Emerson NT5C06D user manual Troubleshooting, Alarm indication RFA fault

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6. Troubleshooting

Alarm indication

RFA fault

Table 9 - System fault diagnosis

Fault symptom	Possible causes

RFA	No AC input or input out of bounds.

	No AC input or input out of bounds.

	AC Input/DC output circuit breaker is open.

	Rectifier has received a HVSD signal from the
	controller.

	An internal high voltage shutdown (HVSD) has
	occurred. The internal High voltage shutdown point set too
	low (below float or equalize setting).

	Excessive impedance in one or both sense leads.

	The cooling fan is failed.

	DC circuit breaker is open.

	A thermal shutdown has occurred.
	Defective unit.
	Excessive ambient air temperature.
	Air inlet/outlet blocked, clogged air filter.

Helios Rectifier 25/48NT5C06D Installation and User Manual

Image 47

Contents P0831010 Standard 7.00 May Helios Rectifier 25/48 Single Phase -48V, 25 aPage Helios Rectifier 25/48 Single Phase -48V, 25A Page Publication history This page is left blank intentionally Contents Contents List of Tables List of ProceduresList of Figures ShelfThis page is left blank intentionally Description IntroductionEquipment Identification MPS75 NT5C10CX  power shelf 23-inchApplications MPS75 Modular Power Shelf-NT5C10C with 8-pin signal cables NT5C06D Switch Mode Rectifier Electrical specifications SpecificationsElectrical specifications Heat Dissipation Efficiency and Power FactorOutput noise and ripple ReliabilityStorage Environmental specifications OperatingTransportation Specifications Tools and test equipment Installation and start upInstalling the power shelf Procedure 1 Installing the power shelf Step Action Wiring the power shelfMax for each rectifier Installing the AC powerAC cable wire size AWG for each rectifierPower shelf individual AC connection DC Conductors InstallationConnecting the DC power shelf Control and Alarm ConnectionsRectifier 3 fail alarm Rectifier Failure AlarmRectifier 1 fail alarm Rectifier 2 fail alarmSense Fail AC Line Fail AlarmFan Alarm DC Circuit BreakerA0384387 SIG NAL Cables FRO M Shelves Verification Installing the rectifierFactory setting Rectifier meter accuracy Procedure 4 Starting up the rectifier StepHigh Voltage Shutdown Hvsd Adjustment Float Voltage Adjustment= 52.2 + .15 V = 52.35 Load Sharing Ii Forced ShareCurrent Limit Verification CL Forced Load Share Load Share Adjustment ProcedureProcedure 5 Adjusting the load share Step Action Slope Load ShareOperation High voltage shutdown Hvsd local FeaturesFront panel controls Local float / equalize controlFan failure alarm Start-up delayIndicators Rectifier failure alarm RFARemote voltage sensing Sense fail alarm SEN FailLocal ON/OFF control AC breaker Remote ON/OFF controlDischarge of output capacitors Sequential startParallel operation Thermal shutdown Local / remote high voltage shutdown resetPower interface edge connector Input AC voltage monitorPower interface connections Signal interface connectorControl signal connections Float / equalize MaintenanceProcedure 6 Adjusting the float / equalize Step Fan failure High voltage shutdown HvsdCooling fan Fan replacement NT5C06D rear view Power shelf This page is left blank intentionally System fault diagnosis Fault symptom Possible causes TroubleshootingAlarm indication RFA fault Fault symptom Possible causes SEN Fail faultErratic load fault Current or voltage float faultCPC Appendix a Replacement partsAppendix a Replacement parts Country Appendix B Technical service assistanceLocal toll-free prefixes United States Canada Europe Asia and the Pacific Appendix B Technical service assistanceToll-free technical assistance numbers List of terms and acronyms Sense Fail Rectifier Fail AlarmNormally Open Northern TelecomPage Part of Emerson Network Power