Murphy MDTM89 User's Manual
Contents
1. TC2 Input See Table 1 for wire color code Thermocouple TC1 Input See Table 1 for wire color code A CD Ignition Negative Ground D TO TPI Thermocouple TC2 Input See Table 1 for 7 wire color code Power Power Source Source Typical TTD Hook up J Warranty A limited warranty on materials and workmanship is given with this FW Murphy product A copy of the warranty may be viewed or printed by going to www fwmurphy com support warranty htm FW MURPHY CONTROL SYSTEMS amp SERVICES DIVISION P O Box 470248 Tulsa Oklahoma 74147 USA 1 918 317 4100 Fax 1 918 317 4266 E mail sales fwmurphy com INDUSTRIAL PANEL DIVISION Fax 918 317 4124 E mail ipdsales fwmurphy com MURPHY POWER IGNITION Web site www murphy pi com www fw murphy com In order to consistently bring you the highest quality full featured products we reserve the right to change our specifications and designs at any time P O Box 1819 Rosenberg Texas 77471 USA Phone 281 633 4500 Fax 281 633 4588 E mail sales fwmurphy com Web site www fwmurphy com FRANK W MURPHY LTD Church Rd Laverstock Salisbury SP1 1QZ UK Phone 44 1722 41005 Fax 44 1722 410088 E mail sales fwmurphy co uk Web site www fwmurphy co uk MDTM 8907N page 4 of 4 COMPUTRONIC CONTROLS LTD 41 43 Railway Terrance Nechells Birmingham B7 5NG UK Phone 44 1213 278500 Fax 44 1213 278501 E mail info2. C 12 to 24 VDC negative ground 15 milliwatts FET outputs MDTM89 D 120 VAC MDTM89 C with 120 V isolation module IT 1 FET outputs Model NOT approved by CSA or Factory Mutual Power Consumption CD ignition 350 pa 100V 120 VAC 0 6 watts 24 VDC 0 5 watts Outputs Model B output turns on above trip point output turns off when power is switched off two 2 isolated SCR outputs 0 5 amp 250 VDC Models A C and D output turns on above trip point output turns off below trip point two 2 isolated FET outputs 05 amp 250 VDC Ambient Cold Junction Compensation Range 32 to 122 F 1 C from 0 to 50 C Operating Temperature 4 to 158 F 20 to 70 C TEMPERATURE DISPLAY PUSH TO READ TRIP POINT TRIP PT TRIP pr Storage Temperature 40 to 300 F 40 to 150 C Case Die cast aluminum Reset Differential FET models Decreases 3 Degrees F or C SCR model turn input power off to reset Measurement Range Monitor Range 0 1999 F or C specify F or C in part number Accuracy With J type thermocouple from 150 1200 F 66 649 C 1 5 of reading With K type thermocouple from 400 2000 F 204 1076 C 1 5 of reading At calibration temperature Laboratory Approvals CSA and Factory Mutualt approved for Class I Division 2 Group D hazardous locations Thermocouple Lead Length 150 ohm lead resistance affects moni tor accuracy less than 1 Trip Po
3. Instructions for Installation and Operation Model Series MDTM89 Dual Temperature SWICHGAGE MDTM 8907N Revised 10 07 Section 10 00 02 0165 MURPHY gt Please read the following information before installing A visual inspection before mounting for any damage during shipping is recommended General information and installation instructions are intended for all MDTM89 Series models GENERAL INFORMATION he eS a ee 4 WARNING 4 LD E aw 2 47 BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT V Disconnect all electrical power to the machine V Make sure the machine cannot operate during installation V Follow all safety warnings of the machine manufacturer V Read and follow all installation instructions Description Murphy s model MDTM839 is an electronic dual temperature moni tor It monitors two thermocouples displays the temperature of the thermocouple selected and has adjustable trip points for each input A toggle switch provides for selection of the thermocouple to be dis played and or the temperature trip point to be checked adjusted If either trip point is reached the associated output turns on and can be used as a control signal or to initiate alarms and or shutdown Specifications Power Requirements Operating Voltages MDTM89 A 100 to 350 VDC CD ignition negative ground FET outputs MDTM89 B 100 to 350 VDC CD ignition negative or positive ground SCR outputs MDTM89
