Vertiv Liebert EXS - Preliminary Checks

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5 Operating the UPS

5.1 Silencingthe Audible Alarm

If the audible alarm is enabled, it may sound during UPS operation. To silence the alarm, press and hold the ESC button for 3

seconds. The button is located on the front panel display. See Operation and Display Panel on page31.

5.2 UPS Startup

Perform startup only after the UPS installation is complete, all UPS wiring is complete, and all exterior access panels that were

removed for installation are replaced on the UPS.

The startup procedure starts the UPS in normal mode providing clean and protected AC power to the connected equipment.

To start the UPS:

1. Close the upstream feeder breakers for the UPS rectifier and bypass (if wired as dual input).

2. Close all downstream breakers including distribution panel main breaker and/or branch circuit breakers.

3. If external battery cabinets are installed, close the EBC breaker.

4. If optional PODs are installed, verify that all distribution breakers on the PODs are closed.

5. Ensure that the UPS MBB on the front of the UPS is OPEN and the mechanical interlock is secured in the lower

position (near the breaker handle).

6. Close the RIB, BIB, and MIB on the front of the UPS.

NOTE: The MIB is also the main output breaker of the UPS.

When the RIB and BIB breakers are closed, the UPS automatically begins the startup process and the boot up system checks,

which take approximately 20-30 seconds.

7. Before continuing to step 9 , make any changes/customization to the UPS operating parameters for the

installation or application. See Editing Display and Operation Settings on page38.

8. Can be set to startup on bypass, then the UPS will first output on bypass when starting up.

9. After the system checks are complete and/or operating parameters are set, press the power button at the front

panel display, then use the up/down arrow buttons to confirm Turn on local INV. See Figure 5.1 on the next page.

Vertiv™ Liebert® EXS Installer/User Guide

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