113 Eaton® 9390 (100–160 kVA) UPS Installation and Operation Manual 164201604—Rev F
99..22 MMuullttiippllee UUPPSS PPaarraalllleell OOppeerraattiioonn
99..22..11 SSttaarrttiinngg tthhee PPaarraalllleell SSyysstteemm iinn NNoorrmmaall MMooddee
To start the parallel system:
1. Close all uninterruptible power module (UPM) 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 CCOONNTTRROOLLSS 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 NNOORRMMAALL 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 is in Bypass mode. If Auto Bypass is not enabled, the UPM outputs
remain off until the UPMs transfer to Normal mode.
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 takes
approximately 1 minute for the UPMs to achieve Normal mode.
9. The UPMs are now operating in Normal mode and the NNOORRMMAALL status indicator on each UPM is
illuminated.
99..22..22 SSttaarrttiinngg tthhee PPaarraalllleell SSyysstteemm iinn BByyppaassss MMooddee
If the inverter output of the UPMs is not available and the critical load needs to be energized:
In Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.
1. Close all UPM 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 CCOONNTTRROOLLSS pushbutton on the main menu bar of any UPM. The System Controls screen
appears on each UPM.
UPS Operating Instructions
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