Powerware 10001100 kVA operation manual U T I O N

UPS OPERATING INSTRUCTIONS

7.4.10Using the UPS LOAD OFF Pushbutton or Command

A UPS Load Off is initiated by the LOAD OFF pushbutton from the main menu bar, the Load Off command on the UPS Control Command screen, or Load Off command on the Bypass Control Command screen. The UPS LOAD OFF controls the UPSs outputs by powering down the UPS and de-energizing the critical load.

The UPSs (including Bypass) remain off until restarted.

NOTE The UPS Load Off controls each UPS independently and does not shutdown the whole distributed bypass system. To immediately shutdown the whole system, use the REPO switch (see paragraph 7.4.11).

To use the LOAD OFF pushbutton:

1.Press the LOAD OFF pushbutton on the UPS to shutdown.

The Load Off screen is displayed, providing a choice to proceed or abort the shutdown.

C A U T I O N

All power to the critical load is lost when the LOAD OFF is selected in the following step. You should use this feature only when you want to de-energize the critical load.

2.To shut down the UPS, press LOAD OFF from the Load Off menu bar, and hold for three seconds. To abort the shutdown, press CANCEL.

When LOAD OFF is selected and held for three seconds, the input, output, battery, and bypass backfeed contactors open, and the power module is turned off on the UPSs.

3.If another UPS is to be shutdown, proceed to that UPS and repeat Steps 1 and 2.

C A U T I O N

Do not attempt to restart the system after Load Off until the cause of the shutdown has been identified and cleared.

4.Restart the UPS after pressing the LOAD OFF pushbutton by following the procedure in paragraph 7.4.1 on page 7−20 or 7.4.2 on page 7−21.

W A R N I N G

Power is present inside the UPS cabinet sections until the upstream input feeder circuit breaker is opened.

To use the LOAD OFF command:

1.Press the CONTROLS pushbutton on the main menu bar of the UPS to be shutdown. The System Status screen is displayed.

2.On the System Status screen, select either the UPS or the BYPASS command.

3.Press the CONTROLS pushbutton on the System Status menu bar. The UPS or Bypass Control Command screen is displayed.

4.On the Control Command screen, select LOAD OFF.

5.Press the SELECT pushbutton on the Command menu bar.

The Load Off screen is displayed, providing a choice to proceed or abort the shutdown.

7−26 EATON Powerware® 9395 UPS (1000–1100 kVA) Installation and Operation Manual S 164201764 Rev 1 www.powerware.com