Eaton DV2-C16-3 Series Installation And Operation Manual

MaintenanceCopyright © 2008-2009 Eaton Corporation. All Rights Reserved.IPN 997-00012-71B July 2009 49Problem Possible Cause Required ActionThe Battery Mid-pointMonitoring system hasdetected a voltage imbalancein one of the battery strings.See Battery Mid-point Monitoringon page 64.String Fail AlarmA Battery Mid-pointMonitoring sense wire isdisconnected.Check the sense wires.I/O board Power/CommsOK LED is offI/O board is not powered orfaulty.Check connection to YH3 on I/Oboard. See Connections on page 6.Replace I/O board if faulty.I/O board Power/CommsOK LED is flashing.I/O board is responding to anIdentify command from theSC200.None, this is normal operation.LVD Status LED(s) (on I/Oboard) are on.LVD contactor is energized. None, this is normal operation.LVD Status LED(s) are off(I/O board Power On LEDis on).LVD contactor is de-energized. None, this is normal operation.LVD Status LED(s)flashing.The contactor is in the wrongstate (SC200 internal state doesnot match signal fromcontactor auxiliary switch).Check the electrical and mechanicaloperation of the contactor andauxiliary switch.Check all wiring and connectors. SeeConnections on page 6.LVD settings incorrect. Use DCTools/Web to check LVDcontrol channel is enabled and set tocorrect values. See details.Check that the LVD manual controlis set to AUTO. See details in theSystem Controller OperationHandbook.Check that the contactor is correctlyconfigured and mapped to the I/Oboard. See details in the SystemController Operation Handbook.LVD contactor(s) notoperating.Contactor is disconnected. Check the control and dc powercables are connected. See details onpage 6.One or more MOVs havefailed because of lightningstrike(s) or ac transients.Check the visual indicators on allthe MOVs. If a visual indicatorindicates a failed MOV, replace allthe MOVs as soon as possible. SeeMonitoring and Replacing TransientProtective Devices on page 63.One or more MOV cartridgesnot properly fitted.Check that the MOV cartridges areproperly inserted in the MOVcartridge holders.MOV Fail Alarm active.Faulty MOV Fail alarm wiring. Check the MOV Fail alarm wiring.