4. computroniccontrols com Web site www computroniccontrols com UK 22 ISO 900 Geers FW MURPHY INSTRUMENTS HANGZHOU CO LTD 77 23rd Street Hangzhou Economic amp Technological Development Area Hangzhou Zhejiang 310018 China Phone 86 571 8684 8886 Fax 86 571 8684 8878 Printed in U S A 0889795
5. e thermocouple selected USE ONLY THERMOCOUPLE EXTENSION WIRE 2 If the thermocouple leads are not long enough you will need to use shielded thermocouple extension wire The thermocouple extension wires from your thermocouple lead wires to the terminals of the MDTM839 must be of the same material as the thermocouple lead wires See Table 1 Table 1 Thermocouple Extension Wire Color Code Color Code Material Thermocouple Thermocouple Type Extension Wire Positive Lead Negative Lead J Jx White Iron Red Constantan Red Alumel Table 2 Thermocouple Extension Wire Loop Resistance in Ohms per Foot at 68 F 14 07 146 16 137 230 18 222 374 20 357 586 24 878 1 490 Thermocouple lead length 150 ohm lead resis tance affects monitor accuracy less than 1 MDTM 8907N page 2 of 4 WIRING AND ADJUSTMENT INFORMATION 3 When connecting the thermocouple extension wire to your thermo couple leads twist the wire connections then install wire nuts such as ceramic type which have no metal insert DO NOT SOLDER To prevent problems of interference from electrical noise DO NOT route thermocouple wires in the same conduit or within 12 inches 304 mm of ignition wires or alternating current conductors Metallic overbraided thermocouple wire is recommended It pro vides electrical shielding as well as protection against wear and abrasion B Connecting Thermocouple Wires ung
6. int Accuracy 3 F 2 C of reading Trip Point Adjustment Range 0 1999 Degrees MDTM89 Interface Capabilities Model Power Source Rating LCDT CD Ign 120 VAC 12 24 VDC CLL Div 1 Gr D Haz areas S1400 120 VAC or 12 24 VDC CLI Div 1 Gr D Haz areas CLI Div 2 Gr D Haz areas n Non Hazardous areas MARK II and IV CD Ignition pos or neg grnd TATTLETALE CD Ign 120 VAC 12 24 VDC An isolation barrier is needed between the MDTM89 and an Annunciator rated for Class I Division 1 Group D Hazardous Areas When used with approved ignition Contact Murphy for details When used with approved ignitions or 12 24 VDC Contact Murphy for details Approved for CD ignition 80 250 VDC MDTM 8907N page 1 of 4 MOUNTING DIMENSIONS Mount the MDTM89 temperature SWICHGAGE in a place where it will be protected from rain and splashing water A minimum distance of 12 in 305 mm from any ignition coils or coil leads should be main tained The MDTM89 flush mount case is intended for mounting in a flat panel 032 in 1 mm to 125 in 3 mm thick First cut a 4 3 4 in 121 mm diameter hole and three 4 in 6 mm diameter fastening holes as shown below Insert the SWICHGAGE from the back side of the panel Using the three 10 24 screws included with the SWICHGAGE secure to the panel Front View Side View Back View Mounting Hole Pattern 4 3 4 in 4 1 4 in Screw for Remove Jumper 3 4 i a 121 m
7. m 108 mm Equipment Ground Hel s 4 3 4 in D O 5 lt 4in 102 mm a PY p mm 120 2 39 64 in radius 66 mm 1 4 in 6 mm typical diameter WIRING AND ADJUSTMENT INFORMATION CAUTION Perform the wiring operation with the power source OFF Make sure the voltage and current requirements are within the SWICHGAGE ratings Keep all high voltage wiring such as spark plug wires away from THERMOCOUPLES AND EXTENSION WIRING Before wiring determine the voltage and polarity for the application One Thermocouple Only Even though the MDTM839 is a dual temperature monitor it will monitor and display one temperature with equal results When monitoring one temperature always jumper the unused thermocou ple terminals on the back of the MDTM89 with a short length of wire The unused channel will display approximate ambient temperature Open Thermocouple Input An open thermocouple input forces the monitor into upscale overrange The monitor indicates an overrange by displaying the numeral 1 in the left most digit of the display An overrange will turn on the trip point out put for the respective thermocouple MDTM89 Wiring and Adjustment Instructions A Using Thermocouple Extension Wire 1 After thermocouple installation connect the thermocouple leads to the MDTM839 according to the instructions IMPORTANT Use correct wire for th
