UPS OPERATING INSTRUCTIONS
Eaton 9395 UPS (450–825 kVA) Installation and Operation Manual S 164201725 Rev 4 www.eaton.com/powerquality
7-31
7.4 Multiple UPS Distributed Bypass Operation
The paragraphs in this section provide operating instructions for a UPS system
containing multiple UPSs.
NOTE A Field Installed UPM (FI-UPM) is always designated as UPM 4.
7.4.1 Starting the Distributed Bypass System in Online Mode
To start the distributed bypass system:
1. Unfasten the front door latches and swing the doors open on all of the UPSs (see
Figure 4‐1 on page 4-2).
2. If the UPSs contain input breakers (CB1), verify that all input breakers are open.
3. Close all Module Output Breakers (MOBs).
4. Close all UPS input feeder circuit breakers.
5. Close all UPS Bypass input feeder circuit breakers.
6. If the UPSs contain input breakers (CB1), close all input breakers.
7. Close the doors and secure the latches.
8. Observe the UPS control panel displays becoming active, indicating logic power.
9. On any UPS, press the
CONTROLS pushbutton on the main menu bar. The System
Status screen is displayed.
10. On the System Status screen, verify the UPS status is SHUTDOWN and the UPM
status is SHUTDOWN.
11. Close all battery breakers.
12. Verify no alarms are active.
13. On the System Status screen, select the
UPS command.
14. Press the
CONTROLS pushbutton on the System Status menu bar. The UPS
Control Command screen is displayed.
15. On the UPS Control Command screen, select GO TO ONLINE.
16. Press the
SELECT pushbutton on the UPS Command menu bar.
If Auto Bypass is enabled (factory default), the critical load is immediately
supplied by the bypass source in Bypass mode from all UPSs, until the inverter
turns on and the UPSs transfer to Online mode. The status indicator on the UPS
control panel indicates the UPS is in Bypass mode. If Auto Bypass is not enabled,
the UPS outputs remain off until the UPSs transfer to Online mode.
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