UPS Operating Instructions10-12 EATON Powerware® 9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.com7. 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, the UPMsynchronizes with the output and closes output contactor K3. The UPM is onlineand in Normal mode with the NORMAL status indicator illuminated and in parallelwith the other system UPMs.9. Close battery breakers for the UPM any time after INVERTER SYNCING or CLOSEBATTERY appears on the display.10.2.7 Parallel System and Critical Load ShutdownTo perform maintenance or service on the critical load, shut down power to the load byperforming the following procedure:C A U T I O NUsing the following procedure removes all output from the critical load. You should use thisprocedure only when 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. The SystemControls screen appears.3. Press the BYPASS pushbutton on the System Controls menu bar of any UPM.The UPMs transfer to Bypass mode.4. Press the pushbutton to display System Controls Screen 2.5. Press the PM OFF pushbutton on the System Controls menu bar.The power module (PM) status indicates SHUTDOWN . The input and outputcontactors open, the battery breaker or disconnect is tripped, and the powermodule is turned off. The bypass source supplies the critical load.6. Repeat Steps 2, 4, and 5 for each UPM, except the last UPM
