned off.
WARNING
Power is present inside the UPS cabinet until the upstream input feeder circuit b reaker is
opened.
3. Open the UPS input and bypass (if dual feed) feeder circuit breakers.
10.1.8 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 CHGR ON or CHGR OFF pushbutton on the System Controls menu bar
to toggle the charger on or off.