Power Supply, Ground the Transmitter, Option | Emerson 644 instruction

Reference Manual

00809-0400-4728, Rev AA June 2011

Rosemount 644

POWER SUPPLY

FOUNDATION fieldbus Installation

Ground the Transmitter

Powered over FOUNDATION fieldbus with standard fieldbus power supplies. The transmitter operates between 9.0 and 32.0 Vdc, 11 mA maximum. Transmitter power terminals are rated to 42.4 Vdc.

The power terminals on the 644 with FOUNDATION fieldbus are polarity insensitive.

The transmitter will operate with the current signal loop either floating or grounded. However, the extra noise in floating systems affects many types of readout devices. If the signal appears noisy or erratic, grounding the current signal loop at a single point may solve the problem. The best place to ground the loop is at the negative terminal of the power supply. Do not ground the current signal loop at more than one point.

The transmitter is electrically isolated to 500 Vdc/ac rms (707 Vdc), so the input circuit may also be grounded at any single point. When using a grounded thermocouple, the grounded junction serves as this point.

Neither side of the loop should be grounded on FOUNDATION fieldbus devices. Only the shield wire should be grounded.

NOTE

Do not ground the signal wire at both ends.

Ungrounded Thermocouple, mV, and RTD/Ohm Inputs

Each process installation has different requirements for grounding. Use the grounding options recommended by the facility for the specific sensor type or begin with grounding Option 1 (the most common).

Option 1:

1.Connect signal wiring shield to the sensor wiring shield.

2.Ensure the two shields are tied together and electrically isolated from the transmitter housing.

3.Ground shield at the power supply end only.

4.Ensure that the sensor shield is electrically isolated from the surrounding grounded fixtures.

Sensor Wires

Transmitter

Shield ground point

FOUNDATION Fieldbus segment

Connect shields together, electrically isolated from the transmitter

2-11

Image 21

Emerson 644 manual Power Supply, Ground the Transmitter, Foundation fieldbus Installation, Option

