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UPS Operating Instructions
10-12
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
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 STARTING
INVERTER STARTING
INVERTER SYNCING
READY
ONLINE
The rectifier and inverter turn on. When the inverter reaches full voltage, the UPM
synchronizes with the output and closes output contactor K3. The UPM is online
and in Normal mode w ith the NORMAL status indicator illuminated and in parallel
with the other system UPMs.
9. Close battery breakers for the UPM any time after INVERTER SYNCING or CLOSE
BATTERY appears on the display.
10.2.7 Parallel System and Critical Load Shutdown
To perform maintenance or service on the critical load, shut down power to the load by
performing the following procedure:
CAUTION
Using the following procedure removes all output from the critical load. You should use this
procedure 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 pushbuttononthemainmenubaronanyUPM.TheSystem
Controls screen appears.
3. Press the BYPASS pushbutton on the System Controls menu bar of any UPM.
TheUPMstransfertoBypassmode.
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 output
contactors open, the battery breaker or disconnect is tripped, and the power
moduleisturnedoff.Thebypasssourcesuppliesthecriticalload.
6. Repeat Steps 2, 4, and 5 for each UPM, except the last UPM