Controls and Operation
Eaton BladeUPS 12 kVA Maintenance Bypass Cabinet Installation and Operation Manual P-164000130—Rev 1 www.eaton.com/powerquality 6-3
6.3 Transferring the UPS to Maintenance Bypass
When the UPS is in Bypass mode, power is present inside the UPS cabinet.
l
Only trained personnel familiar with the operation of this equipment should transfer loads.
Failure to follow this transfer sequence may cause loss of power to loads or overload protection
devices to activate.
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In Bypass mode, the critical load is not protected from commercial power interruptions and
abnormalities.
NOTE After the interlock maintenance bar is set, the MBB and UOB can only be tripped off
at the same time by a fault or Remote Emergency Power-off (REPO) switch.
1. Put the UPS in Bypass mode. Refer to the Operation chapter in the Eaton
®
BladeUPS
®
User’s Guide
(Preassembled and Standard Systems) For use with Eaton BladeUPS 5.1 kVA to 60 kVA (N+1) systems to
confirm
the following detailed instructions on placing the UPS in Bypass mode:
- Press the CONTR
OLS pushbutton on the main menu bar. The System Controls screen appears.
- Press the BY
PASS pushbutton on the System Controls menu bar.
- The UPS transfers to Bypass mode and the critical load is imme
diately supplied by the (internal)
bypass source.
- The UPS is now operating
in Bypass mode and the BYPASS status indicator is illuminated.
When the UPS is in Bypass mode, the UPS IN BYPASS indicator light on the MBC is illuminated.
2. Close the MBB on the MBC.
3. Loosen the MBC maintenance interlock bar knobs by hand.
4. Slide the interlock bar until the standoff aligns with the BYPASS arrow.
5. Retighten the interlock bar knobs by hand.
Failure to close the MBB prior to opening the UOB will interrupt power to the load.
6. Open the UOB on the MBC. The UPS critical load is now directly supplied by utility power.
7. Shut down the BladeUPS modules.
8. Open the RIB on the MBC.
NOTE Opening the RIB and UOB on the MBC completely removes power to the UPS.
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