Eaton 9155 UPS (8–15 kVA) User's Guide 164201553 Rev G (www.eaton.com/powerquality) 57Chapter 11 OperationThis chapter contains information on how to use the Eaton 9155, including front paneloperation, UPS startup and shutdown, operation of the maintenance bypass switch,and configuring the UPS for Extended Battery Modules (EBMs).Control Panel FunctionsThe UPS has a four-button graphical LCD with backlight. It provides useful informationabout the UPS itself, load status, events, measurements, and settings (seeFigure 44).Power On Indicator (green)On Battery Indicator (yellow)Bypass Indicator (yellow)Alarm Indicator (red)Control Buttonsfor the LCD Menu OptionsFigure 44. Eaton 9155 Control PanelThe following table shows the indicator status and description.Indicator Status DescriptionGreenOn The UPS is operating normally.Flashing The UPS is starting up or is shut down and waiting for power to return. A new information message is active. Bypass is not available.Off The UPS is turned off and will not turn on automatically.YellowOn The UPS is in Battery mode.YellowOn The UPS is in Bypass mode.RedOn The UPS has an active alarm.Flashing There is a new UPS alarm condition. See “Troubleshooting” on page 79for additional information.