TDK 750W HALF RACK Noise and Impedance Effects, Inductive loads, Making the load connections

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3.9.4Noise and Impedance Effects

To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted pairs to the shortest possible length. Shielding of sense leads may be necessary in high noise environments. Where shielding is used, connect the shield to the chassis via a rear panel Ground screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of power supply. The sense leads should be separated from the power leads.

Twisting the load wires reduces the parasitic inductance of the cable, which could produce high frequency voltage spikes at the load and the output of the power supply, because of current variation in the load itself.

The impedance introduced between the power supply output and the load could make the ripple and noise at the load worse than the noise at the power supply rear panel output. Additional filter- ing with bypass capacitors at the load terminals may be required to bypass the high frequency load current.

3.9.5Inductive loads

Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should be connected across the output. The diode voltage and current rating should be greater than the power supply maximum output voltage and current rating. Connect the cathode to the positive output and the anode to the negative output of the power supply.

Where positive load transients such as back EMF from a motor may occur, connect a surge sup- pressor across the output to protect the power supply. The breakdown voltage rating of the sup- pressor must be approximately 10% higher than the maximum output voltage of the power sup- ply.

3.9.6Making the load connections

WARNING

Hazardous voltages may exist at the outputs and the load connec- tions when using a power supply with a rated output greater than 40V. To protect personnel against accidental contact with hazardous volt- ages, ensure that the load and its connections have no accessible live parts. Ensure that the load wiring insulation rating is greater than or equal to the maximum output voltage of the power supply.

CAUTION

Ensure that the load wiring mounting hardware does not short the output terminals. Heavy connecting cables must have some form of strain relief to prevent loosening the connections or bending the bus-bars.

6V to 60V Models

Refer to Fig.3-5 for connection of the load wires to the power supply bus-bars and to Fig.3-6 for mounting the bus-bars shield to the chassis.

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83-507-5002 Rev. B

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Contents Genesystm 750W Half Rack Page Page Genesys Manual Supplement Table of Contents Front and Rear Panel Controls and CONNECTORS………... ……… ……… Isolated Analog Progamming Option ……………………………..…… Warranty Safety Instructions Safety Instructions SICHERHEITS-INSTALLATIONS Anweisungen Anderungen and Bauteileersatz Sicherheits-und WarnsymboleUmweltbedingungen Features and options General InformationIntroduction General DescriptionMultiple output power system Control via the serial communication portAnalog voltage programming and monitoring Parallel operationAccessories Specifications ChapterFront Panel Supplemental Characteristics Genesystm Genh 750W Power Supplies Outline Drawings Installation GeneralPreparation for USE Initial InspectionsSingle unit installation Rack MountingAC Input Power Connection LOCATION, Mounting and CoolingAC Source Requirements GENH/RM Rack Mounting outline drawingsTURN-ON Checkout Procedure AC Input ConnectorAC Input Cord GeneralConstant Voltage Check Constant Current CheckOVP Check UVL CheckConnecting the Load Wire termination AWGNoise and Impedance Effects Inductive loadsMaking the load connections 6V to 60V ModelsBus-bars shield mounting 80V to 600V Models 83-507-5002 Rev. B Connecting single loads, remote sensing Connecting single loads, local sensing defaultConnecting multiple loads, radial distribution method Multiple load connection with distribution terminals Grounding outputsSense wiring Output Terminal GroundingLocal and Remote Sensing Local sensing10.4 J2 sense connector technical information Remote sensingFront Panel Controls and Indicators Front and Rear Panel Controls and ConnectorsVoltage Auxiliary Function Rear Panel Connections and Controls Rear panel connections and controls Number DescriptionRear Panel SW1 Setup Switch 1 SW1 position functionResetting the SW1 switch Rear Panel J1 Programming and Monitoring ConnectorMaking J1 connections 83-507-5002 Rev. B Signal EnainIfcom LocalConstant Voltage Mode Constant Current ModeLocal Operation Standard OperationSetting the OVP level Resetting the OVP circuitOver Voltage Protection OVP Automatic CrossoverOutput SHUT-OFF SO Control VIA Rear Panel J1 Connector Under Voltage Limit UVLFoldback Protection Output ON/OFF ControlENABLE/DISABLE Control VIA Rear Panel J1 Connector CV/CC SignalPsok Signal Over Temperature Protecton OTPLast Setting Memory SAFE-START and AUTO-RESTART ModesSeries Operation Series connection for increased output voltageSeries connection for positive and negative output voltage Series connection for positive/negative output voltagesSetting up the Master unit Setting up the Slave unitsParallel Operation Basic parallel operationSetting Over Voltage protection Setting Foldback protectionAdvanced parallel configuration Setting the units as Master or SlaveMaster and Slave units default operation To release units from Slave modeCurrent display accuracy AST OFF OUT OFFDAISY-CHAIN Connection Front Panel LockingUnlocked front panel Locked front panelRemote Analog Programming LOCAL/REMOTE Analog IndicationDown Remote voltage programming connectionResisitive Programming of Output Voltage and Current Limit Remote resistive programmingRemote Monitoring of Output Voltage and Current RS232 & RS485 Remote Control Configuration6 RS232/RS485 port in Local mode Rear Panel RS232/RS485 ConnectorFront panel in Remote mode MD Mode Description MD Mode enable Serial communication modeMD Mode SRQ MD Mode SRQ RetransmissionConnecting Power Supplies to RS232 or RS485 BUS Single power supplyCommunication Interface Protocol Error Messages Command SET DescriptionID Control Commands Initialization Control CommandsOutput Control Commands DVC? FilterFILTER? OUT?Global Output Commands Single Byte Commands Enable MD Mode MD Mode Option RequiredDisable SRQ retransmission MD Mode Option Required Enable SRQ retransmission MD Mode Option RequiredPrint Power On Time Addressed commands with response Read registersRetransmit Last Message Addressed commands without response Acknowledge SRQ Test if MD Mode is InstalledRe-enable SRQ with out reading/clearing the Seve Register 110x STATUS, Error and SRQ Registers Status Control CommandsConditional Registers TXDService Request Enable and Event Registers BITFault Enable Register Fault Event RegisterStatus Enable Register Status Event RegisterSerial Communication Test SET-UP Power supply set-upCommunication Test Specifications Isolated Analog Programming Option1 0-5V/0-10V Option PN IS510 PPM/CIsolated Programming & Monitoring Connector Setup and Operating Instructions Maintenance OUP Fuse Rating