8. rounded thermocouple 1 Remove factory installed jumpers or shunts from TC1 and TC2 terminals before connecting thermocouple s 2 Connect the thermocouple leads to the thermocouples Observe lead polarity See Table 1 for thermocouple extension lead color code and thermocouple polarity NOTE Before continuing to the next step decide which thermocouple is to be identified as TCI and which is to be identified as TC2 A wire marker should be installed on each end of the thermocou ple lead to identify TCI and TC2 3 Connect the positive lead of thermocouple TC to the positive terminal of terminal strip TCI 4 Connect the negative lead of thermocouple TC to the negative terminal of terminal strip TCL 5 Connect the positive lead of thermocouple TC2 to the positive terminal of terminal strip TC2 6 Connect the negative lead of thermocouple TC2 to the negative terminal of terminal strip TC2 C Connecting Output Wires Wire the SWICHGAGE trip point outputs as shown in the typical wiring diagrams on the back of this page D Connecting Power Wires 1 Determine the voltage and the polarity of the input power before attempting to connect the power leads to the MDTM89 2 On CD ignitions connect the shutdown lead to the MDTM89 ignition input as shown in the diagrams below Operation Test NOTE Perform the Operation Test after the MDTMS3 is installed and wired appropriately 1 a Rotate the trip point potentiometer
9. s TC1 and TC2 clockwise until an audible click is heard or detente is felt These are 12 turn potentiometers Start the engine or power up the monitor Set the display selector switch to the TC1 position to display the TC1 temperature Next depress and hold the Push to Read trip point push button to display the TP1 setting Rotate the TC1 trip point potentiometer counterclockwise until the display reading is equal to the temperature reading observed in step 2 a Trip point TP1 will turn on and trip the shutdown device or alarm verify by observation Rotate the trip point potentiometer TC1 clockwise several turns to turn off TP1 Reset alarm or shutdown device Set the display selector switch to the TC2 position to display the TC2 temperature Next depress and hold the Push to Read trip point push button to display the TP2 setting Rotate the TC2 trip point potentiometer counterclockwise until the display reading is equal to the temperature reading observed in step 3 a Trip point TP2 will turn on and trip the shutdown device or alarm verify by observation Rotate trip point potentiometer TC2 clockwise several turns to turn off TP2 Reset alarm or shutdown device a o oO ion O a oO ww o Fh 5 O a oO TRIP POINT ADJUSTMENT INFORMATION Trip Point Adjustments 1 Power up the temperature monitor by turning on power or by starting engine 2 Set the displa
10. y selector switch to the TC1 position 3 Depress the Push to Read trip point push button to read trip point 4 Rotate the trip point potentiometer TC1 until the display indicates the desired trip point temperature for TC1 5 Set the display selector switch to TC2 position 6 Depress the Push to Read trip point push button to read the trip point 7 Rotate the trip point potentiometer TC2 until the display indicates the desired trip point temperature for TC2 Face Plate Diagram A Trip point display toggle switch B Readout digital display C Trip point potentiometers D Push to read trip point button 12 turn O potentiometers MDTM 8907N page 3 of 4 TYPICAL WIRING DIAGRAMS Thermocouple TC1 Input See Table 1 for wire color code re V F gt Power Power Source Source Thermocouple TC2 Input See Table 1 for wire color code gt 12 24 VDC Power 120 VAC Power Option NOT approved by CSA or Factory Mutual y 120 VAC 24 VDC a Isolation Module ISOLATION MODULE 24 VDC Negative Ground CD Ignition 100 150 VDC 150 350 VDC 100 150 150 350 a Power Power Source Source Thermocouple TC1 Input See Table 1 for wire color code Thermocouple
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