4. Verify that the UPS is operating in internal bypass mode before proceeding.
• If the unit is not in bypass mode, see Transferring from Normal (Inverter) to Bypass Mode on page42, for
the steps.
WARNING! Risk of improper operation. Failure to have the UPS operating on internal bypass and performing
the next step will result in loss of all output power to the connected equipment.
5. On the front of the UPS, open the MBB.
6. Loosen the thumb screw on the mechanical interlock on the MBB.
7. Slide the interlock to the right and tighten the thumb screw to secure the interlock in place.
8. Close and latch the front door of the UPS.
9. Press and hold the power button for 2 seconds.
10. Select the operation turn on UPS.
a. Select Turn on UPS.
b. Press Enter to confirm the action.
c. Press Enter again.
5.7 REPO
The UPS is equipped with a REPO connector for N.O. or N.C. systems. See REPO connection on page27, for connection
details.
Consult national and local wiring codes to determine if additional REPO is required for the external UPS rectifier and bypass
feeds.
5 Operating the UPS Proprietary and Confidential ©2023 Vertiv Group Corp. 45
Vertiv™ Liebert® EXS Installer/User Guide
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