Varec 4000 4.3 Troubleshooting

Maintenance and Troubleshooting Tank Gauge Transmitter

28 Installation and Operations Manual

4.3 Troubleshooting

The ATT has provisions for hardware alarm inputs, software generated setpoint alarms, and other alarm conditions.

Alarm and error status conditions are available to the Model 1200, to the host Computer, and to the optional ATT

display. When in the Model 1200 display mode, the Diagnostic Status Menu displays only active alarm and error status

conditions. General status conditions such as HW IN 1 are always displayed.

4.3.1 ATT Error Status Conditions

Error Message Description

BAD COMM BOARD The communication board did not pass the loopback test. See

the description of the host communication loop-back tests.

BAD CPU BOARD RAM, EPROM, or EEPROM has failed.

BAD EEPROM CHECKSUM The EEPROM configuration data did not match the EEPROM

stored checksum. Examine all configuration parameters, make

any changes, and then use the "EXIT AND SAVE" option under

the Main Menu.

BAD EEPROM The value written to EEPROM memory did not match the value

read back from EEPROM memory. This is a critical alarm.

Contact the factory.

BAD EPROM The program EPROMs have failed the EPROM test. This is a

critical alarm. Contact the factory.

BAD LEVEL The level input is invalid.

BAD RAM The RAM has failed the RAM test. This is a critical alarm.

Contact the factory.

BAD RTD RESISTANCE The ATT detected an invalid RTD resistance. Usually due to an

open or shorted RTD input.

BAD TEMP The ATT detected an invalid temperature. Usually due to an

RTD failure.

CALC ERROR Calculation overflow or divide by zero error.

CONFIG ERROR See the ATT configuration error checking in this section.

LOW BATTERY The battery used to maintain the encoder circuitry has a low

voltage.

NO CALC ERROR The ATT can no longer perform calculation. See information

under the Stop Calculations Conditions section.

OFFLINE MODE A Model 1200 is connected to the ATT at tank side. No ATTI

Bus sensor communication is active.

RTD UNCOVERED The Resistive Temperature Device (RTD) sensor is uncovered.

Contents

Main Page Copyright Trademarks acknowledged Disclaimer of Warranties Limitations of Seller's Liability Terms of Use Page Page 1 Introduction 2 Installation 3 Configuration 4 Maintenance and Troubleshooting 5 Specifications 6 Order Codes 7 Theory of Operation 8 ATT Family of Products 9 Modbus Implementation 10 Optional Interfaces Glossary Page 1 4000 Introduction 1 Introduction 1.1 Using This Manual Figure 1-1: Tank Installation with Model 4000 ATT 1.2 Getting Acquainted with the Advanced Technology Transmitter (ATT) 1.3 Operation 1.4 Configuration 1.5 Construction Figure 1-2: Model 4000 Advanced Technology Transmitter Assembly 2 Installation 2.2 Mounting the Equipment Figure 2-2: ATT Mounting Diagram Page Figure 2-3: ATT Field Terminal Block Wiring 2.4.4 Connecting Host Communication 2.4.5 ATT EIA485 Wiring Figure 2-4: Typical EIA485 Wiring Installation Tank Gauge Transmitter 8 Installation and Operations Manual Figure 2-5: Typical EIA485 System Wiring 2.4.6 ATT Mark/Space Wiring Figure 2-6: Typical Mark/Space Field Wiring 2.5 Connecting the RTD 2.5.1 Connecting the Handheld Terminal 2.5.2 Wiring Completion 2.5.3 Installation Checkout 2.5.4 Installation Checklist 3 Configuration 3.1 Configuration Parameters 3.2 1200 Hand Held Terminal Page Figure 3-3: 1200 Hand Held Terminal 3.3 Terminal Mode Operation 3.4 Menu Operation 3.4.1 Main Menu 3.4.2 Summary Menu 3.4.3 Configuration Menu 3.4.4 Host Menu 3.4.5 Notes on Menu Items 3.5 Quick Setup 3.5.1 Imperial Fractional 1900 Quick Setup Defaults 3.5.2 Imperial Decimal 1900 Quick Setup Defaults 3.5.3 0-20 Meter 1900 Quick Setup Defaults 3.5.4 0-30 Meter 1900 Quick Setup Defaults Page 3.5.9 Imperial Modbus Quick Setup Defaults 3.5.10 Metric Modbus Quick Setup Defaults 4 Maintenance and Troubleshooting 4.1 Maintenance 4.2 Battery Replacement 4.3 Troubleshooting 4.3.1 ATT Error Status Conditions 4.4 ATT Status Conditions 4.5 ATT Configuration Error Checking 4.6 Model 1200 Error Messages 4.7 Host Communication Loopback Tests 5 Specifications 5.1 Specifications and Physical Characteristics 5.1.3 Input Power 5.1.1 Environmental 5.1.2 Physical 5.1.4 Level Measurement 5.2 Safety Agency Approvals 5.2.1 Explosion Proof 5.2.2 Intrinsic Safety 5.3 Major System Assemblies and Components Figure 5-1: ATT Major Assemblies 35 4000 Order Codes 6 Order Codes Page 37 4000 Theory of Operation 7 Theory of Operation 7.1 Overview Figure 7-1: ATT Block Diagram Table 7.2 CPU Board 7.3 Status Inputs and Outputs 7.4 ATTI Communications Port 7.5 Host Communications Interfaces 7.6 Level Measurement 7.6.1 Back-up Battery 7.7 Encoder Battery Backup 7.8 Temperature Measurement 7.9 Host Communication 7.10 Mark/Space Host Interface Page Page 8 ATT Family of Products Figure 8-1: ATT Family of Products 8.1 Model 4040 Display Unit Page 9 Modbus Implementation 9.1 Introduction 9.2 Implementation 9.3 Configuration Table 9-1: Modbus Functions Table 9-2: Modbus Configuration Information 9.4 Functions and Data Formats 9.5 Integer Registers 9.5.1 Integer Data 9.5.2 Integer Data 9.5.3 Character Data 9.5.4 Coded Data Hexadecimal representation 0002 (decimal 2) Level unit table representation: FT-IN-16TH 9.5.5 Packed Bit Data Note! Bit #0 is ON indicating a critical low level Alarm 9.6 Floating-Point Registers 9.6.1 Floating-Point Data 9.6.2 The Two 16-bit Registers Format 9.6.3 Floating Point Data 9.6.4 The One 32-bit Register Format 9.6.5 Floating Point Data 9.6.6 Floating Point Data 9.7 Status Bits 9.7.1 Status Bit Data 9.8 Exception Responses 9.9 Data Out of Range 9.10 Loopback Test 9.11 Hard ware Implementation 9.12 Integer Register Map Page Page Page 9.13 Floating Point Register Map 9.14 Status Bit Register Map Page 10 Optional Interfaces 10.1 4000TIFMO 10.2 4000GEFMO 10.3 4000LJFMO 10.4 4000MXFMO 10.5 4000WBFMO 10.6 4000GMFMO Glossary