Installation Instructions User Manual

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Publication 1746-IN010D-EN-P - June 2004

Installation Instructions

SLC™ 500 4-Channel Thermocouple/mV Input

Module

(Catalog Number 1746-NT4, Series B)

Inside…............................................................................................Page

For More Information............................................................................... 3

Hazardous Location Considerations .........................................................4

Environnements dangereux ..................................................................... 4

Overview ...................................................................................................5

Required Tools and Equipment ................................................................ 6

Electrostatic Damage............................................................................... 7

NT4 Power Requirements........................................................................ 7

Modular Chassis Considerations............................................................. 7

Fixed Expansion Chassis Considerations................................................. 8

General Considerations ........................................................................... 8

Terminal Block Removal........................................................................... 8

Module Installation and Removal.......................................................... 10

Terminal Wiring...................................................................................... 11

Thermocouple Junctions........................................................................ 12

Wiring Considerations ........................................................................... 13

Wiring Input Devices to the NT4 ........................................................... 15

Cold-Junction Compensation (CJC) ....................................................... 16

Module Addressing................................................................................ 17

Channel Configuration ........................................................................... 17

Specifications ........................................................................................ 19

Summary of content (24 pages)

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Installation Instructions SLC™ 500 4-Channel Thermocouple/mV Input Module (Catalog Number 1746-NT4, Series B) Inside…............................................................................................Page For More Information............................................................................... 3 Hazardous Location Considerations .........................................................4 Environnements dangereux .....................................................................
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SLC™ 500 4-Channel Thermocouple/mV Input Module Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 3 For More Information Related Publications For: Refer to this Document: Thermocouple/mV Input Module A more detailed description on how to install and use your SLC 500 4-Channel Thermocouple/mV Input User Manual Module. Pub. No. 1746-6.6.1 A more detailed description on how to install and use your SLC 500 Modular Hardware Style Control System.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Hazardous Location Considerations This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. The following WARNING statement applies to use in hazardous locations. WARNING EXPLOSION HAZARD • Substitution of components may impair suitability for Class I, Division 2. • Do not replace components or disconnect equipment unless power has been switched off or the area is known to be non-hazardous.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 5 Overview The thermocouple/mV input module receives and stores digitally converted thermocouple and/or millivolt (mV) analog data into its image table for retrieval by all fixed and modular SLC 500 processors. The module supports connections from any combination of up to four thermocouple or mV analog sensors.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 1747-NT4 Thermocouple Module Hardware Features Channel Status LEDs (Green) INPUT CHANNEL STATUS Module Status LED (Green) 0 1 2 3 Door Label MODULE STATUS THERMOCOUPLE/mV Removable Terminal Block CJC A+ Do Not Remove CHL0+ CJC A± Do Not Remove CHL0SHIELD CHL1+ SHIELD CHL1SHIELD CJC Sensors CHL2+ SHIELD CHL2SHIELD Cable Tie Slots CHL3+ CJC B± Do Not Remove CHL3CJC B+ Do Not Remove ANLG COM Required Tools and Equipment Have the following tools
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SLC™ 500 4-Channel Thermocouple/mV Input Module 7 Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins. Guard against electrostatic damage by observing the following precautions. ATTENTION Electrostatic discharge can degrade performance or cause permanent damage. Handle the module as stated below. • Wear an approved wrist strap grounding device when handling the module.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Fixed Expansion Chassis Considerations IMPORTANT The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) will support only specific combinations of modules. If you are using the thermocouple module in a 2-slot expansion chassis with another SLC I/O or communication module, refer to the SLC 500™Thermocouple/mV Input Module User Manual, 1746-6.6.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 9 To remove the terminal block: 1. Loosen the two terminal block release screws. 2. Grasp the terminal block at the top and bottom and pull outward and down. When removing or installing the terminal block, be careful not to damage the CJC sensors. CJC Sensors Terminal Block Release Screws Max. Torque = 0.7 to 0.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Module Installation and Removal Module Installation Procedure 1. Align the circuit board of the thermocouple module with the card guides located at the top and bottom of the chassis. 