Xantrex Technology XFR 2800 manual Configuring, Parallel, Supplies for

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Local Operation

Using Multiple Supplies

sum of the maximum voltages of each supply (add voltmeter readings, to a maximum of 600 V). The maximum allowable current for a series string of power supplies is the output current of a single supply in the string.

	Figure 3.2 Series Operation of Multiple Supplies
Configuring	Use parallel operation to obtain a higher current through a single output using two or
Multiple	more supplies. Set all of the OVP setpoints to maximum. (See “Using Over Voltage
Supplies for	Protection (OVP)” on page 61.) Set all of the outputs to the same voltage before
Parallel	connecting the positive (+) output terminals and negative (–) output terminals in
Operation	parallel. See Figure 3.3. The total current available is the sum of the maximum
	currents of each supply.
	When operating multiple supplies in parallel, the operating mode of each supply
	depends on the load current being drawn. For example, with two 40 V, 70 A power
	supplies operating in parallel with a 100 A load, one supply operates in constant
	current mode supplying 70 A and the other supply operates in voltage mode
	supplying the remaining 30 A. The level of current sharing between units depends
	on how accurately the output voltages are matched.
	Note:If you do not fix the OVP setpoints at maximum, the OVP circuit may trip on
	one unit, reducing the current available to the load.

66	Operating Manual for XFR 2.8kW Series Power Supply

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Contents XFR 2800 Watt Series Programmable DC Power Supply Page XFR 2800 Watt Series How do you get service? What does this warranty cover and how long does it last?What will Xantrex do? Phone 604 422 Toll Free North America 800 667 Fax 604 421What does this warranty not cover? Disclaimer Product Information About Your Power Supply Model Number Serial Number Purchased From Purchase DatePower Supply Safety Manual Revisions Who Should Use This ManualMain Sections Power Supply Safety Markings About This ManualContents Section Local Operation Remote CalibrationList of Figures List of Figures List of Tables List of Tables Model Voltage Range Current Range Features and OptionsDescription Features and Specifications Power Supply Front Panel Front Panel ControlsRear Panel Connectors and Switch Power Supply Rear Panel Shows the functions assigned to each SW1 switch Switch Function Open Closed HIGH=OFF HIGH=ONProgramming and Monitoring J2 Connector Connector Reference Name Function VrmtWiring Making J2 ConnectionsSpecifications Models 300 12-220 20-130 33-85 40-70 Features and Specifications Models 60-46 100-28 150-18 300-9 600-4 Features and Specifications Additional Specifications Input ConditionsAdditional Features Remote Programming MonitoringEnvironmental Specifications Mechanical Specifications Output ConnectorDimensional Drawings Step # Description Action Reference Basic Setup ProcedureIntroduction Inspection, Cleaning, and Packaging Initial Inspection Periodic CleaningReturning Power Supplies to the Manufacturer Packaging for Shipping or Storage Shipping or Storage Carton LabelLocation, Mounting, and Ventilation Rack MountingAC Input Power AC Input Connector Voltage SelectionAC Input AC Voltage Range FrequencyAC Input Wire Connection Wire Size Ratings Cable Outside DiameterAC Input Cover and Strain Relief Voltage Mode Operation Check Power-on CheckFunctional Tests Equipment RequiredCurrent Mode Operation Check Front Panel Function Checks Load Connection Load WiringWire Size Maximum Current a Maximum Load Wire Length for 1 V Line Drop Making Load ConnectionsOutput Strain Relief and Cover Typical Load Connection Hardware Output Voltage Connector To 600 V ModelsSingle Load with Local Sensing Default Multiple Loads with Local Sensing 10Multiple Loads with Remote Sensing Sense Wiring Local and Remote Sensing11J10 Sense Connector Terminal Name FunctionUsing Remote Sensing 12 shows a sample setup for using remote sensing Standard Operation Operating Modes Automatic CrossoverLocal Operation Standard OperationMode ConfigurationShipped Setting Output Voltage Current Limit Using Over Voltage Protection OVP OVPResetting the OVP Circuit Using the Shutdown Function Controlling Shutdown Function via ConnectorLED Using Multiple Supplies Configuring Multiple Supplies for Series OperationSupplies for ConfiguringParallel Supplies for Split Supply Operation Parallel Operation of Multiple SuppliesPositive-negative Supply Split Supply Operation of Multiple SuppliesLocal Operation Over Temperature Protection OTP Switch SW1-8 OTP Shutdown Selection DescriptionUser Diagnostics Emergency ShutdownUnusual or Erratic Operation Abbreviated References Used in TableSymptom Check Further Checks and Corrections Remote Operation Remote Analog Programming Procedure OptionsRemote Operation Control Programming ScalesRemote Operation Power Supply Settings for Different Programming Sources Connecting Programming Sources to J2 Connector Remote Monitoring of Output Voltage and Current Calibration Setup ServicePrecautions EnvironmentAccessing Calibration Potentiometers Programming and Monitoring Calibration Locations Calibrating for Programming Accuracy Voltage Programming Circuit CalibrationCurrent Limit Programming Circuit Calibration Calibrating for Readback Accuracy Output Voltage Monitor Circuit CalibrationOutput Current Monitor Circuit Calibration Calibration Page Xantrex Technology Inc