Powerware 9390 UPS 100160 kVA - Manual (Page 116)

UPS OPERATING INSTRUCTIONS
EATON Powerware ® 9390 UPS (20–80 kVA) Installation and Operation Manual S 164201603 Rev 2 www.powerware.com 9-8
9.2.2 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:
C A U T I O N
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.
9.2.3 Transfer Parallel System from Normal to Bypass Mode
To transfer the critical load to Bypass mode:
C A U T I O N
In Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.
1. Press the CONTROLS pushbutton on the main menu bar on any UPM. The
System Controls screen appears.
2. Press the BYPASS pushbutton on the System Controls menu bar of any UPM.
The UPMs transfer to Bypass mode and the critical load is immediately supplied
by the bypass source. If the bypass source is not available, the power processor
remains on and an alarm sounds.
3. The UPMs are now operating in Bypass mode and the BYPASS status indicator
on each UPM is illuminated.
The power module (PM) status indicates READY on each UPM. The system is
now on bypass and the UPM power processors remain on.
W A R N I N G
Power is present inside the UPM cabinets.