a/d/s/ iSeries manual 3 Two/Three/Four-Wire RTD, Ohm Wiring Hookup

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2.3.3 Two/Three/Four-Wire RTD

The figures below show the input connections and input connector jumpers (shown in bold lines) required to hookup a 2-, 3- or 4-wire RTD.

2-WIRE

3-WIRE

4-WIRE

 

 

 

 

 

 

 

 

 

 

 

 

2-WIRE

3-WIRE

4-WIRE

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2.5 a) RTD-1000 ohm and

b) RTD-100 ohm Wiring Hookup

500 ohm Wiring Hookup

 

The two-wireconnection is simplest method, but does not compensate for lead-wire temperature change and often requires calibration to cancel lead-wire resistance offset.

The three-wireconnection works best with RTD leads closely equal in resistance. The device measures the RTD, plus upper and lower lead drop voltage and the subtracts twice the measured drop in the lower supply current lead producing excellent lead-resistance cancellation for balanced measurements.

The four-wireRTD hookup is applicable to unbalanced lead resistance and enables the device to measure and subtract the lead voltage, which produces the best lead-resistance cancellation.

When configuring your controller, select RTD Type and RTD value in the Input Type menu (see Part 3).

If the input wires of the meter get disconnected or broken, it will display +OPN “Input (+) Open” message except in case of 500/1000 Ω 2-wire RTD. In this case the display shows -OPN “Input (-) Open” message. For safety purpose you may want to set up your alarm to be triggered when input is open. See Alarm 1 and 2 chapters for details.

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Contents Newport Electronics,Inc Newport Electronics,Inc Table of Contents Input Properties Factory Preset Values Flow Chart for Alarm 1 Menu Flow Chart for Alarm 2 MenuList of Figures List of TablesTIP Description Part IntroductionEMC Considerations Safety ConsiderationsBefore You Begin Optional Remote Programmer Front Panel Part SetupFront Panel Connections PowerInput OutputMain Power Connections Fuse Requirement see specifications Electrical Installation Power ConnectionsThermocouple Input Thermocouple Wiring Hookup TC Wire Color ChartOhm Wiring Hookup 3 Two/Three/Four-Wire RTDProcess Voltage Process CurrentIsolated Analog Output Wiring Hookup Wiring Outputs10 Snubber Circuits Wiring Hookup 13 Excitation Output Button Function in Configuration Mode Operation Configuration Mode IntroductionPart Flow Chart for ID and Set Points Menu ConfigurationEntering Your NON-DEFAULT SETPOINT/ID Security ID Number Entering Your NON-DEFAULT Full Security ID NumberID Number Setpoint Set PointsEnter Configuration Menu Configuration MenuInput Type Menu Enter Input Type Menu Input Type ThermocoupleThermocouple Submenu Thermocouple TypesRTD Submenu Input Type RTDRTD Types RTD Value SubmenuInput Type Process Reading Configuration MenuProcess Submenu Process TypesTemperature Unit Submenu Enter Reading Configuration MenuDecimal Point Submenu Filter Constant SubmenuINPUT/READING Scale and Offset Submenu Reading Configuration If Process was selectedRange Conversion Number Conversion TableEnter Alarm 1 Menu AlarmAlarm 1 ABSOLUTE/DEVIATION Submenu Alarm 1 ENABLE/DISABLE SubmenuAlarm 1 LATCH/UNLATCH Submenu Active Submenu Contact Closure SubmenuAlarm 1 LOW Value Submenu Alarm ENABLE/DISABLE AT Power onAlarm 1 HI Value Submenu Enter Alarm 2 Menu Loop Break Time/Field Calibration Loop Break ENABLE/DISABLE SubmenuEnter Loop Break Time Menu Loop Break Time Value SubmenuSetpoint Deviation ENABLE/DISABLE Submenu Reading Adjust SubmenuThermocouple Field Calibration Submenu Output Flow Chart for OutputSelf Submenu Enter Output 1 MenuMINIMUM/PERCENT LOW Submenu Control Type Output Relay, SSR, or Pulse MAXIMUM/PERCENT High SubmenuAction Type Submenu Anti Integral Submenu Auto PID SubmenuProportional Band Submenu Start Auto Tune PIDRate Setup Submenu Reset Setup SubmenuCycle Time Submenu Deadband Submenu Damping Factor SubmenuEnter Analog Output Menu Analog Output RetransmissionCURRENT/VOLTAGE Submenu OUT ReadingSoak ENABLE/DISABLE Submenu Ramp ENABLE/DISABLE SubmenuRamp & Soak Enter Ramp and Soak MenuSoak Value Submenu Ramp Value SubmenuID Code Entering or Changing Your NON-DEFAULT ID CodeEnter ID Code Menu Full Security Level Submenu Entering or Changing Your Default ID CodeSETPOINT/ID Security Level Submenu Communication Option 12 Flow Chart for Communication OptionCommunication Parameters Submenu Enter Communication Option MenuBaud Submenu Parity SubmenuBUS Format Submenu Stop BIT SubmenuModbus Protocol Submenu Line Feed SubmenuCommunication Interface Standard Submenu Data Flow Mode SubmenuData Separation Character Submenu Data Format Submenu Alarm Status SubmenuMain Reading Submenu Peak Value SubmenuAddress Value Submenu Address Setup SubmenuTransmit Time Interval Submenu Transmit Time Interval Value SubmenuDisplay Color Selection Alarm 1 Display Color SubmenuEnter Display Color Selection Menu Normal Color Display SubmenuExample Alarm 2 Display Color SubmenuDisplay Colors change sequences Green RED AmberAmber RED Green Part Specifications Control Output ControlSSR CommunicationsInsulation ExcitationGeneral Input Type Range Accuracy Input PropertiesFactory preset value Part 5 Factory Preset ValuesDisplay Color Colr Measurement Category Part CE Approvals InformationPage Page Page Warranty/Disclaimer M4165/N/0206