HP 6624A, 6623A, 6621A manual Enabling/Disabling an Output, Setting Overvoltage Protection

Page 85

Enabling/Disabling an Output

The selected output channel can be turned on and off from the front panel. The OUTPUT ON/OFF key toggles the selected output on and off. When an output is turned off, the message ''DISABLED" will be displayed.

The OUTPUT ON/OFF key will not affect any other programmed functions nor will it reset an overvoltage or overcurrent condition. An output disabled by the OUTPUT ON/OFF key will behave as if it were programmed to zero volts and minimum current.

Setting Overvoltage Protection

Programmable overvoltage protection (OVP) guards your load against overvoltage by crowbarring and downprogramming the power supply output if the programmed overvoltage setting is exceeded.

A fixed OVP circuit with a trip level about 20 percent above the maximum programmable voltage acts as a backup to the programmable OVP. When overvoltage protection is activated, the output is shorted and the message ''OVERVOLTAGE" will appear on the front panel display.

The selected output's overvoltage setting is programmed locally using the OVSET key. For example, program the overvoltage to 10.5 volts by pressing:

OVSET

1

0

.

5

ENTER

Resetting Overvoltage Protection

The condition that caused the OV must first be cleared and then the output can be returned to its previous state by pressing the OVRST key.

Enabling/Disabling Overcurrent Protection

The overcurrent protection feature guards against excessive output currents. When the output goes into the + CC mode and OCP is enabled, the OCP circuit is activated which downprograms the output voltage and disables the output. For this condition, the message ''OVERCURRENT'' appears on the front panel display.

The selected output's overcurrent protection feature can be turned on and off from the front panel. The OCP key toggles the selected output's overcurrent protection circuit on and off. When it is on (enabled), the OCP ENBLD annunciator will be on.

Resetting Overcurrent Protection

The condition that activated the OCP circuit must first be cleared then the output can be returned to its previous state by pressing the OCRST key.

Displaying the Contents of the Fault Register

Each output channel has a fault register which can be used in conjunction with the status and mask registers to report a fault condition. A detailed description of these registers is given in Chapter 5. The main points of this description are repeated below for continuity in explaining how to use the front panel UNMASK and FAULT keys.

The mask register, which is set by the user, is used to specify which bits in the status register are enabled (unmasked) to set bits in the fault register. A bit is set in the fault register when the corresponding bit in the status register changes from 0 to 1 and the corresponding bit in the mask register is 1. Each output channel has its status, mask, and fault registers arranged as shown in Table 6-1.

