Eaton 9EHD-33-40/20, User'S Installation And Operation Manual

Page: 68 / 90

To start the UPS system:
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 the input and output breakers are open.
3. If the UPS contains bypass input breakers, verify that the bypass input breakers is open.
4. If the UPS contains maintenance bypass switch, verify that the maintenance bypass switch is open or the
3-position maintenance bypass switch is on ‘UPS’ mode.
5. Close the UPS input feeder circuit breaker.
6. If the UPS contains bypass input breaker, close the UPS Bypass input feeder circuit breaker.
7. Close the input breaker.
8. If the UPS contains two input sources, close the bypass input breaker.
9. Close the output breaker.
10. Make sure MBS cover is installed.
11. Close the door and secure the latch.
12. Close the external battery breakers.
13. Observe the UPS control panel display becoming active, indicating logic power.
14. Verify no alarms are active.
15. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
16. If not already selected, select UPS on the System Control screen.
17. On the UPS System Control screen, select the LOAD OFF BYPASS command, then press the RETURN
pushbutton.
6 3 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.
The UPS transfers to Bypass mode.
The BYPASS status indicator is illuminated. The power module remains on.
WARNING
Power is present inside the UPS cabinet.
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual 60