UPS OPERATING INSTRUCTIONSEATON Eaton 9395 550/275 UPS (225–550 kVA) Installation and Operation Manual 164201716 Rev 2 www.eaton.com/powerquality7-307.4 Multiple UPS Distributed Bypass OperationThe paragraphs in this section provide operating instructions for a UPS systemcontaining multiple UPSs.NOTE A Field Installed UPM (FI-UPM) is always designated as UPM 4.7.4.1 Starting the Distributed Bypass System in Online ModeTo start the distributed bypass system:1. Unfasten the front door latches and swing the doors open on all of the UPSs (seeFigure 4‐2 on page 4-4).2. If the UPSs contain input breakers (CB1), verify that all input breakers are open.3. Close all Module Output Breakers (MOBs).4. Close all UPS input feeder circuit breakers.5. Close all UPS Bypass input feeder circuit breakers.6. If the UPSs contain input breakers (CB1), close all input breakers.7. Close the doors and secure the latches.8. Observe the UPS control panel displays becoming active, indicating logic power.9. On any UPS, press the CONTROLS pushbutton on the main menu bar. The SystemStatus screen is displayed.10. On the System Status screen, verify the UPS status is SHUTDOWN and the UPMstatus is SHUTDOWN.11. Close all battery breakers.12. Verify no alarms are active.13. On the System Status screen, select the UPS command.14. Press the CONTROLS pushbutton on the System Status menu bar. The UPSControl Command screen is displayed.15. On the UPS Control Command screen, select GO TO ONLINE.16. Press the SELECT pushbutton on the UPS Command menu bar.If Auto Bypass is enabled (factory default), the critical load is immediatelysupplied by the bypass source in Bypass mode from all UPSs, until the inverterturns on and the UPSs transfer to Online mode. The status indicator on the UPScontrol panel indicates the UPS is in Bypass mode. If Auto Bypass is not enabled,the UPS outputs remain off until the UPSs transfer to Online mode.
