UPS Operating Instructions
6-12
Eaton 9EHD UPS (80-200 kVA, 380/400/415V) Installation and Operation Manual
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. If the UPS contains input and output switches, verify that the input and output switches are open.
3. If the UPS contains a bypass input switch (80-100 kVA), verify that the bypass input switch is open.
4. If the UPS contains a bypass switches (80-100 kVA), verify that the bypass switch is open and the Neutral
Switch is closed.
5. Close the UPS input feeder circuit breaker.
6. If the UPS is fed from two input sources, close the UPS Bypass input feeder circuit breaker.
7. If the UPS contains an input switch, close the input switch.
8. If the UPS contains a bypass input switch, close the bypass input switch.
9. If the UPS contains an output switch, close the output switch.
10. Close the door and secure the latch.
11. Close the external battery breakers.
12. Observe the UPS control panel display becoming active, indicating logic power.
13. Verify no alarms are active.
14. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
15. If not already selected, select UPS on the System Control screen.
16. On the UPS System Control screen, select the LOAD OFF BYPASS command, then press the RETURN
pushbutton.
17. If the UPS contains an output switch, close the output switch.
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.
Summary of Contents for 9EHD Series
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