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UPS Operating Instructions
10-8
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
10.2 Multiple Module Parallel Operation
10.2.1 Starting the Parallel System in Normal Mode
To start the parallel system, perform the following procedure:
1. Close all uninterruptible power module 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 NORMAL pushbutton on the System Controls menu bar of any UPM.
If Auto Bypass is enabled, the critical load is immediately supplied by the bypass
source, in Bypass mode, until the inverters turn on and the UPMs transfer to
Normal mode. The status indicator on each UPM control panel indicates the UPM
isinBypassmode.IfAutoBypassisnotenabled,theUPMoutputsremainoffuntil
theUPMstransfertoNormalmode.
7. Observe the following messages appear sequentially on the power module (PM)
status line of each UPM:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
ONLINE
The rectifier and inverter turn on. The inverter continues to ramp up to full
voltage.
8. Close the battery breakers for each UPM any time after INVERTER SYNCING or
CLOSE BATTERY appears on the display.
Once the inverter reaches full voltage, and the battery breaker is closed, each UPM
output contactor K3 closes and each static switch turns off. Power is now supplied
to the critical load in Normal mode. It takesapproximately1minutefortheUPMs
to achieve Normal mode.
9. The UPMs are now operating in Normal mode and the NORMAL status indicator
on each UPM is illuminated.