Starting The Parallel Ups In Bypass Mode; Transfer From Normal To Bypass Mode - Eaton 9E Installation And Operation Manual

UPS Operating Instructions

6.4.2 Starting the Parallel UPS in Bypass Mode

If the inverter output of the parallel UPS is not available and the critical load needs to be energised:
In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
1. Unfasten the front door by lifting the latch from the bottom and turning to the right (counterclockwise) and
swing the door open (Figure 6-1).
2. Verify that all input breaker are open.
3. If the UPSs contain a bypass switch, verify that the bypass switches are open.
4. Close all Module Output Breakers (MOBs).
5. Close all UPS input feeder circuit breakers.
6. If the UPSs are wired for dual input, close all of the UPS Bypass input feeder circuit breakers.
7 . Close all input breakers.
8. If the UPSs contain a bypass input switch, close all of the bypass input switches.
9. Close the door and secure the latch.
10. Close the external battery breakers.
11. Observe the UPS control panel display becoming active, indicating logic power.
12. Verify no alarms are active.
13. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
14. If not already selected, select UPS on the System Control screen.
15. On the UPS System Control screen, select the LOAD OFF
pushbutton.
The critical load is immediately supplied by the bypass source, in Bypass mode from all UPSs.
The BYPASS status indicator is illuminated.
16. If the UPS contains an output switch, close the output switch.

6.4.3 Transfer from Normal to Bypass Mode

To transfer the critical load to Bypass mode:
In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
1. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
2. If not already selected, select UPS on the System Control screen.
3. On the UPS System Control screen, select the NORMAL
pushbutton.
All of the UPSs transfer to Bypass mode.
The BYPASS status indicator is illuminated. The power module remains on.
6-18 Eaton 9E UPS (80-200 kVA, 380/400/415V) Installation and Operation Manual
CAUTION
BYPASS command, then press the RETURN
CAUTION
BYPASS command, then press the RETURN