Sierra 240-VT Wiring Connections, Input Power Connections, AC Power Wiring, DC Power Wiring

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Series 24-HP Instruction Manual

Chapter 2 Installation

 

 

Warning! To avoid potential electric shock, follow National Electric Code safety practices or your local code when wiring this unit to a power source and to peripheral devices. Failure to do so could result in injury or death. All AC power connections must be in accordance with published CE direc- tives. All wiring procedures must be per- formed with the power off.

Wiring Connections

The NEMA 4X enclosure contains an integral wiring compartment with one dual strip terminal block (located in the smaller end of the enclo- sure). Two 3/4-inch female NPT conduit entries are available for sepa- rate power and signal wiring. For all hazardous area installations, make sure to use an agency-approved fitting at each conduit entry. If conduit seals are used, they must be installed within 18 inches (457 mm) of the enclosure.

Input Power Connections

To access the wiring terminal blocks, locate and loosen the small set screw which locks the small enclosure cover in place. Unscrew the cover to expose the terminal block.

Caution! The AC wire insulation tempera- ture rating must meet or exceed 85°C (185°F).

AC Terminals

AC Power Wiring

The AC power wire size must be 20 to 10 AWG with the wire stripped 1/2 inch (14 mm). The wire insulation temperature must meet or exceed 85°C (185°F). Connect 100 to 240 VAC (25 watts maximum) to the Hot and Neutral terminals on the terminal block. Connect the ground wire to the safety ground lug. Torque all connections to 4.43 to 5.31 in- lbs (0.5 to 0.6 Nm). Use a separate conduit entry for signal lines to re- duce the possibility of AC noise interference.

Figure 2-14. AC Power Connections

DC Power Wiring

The DC power wire size must be 20 to 10 AWG with the wire stripped 1/2 inch (14 mm). Connect 18 to 36 VDC (100 mA maximum current draw) to the +Pwr and –Pwr terminals on the terminal block. Torque all connections to 4.43 to 5.31 in-lbs (0.5 to 0.6 Nm).

Figure 2-15. DC Power Connections

DC Terminals

IM-24-HP

2-19

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Contents Models 240-VT, 240-VTP, 241-VT, 241-VTP Copyright Sierra Instruments Customer NoticeTable of Contents Troubleshooting and Repair Tables FiguresTable of Contents Using This Manual IntroductionInnova-MassMulti-Parameter Vortex Mass Flow Meters Technical Assistance Receipt of System ComponentsVelocity Measurement How the Innova-Mass Vortex Mass Flow Meter OperatesVortex Frequency Sensing Vortex Shedding FrequencyGas Liquid Flow Velocity RangeReynolds Number Range for the Innova-Mass Temperature MeasurementPressure Measurement Flow Meter ConfigurationsFlow Meter Electronics Installation Installation OverviewFlow Meter Installation Requirements Unobstructed Flow Requirements Flange Bolt Specifications Series 240 In-Line Flow Meter InstallationWafer-Style Flow Meter Installation Wafer-Style Flow Meter InstallationFlange-Style Flow Meter Installation Flange-Style Flow Meter InstallationSeries 241 Insertion Flow Meter Installation Mounting PositionIsolation Valve Selection Cold Tap Guidelines Flow Hot Tap GuidelinesUse the Correct Insertion Formula Flow Meter InsertionExample Installing Flow Meters with a Compression ConnectionInsertion Procedure for Meters with a Compression Connection Installing Flow Meters with a Packing Gland Connection Example 1 Flange Style MetersExample 2 NPT Style Meters Flow Meter with Permanent Insertion Tool 10. Flow Meter with Removable Insertion Tool 11. Insertion Calculation Meters without Insertion Tool Installation Display/Keypad Adjustment All Meters Adjusting Meter Orientation13. Enclosure Viewing Adjustment Enclosure Adjustment Series 240 OnlyInput Power Connections Wiring ConnectionsAC Power Wiring DC Power Wiring16. Load Resistance Versus Input Voltage MA Output ConnectionsPulse Output Connections 20. Isolated Pulse Output with External Power Supply 23. Isolated Alarm Output with External Power Supply Alarm Output Connections25. Isolated Alarm Output Using Meter Provided Power Supply Remote Electronics WiringOptional Energy EMS Input Electronics Wiring Optional Input Electronics WiringPage Operating Instructions Flow Meter Display/KeypadSierra Start-Up Run Mode ScreensProgramming the Flow Meter Using the Setup MenusTimeConstSec Xxxx Output MenuFirst, set the desired units of measurement Example for Setting an OutputDisplay Menu Example for Changing a Run Mode Display ItemExample for Setting an Alarm Alarms MenuTotalizer #1 Menu Example for Setting the TotalizerTotalizer #2 Menu Energy Menu For EMS Energy Meters Only ConfigurationFluid Menu Units Menu Time & Date Menu Example for Setting the TimeDiagnostics Menu Calibration Menu Password Menu Hidden Diagnostics Menus Troubleshooting and RepairColumn One Hidden Diagnostics Values IM-24-HP A2D Ref. Resistor = Factory Use Only Analog Output Calibration Troubleshooting the Flow Meter Symptom Output at no Flow Symptom No Output Symptom Meter Displays Temperature Fault Electronics Assembly Replacement All Meters Pressure Sensor Replacement Appendix a Product Specifications Appendix a Specifications Appendix a Specifications Cnpt IP66, Nema Page C D Appendix B GlossaryK L S T Page Calculations for Steam T & P Appendix C Fluid CalculationsDensity ViscosityDensity for real gases is calculated from the equation Calculations for Gas Real Gas and Other GasCalculations for Liquid Page PV AO Appendix D Hart Commands with DD MenuPV AO PV LRV URV Appendix D Hart Commands without DD MenuApplicable Flow Meter Models Appendix E Modbus CommunicationModbus Order Register Definitions Appendix E Modbus Commands Following registers contain the display units strings Control Register Definitions Examples An attempt to read registers that don’t exist 8C 3A CRC not the correct CRC EJS-02-06-07 Appendix E Modbus Commands