Emerson 3081FG Section Maintenance and Service, Model 3081 Electronics Replacement

Page 55

Model 3081FG

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

SECTION 5

MAINTENANCE AND SERVICE

Install all protective equipment covers and safety ground leads after equip- ment repair or service. Failure to in- stall covers and ground leads could result in serious injury or death.

Disconnect and lock out power before working on any electrical components.

5-1 MODEL 3081 ELECTRONICS REPLACEMENT

Before replacing any electronic components, verify that the power to the Model 3081 Trans- mitter is removed. Refer to Table 8-1for re- placement part numbers.

a.Display Board Replacement

Use the following procedure to replace dis- play board (11, Figure 5-1).

1.Loosen screw (14) until cover lock (15) disengages from the knurled surface of circuit end cap (13).

2.Remove circuit end cap (13).

3.Remove three screws (12) retaining the electronics in place.

4.Lift display board (11) and disconnect the ribbon cable connector between the display board and the CPU board of PC board stack (10).

5.Using a replacement display board, connect the ribbon cable connector between the display board and the CPU board of PC board stack (10). Ensure the cable connector is fully seated.

6.Reposition display board (11) on the standoffs. Rotate the display board 90 degrees either way as desired.

7.Install and tighten all three screws (12).

8.Install circuit end cap (13).

9.Tighten cover lock screw (14) until cover lock (15) engages knurled sur- face of circuit end cap (13).

b.PC Board Stack Replacement

PC board stack (10, Figure 5-1)is com- posed of the CPU board and the analog board. Use the following procedure to re-

place these boards as a set.

5

1.Loosen cover lock screw (14) until cover lock (15) disengages from the knurled surface of circuit end cap (13).

2.Remove circuit end cap (13). Remove three screws (12).

3.Lift display board (11) and disconnect the ribbon cable connector between the display board and the CPU board of PC board stack (10).

4.Lift the CPU board from housing (1) by the standoffs.

5.Remove two screws (4) and lockwash- ers (3). Lift terminal block (6) until the analog board is unplugged from the terminal board.

6.Reinstall terminal block (6), lockwash- ers (3), and screws (4).

7.Lift the analog board from housing (1) by the standoffs.

8.Install replacement PC board stack

(10) into housing (1). Carefully seat the analog board onto housing pins. Press firmly on the CPU board standoffs to ensure good contact.

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Service 5-1

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Contents Model 3081FG Essential Instructions Highlights of Changes Page Model 3081FG Table of ContentsProper Calibration Check Gas Flow Rate List of IllustrationsModel 3081 Transmitter Terminal Block List of TablesModel 3081FG Definitions PrefaceModel 3081FG Component Checklist of Typical System Package Contents Section Description and SpecificationsCode Mounting Adapter Stack Side Product MatrixSystem Description System ConfigurationSystem Overview ScopeSystem Features Handling the Analyzer System Considerations Transmitter Typical System InstallationProbe SpecificationsOperating Load Region Lift OFF Maximum Power Supply VoltageOhms VDCInspect Section InstallationPRE-INSTALLATION Mechanical InstallationSide View Bottom View Front ViewMetal Wall Masonry Wall Stack or Duct Horizontal Probe Installation Adjusting Probe Insertion Depth Model 3081FG Installing Model 3081 Transmitter Mounting Holes Cover LockCircuit Terminal END Block TBElectrical Installation Display Positioning AssemblyTerminal Block Conduit Model 3081 Transmitter 4-20 mA and Signal ConnectionsThermocouple CELL-WH CELL+BK Calibration Check Gas Pneumatic InstallationReference Air Package Instrument Air Reference AirFlow SET MAX Point Knob Mounting Holes Outlet ConnectionOutlet Inlet ConnectionSection Startup and Operation Power UPGeneral Proper Calibration Check Gas Flow Rate Reestablishing Proper Calibration Check GAS Flow RateMenu Tree OperationOverview DisplayProgram DiagnosticsCalcheck MenuNavigation Infrared Remote Control IRCO2 Concentration O2 Concentration Analyzer Access Code Or SecurityAnalyzer Access Code Program MenuCell T HI O2 Concentration Indicator Fault ValueO2 Concentration Upper Cell Temperature Fault Value Upper Range VALSET O2 Filter Time Reset MAX Cell TTo Reset Maximum Cell Temperature O2 Concentration Analyzer Access CodeSET LO Bottle O2 SET HI Bottle O2Concentration Model 3081 Transmitter Parameters Parameter Range DefaultModel 3081 Transmitter Parameters SET Code Show Fault Diagnostics MenuC mV 24. Previous Slope Previous Constant 23. Cell ImpedanceSW Build Date SW Build NumberCalcheck Menu Accept LOW O2 27. in MANUAL?29. Accept LOW O2 Slope Model 3081FG Connections Hart Communicator Signal LineSection HART/AMS OverviewMethod 2, For Load Resistance 250 Ohms Analog Output Device Loop ConnectorsMenu Tree for Hart Communicator TWO-WIRE in Situ Oxygen AnalyzerHart Communicator PC OFF-LINE and ON-LINE OperationsDevice Setup From Sheet Basic Setup Detailed From Sheet Signal Condition Detailed Setup Output Hart Communicator Start CAL- Check Method Model 3081FG PC Board Stack Replacement Section Maintenance and ServiceModel 3081 Electronics Replacement Display Board ReplacementTwo-Wire In Situ Oxygen Analyzer Exploded View Oxygen Probe Replacement Oxygen Probe Terminal Block Probe Life Section TroubleshootingIMPEDANCE, Ω Ofresponse Fault IndicationsSpeed Thermocouple Identifying and Correcting Fault IndicationsFault 1, Open Thermocouple Fault 3, Shorted Thermocouple Fault 5, O2 Cell Open Fault 6, Cell Impedance Too High Fault 5, O2 Cell Open11. Fault 7, Reversed O2 Cell Fault 7, Reversed O2 CellModel 3081FG Section Return of Material Model 3081FG Index No Part Number Description Replacement PartsReplacement Parts List SectionModel 3081FG Section Index Model 3081FG Model 3081FG Page Section Drawings and Schematics Model 3081FG Warranty Two-Wire In Situ Oxygen Analyzer Serial no Order no
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