Operations26 IST5 Tower UPS 10kVA~40kVA User ManualIndicators State DescriptionBypassindicatorSteady green Load supplied by bypassSteady red Bypass abnormal or out of normal range, or static bypass switchfaultFlashing red Bypass voltage abnormalOff Bypass normalInverterindicatorSteady green Load supplied by inverterFlashinggreenInverter on, start, synchronization or standby (ECO mode) for atleast one moduleSteady red System output not supplied by inverter, inverter fault for at least onemodule.Flashing red System output supplied by inverter, inverter fault for at least onemodule.Off Inverter not operating for all modulesLoadindicatorSteady green UPS output ON and normalSteady red UPS overload time is out, or output short, or output no power supplyFlashing red Overload output of UPSOff No output of UPSStatusindicatorSteady green Normal operationSteady red FailureThere are two different types of audible alarm during UPS operation, as shown in Table4.2.Table 4.2 Description of audiblealarmAlarm DescriptionTwo short alarmwith a long one when system has general alarm (for example: AC fault),Continuous alarm When system has serious faults (for example: fuse or hardware fault)4.2.2 Control and Operation KeysControl and operation keys include four keys, which are used together with LCD screen.The functions description is shown in Table 4.3.Table 4.3 Functions of Control and operation keysFunction Key DescriptionEPO Long press,cut off the load power (shut down the rectifier, inverter,static bypass and battery)TAB TransferENTER ConfirmESC QuitAttentionWhen bypass frequency is over track, there is interruption time(less than 10ms) for transferring frombypass to inverter.