Emerson 4500 manual Connect Wiring and Power Up, Hart Terminal Blocks

Page 15

Reference Manual

00809-0100-4027, Rev AA December 2005

Rosemount 4500

Connect Wiring and Power Up

Wiring for HART Protocol

NOTE

Use shielded twisted pairs to yield best results. To ensure proper communication, use 24 AWG or larger wire, and do not exceed 5000 feet (1 500 meters).

Figure 2-5. HART Terminal

Blocks

ALARM

SECURITY

-LOOP

+LOOP

SPAN

ZERO

-LOOP

+LOOP

4500_25_AA.EPS

To make connections, perform the following procedure:

1.Remove the housing cover.

2.Connect the positive lead to the terminal marked (+) and the negative lead to the terminal marked (pwr/comm –).

3.Tighten cord grip to avoid moisture accumulation in the terminal compartment.

Signal Wiring Grounding

Do not run signal wiring in conduit or open trays with power wiring, or near heavy electrical equipment. Ground the signal wiring at any one point on the signal loop, or leave it ungrounded. The negative terminal of the power supply is a recommended grounding point.

Power Supply 4–20 mA Transmitters

The dc power supply should provide power with less than two percent ripple. Total resistance load is the sum of resistance from signal leads and the load resistance of the controller, indicator, and related pieces. Note that the resistance of intrinsic safety barriers, if used, must be included.

See load limitations in Section A: Reference Data.

NOTE

A minimum loop resistance of 250 ohms is required to communicate with a HART Communicator. If a single power supply is used to power more than one 4500 transmitter, the power supply used and circuitry common to the transmitters should not have more than 20 ohms of impedance at 1200 Hz.

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Contents Reference Manual Page Rosemount 4500 Hygienic Pressure Transmitter Page Table of Contents Section Operation MaintenanceSection Introduction Using this ManualService Support Overview Safety Messages Section InstallationConsiderations GeneralEnvironmental Hart Installation Flowchart Mount the Transmitter Installation ProceduresLCD Switches LOI Switches Set SwitchesAMS Configure Alarm DirectionHart Terminal Blocks Connect Wiring and Power UpGrounding Installing the LCD MeterSection Configuration Commissioning on the Bench with Hart Setting the Loop to ManualWiring Diagrams Menu Tree Hart CommunicatorFunction Hart Fast Key Sequence Fast Key SequenceReview Configuration Data Sensor Temperature Check OutputProcess Variables Basic Setup Set Process Variable UnitsRerange Fast Keys 3, 1 LCD Display DampingFailure Mode Alarm and Saturation Detailed SetupAlarm and Saturation Level Configuration Alarm and Saturation Values for Multidrop Mode Alarm and Saturation Levels for Burst ModeAlarm Level Verification Process Alerts Scaled Variable Configuration Rosemount Re-mapping Sensor Temperature Unit Diagnostics ServiceTransmitter Test Loop Test Advanced Functions for Hart Protocol Saving, Recalling, Cloning Configuration DataRosemount Burst Mode Multidrop Communication Changing a Transmitter Address Communicating with a Multidropped TransmitterPolling a Multidropped Transmitter Overview Calibration for Hart Protocol Operation and MaintenanceCalibration Overview Transmitter Data Flow with Calibration Options Determining Calibration Frequency Calculate total probable error TPEChoosing a Trim Procedure Sensor Trim Full Trim Zero TrimRecall Factory Trim Recall Factory Trim- Sensor Trim Analog Output Trim Digital-to-Analog Trim Recall Factory Trim- Analog OutputDigital-to-Analog Trim Using Other Scale Fail Module Diagnostic MessagesNonpv Limit Stuck KEY Troubleshooting Symptom Corrective Actions Specifications Performance SpecificationsAppendix a Reference Data 00809-0100-4027, Rev AA December Range and Sensor Limits Functional SpecificationsRosemount Physical Specifications 11/2 inch Tri-Clamp Module Dimensional DrawingsInch Tri-Clamp Module Fractional Line Fitting Module Code Process Connection Style Ordering InformationAppendix B Product Certificates North American Certifications Hazardous Locations CertificationsRosemount Rosemount Index Index-2 Page ¢00809-0100-4027 ¤