Eaton 9390IT Installation And Operation Manual

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UPS OPERATING INSTRUCTIONSEaton®9390 UPS (20–80 kVA) and 9390IT (20-40 kVA) Installation and Operation Manual 164201603 Rev 4 www.eaton.com/powerquality 9-159.2.6 Restarting a Single UPMTo restart a single UPM:NOTE When starting a 9390IT UPS with internal batteries, remove the battery compartment access panelby loosening the wing nut at the bottom of the panel and lifting the panel off the retaining hook at the top.(See Drawing 164201603-12 on page A-67)1. If the UPM was isolated from the critical bus, close the module output breakeron the tie cabinet or distribution panel.2. Observe the UPM control panel display becoming active, indicating logic power.UPM logic is being powered from the critical bus.3. Close the UPM input feeder circuit breaker.4. If the UPM is dual feed, close the UPM Bypass input feeder circuit breaker.5. Press the CONTROLS pushbutton on the main menu bar of the UPM. The SystemControls screen appears.6. On the System Controls screen, the power module (PM) status should indicateSHUTDOWN.7. Press the NORMAL pushbutton on the System Controls menu bar of the UPM.8. Observe the following messages appear sequentially on the power module (PM)status line of the UPM:DC STARTINGINVERTER STARTINGINVERTER SYNCINGREADYONLINEThe rectifier and inverter turn on. When the inverter reaches full voltage, theUPM synchronizes with the output and closes output contactor K3. The UPM isonline and in Normal mode with the NORMAL status indicator illuminated and inparallel with the other system UPMs.9. Close battery breakers for the UPM any time after INVERTER SYNCING orCLOSE BATTERY appears on the display.10. Reinstall the battery compartment access panel.9.2.7 Parallel System and Critical Load ShutdownTo perform maintenance or service on the critical load, shut down power to the loadby performing the following procedure:C A U T I O NUsing the following procedure removes all output from the critical load. You should use this procedure onlywhen you need to de‐energize both the parallel system and the critical load.1. Turn off all equipment that is being powered by the parallel system.2. Press the CONTROLS pushbutton on the main menu bar on any UPM. TheSystem Controls screen appears.