DELL H900N User Manual

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Operation

 Before using this feature, the UPS must have been powered by utility power with output enabled at least

once.

 Utility power cannot be present at startup.

To start the UPS on battery:

1

Press the 

 button on the UPS rear panel until the UPS beeps.

The UPS front panel display illuminates, and the UPS begins the startup sequence.

The UPS cycles through Standby mode to Battery mode. The Battery mode icon 

 displays on

the UPS status summary screen. The UPS supplies power to your equipment.

 The UPS does not assume the load if you press the 

 button less than three seconds.

2

Press the   button to check for active alarms or notices.

Ignore the “UPS on Battery” notice and notices that indicate missing utility power. Resolve other
active alarms before continuing. See “Troubleshooting” on page 59. After correcting the alarms,
restart if necessary.

You can prevent a battery start (requiring utility power at the next startup) by simultaneously pressing
the   and   buttons for three seconds. Battery start can be disabled. See the Start on Battery setting
on page 37.

To shut down the UPS:

1

Press the 

 button on the rear panel for three seconds.

The UPS begins to beep. The UPS transfers to Standby mode.

 Releasing the 

 button before three seconds returns the UPS to its original operating state.

2

Switch off utility power where the UPS is connected.

After utility power is removed, the UPS fully shuts down in ten seconds.