Eaton 9390 - Page 119

Eaton® 9390 (100–160 kVA) UPS Installation and Operation Manual 164201604—Rev F 104
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If the inverter output of the UPS 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 the UPS input feeder circuit breaker.
2. If the UPS is dual feed, close the UPS Bypass input feeder circuit breaker.
3. Observe the UPS control panel becoming active, indicating logic power.
4. Press the CCOONNTTRROOLLSS pushbutton on the main menu bar. The System Controls screen appears.
5. On the System Controls screen, the power module (PM) status should indicate SHUTDOWN.
6. Press the BBYYPPAASSSS pushbutton on the System Controls menu bar.
The critical load is immediately supplied by the bypass source, in Bypass mode.
7. The UPS is now operating in Bypass mode and the BBYYPPAASSSS status indicator is illuminated.
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To start the power module without transferring the critical load to normal:
1. Close the UPS input feeder circuit breaker.
2. If the UPS is dual feed, close the UPS Bypass input feeder circuit breaker.
3. Observe the UPS control panel becoming active, indicating logic power.
4. Press the CCOONNTTRROOLLSS pushbutton on the main menu bar. The System Controls screen appears.
5. On the System Controls screen, the power module (PM) status should indicate SHUTDOWN.
6. Press the pushbutton to display System Controls Screen 2.
7. Press the PPMM OONN pushbutton on the System Controls menu bar.
8. Observe the following messages appear sequentially on the power module (PM) status line:
DC STARTING
INVERTER STARTING
INVERTER SYNCING
READY
The rectifier and inverter turn on. When the inverter reaches full voltage, the UPS is ready to transfer to the
Normal mode and supply the critical load.
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To transfer the critical load to Bypass mode:
In Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.
1. Press the CCOONNTTRROOLLSS pushbutton on the main menu bar. The System Controls screen appears.
2. Press the BBYYPPAASSSS pushbutton on the System Controls menu bar.
UPS Operating Instructions
For Internal Use Only