UPS Operating Instructions
Eaton 93E UPS (300/400 kVA, 380/400/415V) Installation and Operation Manual 6-19
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:
CAUTION
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. If the UPS contains an input breaker, verify that the input breaker is open.
3. If bypass input breaker is installed customer, verify that the bypass input breaker is open.
4. Close all Module Output Breakers (MOBs).
5. If input feeder circuit breaker is installed customer, close all input feeder circuit breakers.
6. If the UPS contains an input breaker, close the input breaker.
7. If bypass input breaker is installed customer, close the bypass input breaker.
8. Close the door and secure the latch.
9. Close the external battery breakers.
10. Observe the UPS control panel display becoming active, indicating logic power.
11. Verify no alarms are active.
12. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
13. If not already selected, select UPS on the System Control screen.
14. On the UPS System Control screen, select the LOAD OFF BYPASS command, then press the RETURN
pushbutton.
The critical load is immediately supplied by the bypass source, in Bypass mode from all UPSs.
The BYPASS status indicator is illuminated.
15. If output breaker is installed customer, close the output breaker.
6.4.3 Transfer from Normal to Bypass Mode
To transfer the critical load to Bypass mode:
CAUTION
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 BYPASS command, then press the RETURN
pushbutton.
All of the UPSs transfer to Bypass mode.
The BYPASS status indicator is illuminated. The power module remains on.
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