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Contents HP Part No Operating ManualCertification Safety Summary Symbol Description Safety SummaryEMC Declaration of ConformityAppendix A--Calibration Procedure Installation ProceduresAppendix C--Command Summary Appendix D--Error MessagesTable Of Contents Local Operation Remote OperationError Messages Command SummaryCalibration Programming With The Series 200/300 ComputerPage General Information Safety ConsiderationsIntroduction Instrument and Manual IdentificationDescription AccessoriesOutput Combinations Available Model Output Low Range Values High Range Values Basic OperationHP-IB Board Output Boards Qualifying Conditions SpecificationsDefinitions Output Response Characteristics Source Effect SpecificationsOutputs Low High Voltage Temperature Coefficient Supplemental CharacteristicsReadback Resolution Outputs Low High Voltage Programming ResolutionAC Input Power and Current Command Processing Time see FigureDimensions all models Safety Agency ComplianceOutput Impedance Low Voltage High Voltage 80 W Low VoltageGeneral Information General Information General Information General Information Initial Inspection InstallationLocation and Cooling Line Fuse Input Power Requirements100/120 2110-0342 220/240 2110-0055 Line FusesLine Voltage Conversion Power CordHP-IB Interface Connector Page Getting Started Front Panel Controls and IndicatorsTurning On Your Supply HP-IB Status Annunciators LCL keyAnnunciators Power Supply StatusAlphanumeric LCD System Control KeysOutput Control Keys Numeric Entry Keys Line SwitchNormal Self Test Indications Sample Self-Test Failure Display Checking Out Your Supply Using Local ControlOvervoltage Test Voltage TestCurrent Test Iset Enter Introduction To Remote OperationOCP Enter/Output StatementsOutput Sending a Remote CommandReading the HP-IB Address AddrGetting Data From The Supply Often Used CommandsDisp a Disp a Returning the Supply to Local Mode Output Ranges Output Connections and Operating InformationOperating Quadrants Protection FeaturesRange Selection Typical Output Range Characteristics Connecting the Load Page Feet Wire Bundled 10 a 20 aCross Section Meters Area in mm2 Multiple Loads Remote Voltage SensingPositive and Negative Voltages Remote Sense Connections Remote Voltage SensingOutput Noise Considerations Output Type FormulaProgramming Response Time with an Output Capacitor Open Sense LeadsExternal Trigger Circuit Overvoltage Trigger ConnectionsEquivalent Internal OV Trigger Circuit Battery Charging Power Supply Protection ConsiderationsParallel Operation CV Operation Maximum Allowable Voltage SettingRemote Sensing CC Operation13. Series Connections with Local Sensing CV Operation Series Operation14. Series Connections with Remote Sensing Specifications for Series OperationPage Page HP-IB Operation Remote OperationInterface Function HP-IB Address Selection Programming Syntax Power-On Service Request PONNumeric Data Sheet 1 of 2. Syntax Forms for Power Supply Commands Sheet 2 of 2. Syntax Forms for Power Supply Commands Vset Fault ?Iset OvsetPage Initial Conditions Power Supply CommandsCurrent Programming Voltage ProgrammingRange Switching Overvoltage OV Protection Output On/OffOVSET? Multiple Output Storage & Recall Overcurrent Protection OCPStatus Reporting Clear CommandASTS? UNR +CCUNMASK? FAULT?Unmask 2,XXX Bit Assignment of the Serial Poll RegisterService Request Generation PON ? SRQ?RQS Bit Reprogramming DelayDisplay On/Off Other Queries Explanation Front PanelResponse Code Code Explanation TEST? ResponsesPage Local Operation Local ModeLocal Control Of Output Functions GeneralSetting Current Setting VoltageResetting Overvoltage Protection Setting Overvoltage ProtectionResetting Overcurrent Protection Displaying the Contents of the Fault RegisterSetting the Supplys HP-IB Address Setting the Reprogramming DelayLocal Control Of System Functions ConditionAddr Enter Displaying Error MessagesSTO Enter RCL EnterPage Test Equipment and Setup Required Calibration ProceduresFigure A-1. Calibration Setup General Calibration Procedure Are not stored. Exercise care when moving the leads 10 ! Calibration Example Calibration ProgramClear Voltmeter Output Buffer PauseDisp END of Calibration Program Input ANY More Outputs to CALIBRATE? Y or N,X$Fnend Page Page Path Names Programming With a Series 200/300 ComputerVoltage and Current Programming Voltage and Current Readback Voltage and Current Programming With VariablesPrint OUTPUT1 is in CV Mode END if Programming Power Supply RegistersService Request and Serial Poll Present StatusOFF Intr Enable IntrPrint Overvoltage on Output #1 Print Overvoltage on Output #2Error Detection Stored Operating States Programming Outputs Connected In ParallelInput Enter Operating VOLTAGE,V1 Input Enter Voltage LIMIT,VInput Enter the Desired Current Limit POINT,I Programming Outputs Connected In SeriesTable C-1. Command Summary Command SummaryCommand Description Table C-l. Command Summary ROM? PON?Previously Power-On Self Test Messages Error Responses Error Codes and MessagesTable D-l. Power-On Self Test Error Message Test ResponsesError Code Message Explanation ERR? query ERR key Table D-2. Error ResponsesResponse Code Explanation TEST? query Table D-3. TEST? ResponsesPage Make Changes Manual BackdatingII. CE92 Product Specific Annotations Generally Applicable Annotations6621A 6623AEurope Or contactFar East Latin America
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