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UPS Operating Instructions
10-9
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
10.2.2 Starting the Parallel System in Bypass Mode
If the inverter output of the UPMs is not available and the critical load needs to be
energized, perform the following procedure:
CAUTION
In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
1. Close all UPM input feeder circuit breakers.
2. If the UPMs are dual feed, close all UPM Bypass input feeder circuit breakers.
3. Observe all UPM control panel displays becoming active, indicating logic power.
4. Press the CONTROLS pushbutton on the main menu bar of any UPM. The System
Controls screen appears on each UPM.
5. On the System Controls screen of each UPM, the power module (PM) status
should indicate SHUTDOWN.
6. Press the BYPASS pushbutton on the System Controls menu bar of any UPM.
The critical load is immediately supplied by the bypass source, in Bypass mode.
7. The UPMs are now operating in Bypass mode and the BYPASS status indicator on
each UPM is illuminated.