Contents

00809-0400-4728, Rev AA June Reference ManualPage Table of Contents Appendix a Specifications Reference DataAppendix B TOC-2 Customer Central National Response Center International Rosemount Temperature TransmittersPage Section Introduction Safety MessagesExplosions could result in death or serious injury Process leaks could result in death or serious injury Overview ManualTransmitter Considerations 250 C 482 F Oven Temperature 5 6 7 8 Extension Length 22 20 815 C 1500 F Oven TemperatureExample Above Section Installation Within Specifications? Refer to Configuration Bench Calibration?Simulate Sensor Input Mounting From draining into the transmitter housingMounting a 644H to a DIN Rail Rail asymmetric Installation Typical European InstallationHead Mount Transmitter with DIN Plate Style Sensor Head Mount Transmitter with Threaded Sensor Typical North American Installation Installing the LCD Display LCD Display Installation Power terminals does not drop below 9 Vdc Wiring Thermocouple or Millivolt Inputs Sensor Connections Sensor Lead Wire Resistance Effect- RTD Input Sensor Input Approximate Basic ErrorRTD or Ohm Inputs Error due to amb. temp. var. of ± 25 C Pt100 2-wire RTD Foundation fieldbus Installation Power SupplyGround the Transmitter Ungrounded Thermocouple, mV, and RTD/Ohm Inputs Grounded Thermocouple Inputs Overview Safety Messages Section Configuration Device Description Node Address General Block InformationModes Auto Resource Transducer Analog Input Other Link Active Scheduler Block Installation Foundation Fieldbus Function Blocks Capabilities Resource Block FeaturesUnicode Reports Failedalarms FeaturesselMaxnotify PlantWeb Alerts Failedmask Maintalarms Advisory Alarms Recommended Actions for PlantWeb AlertsRecommendedaction Sensor Transducer Block Configure the AI blockAnalog Input AI Function Block Damping Pressure Channel Temperature Channel LtypeXdscale and Outscale Transducer Block Configuration Examples Filtering Process Alarms Outd Alarmtype Displayparamsel LCD Transducer BlockBLKTYPE#1 PARAMINDEX#1 Overview Operation and MaintenanceUNITSTYPE#1 CUSTOMUNITS#1 Troubleshooting guide Troubleshooting Guides Problems with communications flowchart Calpointlo + Calminspan Recall Factory Trim DiagnosticsBlock Blockerr messages Sensor Transducer Block Xderr messages Calibrationerr Description Status Manual ModeSimulation Simulate Power Up Troubleshooting AI blockSymptom Possible Causes Recommended Actions 00809-0400-4728, Rev AA June AI Blockerr Conditions 8lists conditions reported in the Blockerr parameter Block Errors10. Resource Block Condition Name Self Test Procedure for the LCD Symptom Possible Causes Recommended ActionAuto Appendix a Specifications Reference Data SpecificationsFunctionalInputs Physical Performance Rosemount Conformance to Specifications Foundation Fieldbus SpecificationsFunction Blocks 2 σ -1 σ Alarms Power SupplyBackup Link Active Scheduler LAS Software Upgrade in the Field Accuracy Table A-1. Rosemount 644 Input Options and AccuracyAccuracy Example Ambient Temperature Effect Table A-2. Ambient Temperature EffectThermocouples Temperature Effects Examples 644H DIN a Head Mount Dimensional Drawings Mounting LCD Display00809-0400-4728, Rev AA June Sanitary Housing Covers LCD Display CoverRing 76.2 27.9 74.4 25.4 44.5 70.0 Options Ordering Information Alarm Level Configuration Standard Configuration StandardAssemble To Options Standard Enclosure Options Standard Considerations Tagging Transmitter Configuration Configuration toolWith DeltaV, with AMS, or other Foundation fieldbus host or Custom Configuration Standard Foundation fieldbus ConfigurationRequirements Option Code Specification Standard Block Configuration CE Electromagnetic Compatibility Compliance Testing Appendix B Product CertificationsAtex Directive 94/9/EC Hazardous Locations Certificates North American CertificationsRosemount 644 with Foundation fieldbus Fisco Loop/Power Terminals Loop/Power TerminalsEuropean Certifications Special Conditions for Safe Use IECEx Certifications Temperature ClassTo 60 C Fisco Group IIC To 80 C Transmitter I.S Transmitter Fisco Sensor Table B-3. Entity ParametersTransmitter Sensor Schedule of Limitations Pattern Approval for Measuring Instruments See Certificate Ukraine GostApproval Temp Description Group Code Installation Drawings Rosemount Rosemount Rosemount 00809-0100-4728, Rev AA June Sheet 2 00809-0100-4728, Rev AA June Sheet 3 00809-0100-4728, Rev AA June 00809-0100-4728, Rev AA June Sheet 2 Rosemount Rosemount 00809-0100-4728, Rev AA June Sheet 2 00809-0100-4728, Rev AA June Sheet 3 Basic Setup Resource Block Appendix C Foundation fieldbus Block InformationDefinition Index Parameters and Descriptions Features FailedenableFeaturesel Maintenable 00809-0400-4728, Rev AA Sensor Transducer Block Parameters DescriptionsDescription Effects transmitter operation Primaryvaluetype PrimaryvaluerangeSensrdetailedstatus Calvandusencoeff SESNOR1DAMPING XderrorTransducerdirectory Transducertype Analog Input AI Function Block Analog Measurement AccessOutd Cutoff Filter Convert Calc Ackoption AI Parameter Table Lolopri LCD Transducer Block Table C-4. LCD Transducer Block Parameters and DescriptionsParameter Index Description PID Block Table C-5. PID Block Parameters and DescriptionsParameter Index Index Bad Uncertain Ungrounded Wiring MODEBLK.TARGETLolim Lololim Lolopri Lopri Lower Trim Method DIN Rail Threaded Sensor Grounded Ungrounded Wiring Limited Man Mode Unicode UNITSTYPE# Upper Trim MethodSecurity Self Test Direct Zero Trim Index-4 Page Emerson Process Management Rosemount Inc Temperature GmbH Pacific Private Limited