2. Slide the module into the chassis until both top and bottom retaining clips are secured. Apply firm even pressure on the module to attach it to its backplane connector. Never force the module into the slot. 3.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 11 Terminal Wiring The thermocouple module contains a green, 18-position, removable terminal block. The terminal pin-out is shown below. ATTENTION Disconnect power to the SLC before attempting to install, remove, or wire the removable terminal wiring block. (Terminal Block Spare Part Catalog Number 1746-RT32) CJC A+ CJC Assembly CJC A- Release Screw Max. Torque = 0.7 to 0.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Thermocouple Junctions There are three types of thermocouple junctions: • Grounded Junction - The measuring junction is physically connected to the protective metal sheath providing electrical continuity between junction and sheath. • Ungrounded Junction - The measuring junction is electrically isolated from the protective metal sheath. (Also called Insulated Junction.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 13 Wiring Considerations ATTENTION The possibility exists that grounded or exposed thermocouples can become shorted to a potential greater than that of the thermocouple itself. Due to possible shock hazard, care should be taken when wiring these types of thermocouples. See page 12 for definitions of thermocouple junctions. Follow the guidelines below when planning your system wiring.
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SLC™ 500 4-Channel Thermocouple/mV Input Module – If millivolt inputs are used, the terminal should be biased to a level within 2V of the signal of interest. Use 10KΩ resistors to create a resistive voltage divider as shown in the following circuit diagram. The Series A 1746-NT4 does not have an ANALOG COM terminal and cannot be used with multiple grounded and/or exposed thermocouples that touch electrically conductive material.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 15 • Tighten terminal screws using a flat or cross-head screwdriver. Each screw should be turned tight enough to immobilize the wire’s end. Excessive tightening can strip the terminal screw. The torque applied to each screw should not exceed 6 - 8 in-lbs (0.7 - 0.9 Nm) for each terminal. • The open thermocouple detection circuit injects approximately 12 nanoAmperes into the thermocouple cable. A total lead resistance of 25 Ω (12.5 one-way) will produce 0.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 4. At the other end of the cable, cut the drain wire and foil shield back to the cable and apply shrink wrap. 5. Connect the signal wires to the NT4 terminal block and the input. 6. Repeat steps 1 through 5 for each channel on the NT4 module. Cold-Junction Compensation (CJC) ATTENTION Do not remove or loosen the cold junction compensating thermistor assemblies located between the two upper and lower CJC terminals on the terminal block.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 17 Module Addressing The following memory map shows you how the output and input image tables are defined for the thermocouple module. Bit 15 SLC 5/0X Data Files Thermocouple Module Image Output Scan Word 0 Address O:e.0 Channel 1 Configuration Word Word 1 O:e.1 Channel 2 Configuration Word Word 2 O:e.2 Channel 3 Configuration Word Word 3 O:e.3 Channel 0 Data Word Word 0 Address I:e.0 Channel 1 Data Word Word 1 I:e.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Channel Configuration Word - Bit Definitions Define To Select Make these bit settings in the Channel Configuration Word(1) 15–12(2) 11 10 9 Data format 7 6 2 1 0 0 0 0 0 0 0 1 Thermocouple Type T 0 0 1 0 Thermocouple Type E 0 0 1 1 Thermocouple Type R 0 1 0 0 Thermocouple Type S 0 1 0 1 Thermocouple Type B 0 1 1 0 Thermocouple Type N 0 1 1 1 ±50mV 1 0 0 0 ±100mV 1 0 0 1 CJC temperature 1 1 1 1 E
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SLC™ 500 4-Channel Thermocouple/mV Input Module 19 Specifications Electrical Specifications Backplane Current Consumption 60 mA at 5V dc 40 mA at 24V dc Backplane Power Consumption 1.3W maximum (0.3W at 5V dc, 1.
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SLC™ 500 4-Channel Thermocouple/mV Input Module Physical Specifications LED Indicators 5 green status indicators, one for each of 4 channels and one for module status Module ID Code 3510 Recommended Cable: for thermocouple inputs Appropriate shielded, twisted-pair thermocouple extension wire(1) for mV inputs Belden #8761 or equivalent Maximum Wire Size Two 14 AWG wires per terminal Maximum Cable Impedance 25 ohms maximum loop impedance, for <1LSB error Removable Terminal Strip Allen-Bradle
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SLC™ 500 4-Channel Thermocouple/mV Input Module 21 Thermocouple Temperature and Millivolt Input Ranges Input Type Temperature Range Thermocouple Type J -210°C to +760°C (-346°F to +1400°F) Thermocouple Type K -270°C to +1370°C (-454°F to +2498°F) Thermocouple Type T -270°C to +400°C (-454°F to +752°F) Thermocouple Type E -270°C to +1000°C (-454°F to +1832°F) Thermocouple Type R 0°C to +1768°C (+32°F to +3214°F) Thermocouple Type S 0°C to +1768°C (+32°F to +3214°F) Thermocouple Type B +300°C
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SLC™ 500 4-Channel Thermocouple/mV Input Module Thermocouple/mV Input Module Accuracy Input Type With Autocalibration(1) Without Autocalibration(1) Maximum Error at +25°C Maximum Error at +77°F Temperature Drift (0°C to +60°C) J ±1.06°C ±1.91°F ±0.0193°C/°C, °F/°F K ±1.72°C ±3.10°F ±0.0328°C/°C, °F/°F T ±1.43°C ±2.57°F ±0.0202°C/°C, °F/°F E ±0.72°C ±1.3°F ±0.0190°C/°C, °F/°F S ±3.61°C ±6.5°F ±0.0530°C/°C, °F/°F R ±3.59°C ±6.46°F ±0.0530°C/°C, °F/°F B ±3.12°C ±5.62°F ±0.
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SLC™ 500 4-Channel Thermocouple/mV Input Module 23 Publication 1746-IN010D-EN-P - June 2004
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