Eaton 9EHD Series, User'S Installation And Operation Manual

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6 3 4 Transfer from Bypass to normal mode
To transfer the critical load to Normal mode:
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 BYPASS NORMAL command, then press the RETURN
pushbutton.
The UPS transfers to Normal mode. If the power module is not available, the system remains on bypass
and an alarm sounds.
The NORMAL status indicator is illuminated.
6 3 5 Transfer from normal mode to Internal maintenance Bypass
To transfer the load to maintenance bypass:
1. On the UPS System Control screen, select the NORMAL BYPASS command, then press the RETURN
2. Loosen the screws that fix the cover over the maintenance bypass switch and slide the cover to the right.
This action will signal the UPS to transfer to static bypass. Refer to Figure 6-8 for switch arrangement.
3. Verify that the LCD/LED display indicates the UPS is in Bypass mode.
4. Close the Maintenance Bypass switch.
5. Open the Bypass Input and Output switches separately .
NOTE
• The Neutral Switch should remain closed unless operated by a service technician.
• Maintenance Bypass operate must be performed by an authorized Eaton Customer
Service Engineer.
WARNING
Power is present inside the UPS cabinet.
Remove this cover
BYPASS UPS
TEST
figure 6-8 20-40 kVa optional internal maintenance Bypass switch arrangement
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual 61