Messotron MBI 46.31 Series Operating Instructions Manual Download

Page: 1 / 42

Version 2.1

en MBI 46.31 operating instruction.docx

Issue date: 01/2022

Page 1 of 42

Operating Instructions

CF Measuring Amplifier

Series MBI 46.31

MBI 46.31

Eurocard PCB with

front panel

MBI 46.31

In field housing

Summary of Contents for MBI 46.31 Series

Page 1: ...2 1 en MBI 46 31 operating instruction docx Issue date 01 2022 Page 1 of 42 Operating Instructions CF Measuring Amplifier Series MBI 46 31 MBI 46 31 Eurocard PCB with front panel MBI 46 31 In field h...

Page 2: ...ription 6 4 1 Glossary 6 4 2 Function and design 9 4 3 Suitable displacement sensors 11 4 4 Overview of types and options 14 5 Placing into Service 18 5 1 Pin assignment 18 5 2 Setting options of the...

Page 3: ...d safety instructions Observe the warnings and safety instructions in these operating instructions to avoid physical injury and property damage 1 1 Warranty and liability Warranty and liability claims...

Page 4: ...at the installation site Check the required conditions at the installation site e g temperature and weather conditions The limits for the device are specified in chapter 11 Technical Specifications H...

Page 5: ...hazardous situation which if not avoided will result in death or serious injury Indicates a hazardous situation which if not avoided could result in death or serious injury Indicates a hazardous situ...

Page 6: ...evices are also known as transducers or position sensors MESSOTRON differentiates the following three displacement sensor types Differential transformer LVDT Differential transformers consist of a pri...

Page 7: ...n enabling a more favorable displacement to length ratio The electrical zero is at the start of the nominal stroke when the measuring tube completely covers the measuring coil Immersion core core with...

Page 8: ...rm nominal output is used Sensitivity The sensitivity is defined as the ratio of the measurement voltage to the excitation voltage per mm of displacement e g 10 mV V mm For standardization purposes in...

Page 9: ...10 V for asymmetric displacement sensors 4 2 Function and design The MBI 46 31 generates the AC voltage excitation voltage Usp required for operating inductive displacement sensors The frequency carri...

Page 10: ...rimmer potentiometer for gain adjustment P0 Trimmer potentiometer for zero adjustment PPh Trimmer potentiometer for phase compensation R2 Resistor for setting the trim range for the zero point R6 R7 R...

Page 11: ...cribe the electrical design of the three displacement sensor types offered by MESSOTRON 4 3 1 Linear Variable Inductance Transducers LVITs Electrically displacement sensors based on the differential i...

Page 12: ...and two secondary coils placed around an immersion core The coils are coupled based on the transformer principle AC voltage drives the primary coil inducing a voltage in the secondary coils When the i...

Page 13: ...ivalent circuit A movable measuring tube made of a conductive material changes the impedance of the measuring coil based on the eddy current principle In contrast to symmetric displacement sensors the...

Page 14: ...0 V 1 output signal 0 10 V 24 VDC 3 3 Eurocard PCB with front panel 10 V output connector 0 20mA output signal 0 20 mA 4 Eurocard PCB with front panel 4 20 mA output connector 5 Eurocard PCB without f...

Page 15: ...s 3 U or other suitable housings When installing the measuring amplifiers make sure there is sufficient distance between the amplifiers and electrically conductive parts Depending on the version the E...

Page 16: ...nnected to terminal blocks for pin assignment see chapter 5 1 The cable shield is not connected at the measuring amplifier If required connect the cable shield at the other cable end Field enclosure w...

Page 17: ...V 15 V 15 V I Option Ua 0 V 2 Option 2 3 4 5 6 7 8 9 10 11 12 Displace ment sensor Weight app 2 kg not used 4 C Figure 8 Enclosure dimensions and position of components for 230 VAC supply The power su...

Page 18: ...low capacitance cable Do not route the cable in parallel with power lines In addition maintain a sufficient distance to electric drives transformers and frequency converters 5 1 Pin assignment NOTICE...

Page 19: ...ifier input measuring signal ac 10 12 0 V ac 12 11 BK Supply voltage 24 V low ac 14 10 not used ac 16 9 not used ac 18 8 not used ac 20 7 not used ac 22 6 RD Supply voltage 24 V high ac 24 5 RD Voltag...

Page 20: ...4 RD RD 1 A ac 8 13 BK BK 4 D WH YE WH 1 A WH A Figure 12 Connection of MESSOTRON displacement sensors 5 2 Setting options of the measuring amplifier The measuring amplifier must be adapted to the dis...

Page 21: ...uned at the MESSOTRON factory if a sensor is ordered together with the measuring amplifier 5 2 1 Position of the electrical zero point The electric output signal of a real inductive displacement senso...

Page 22: ...uctuations of the excitation voltage If the phase shift is not compensated the sensitivity of the sensor may deviate Figure 14 Phase shift Figure 14 shows that there is a reduced voltage ratio of UM1...

Page 23: ...placement to output signal characteristic curve or a counter clockwise rotation of the characteristic curve 5 3 Adjustment using trimming potentiometer Make sure that the basic configuration of the me...

Page 24: ...its nominal characteristics after a warm up time of approximately 15 minutes Figure 16 Location of trimming potentiometers 5 3 1 Adjustment for symmetric displacement sensors With symmetric displaceme...

Page 25: ...to the desired value adjust the gain if necessary To adjust the gain move the core to the end of the nominal measuring range and use the gain potentiometer PE to set the voltage to the desired value u...

Page 26: ...suring amplifier with 230 V supply voltage type 46 31 2x Touching live parts can result in death serious injury or considerable property damage Soldering work must only be done by qualified skilled pe...

Page 27: ...he following figure Figure 17 Location of setting components Only use resistors with a small temperature coefficient TK25 or TK50 5 4 2 Setting the phase compensation The capacitors C1 and C2 are used...

Page 28: ...of the output range is required The offset resistors R6 negative offset of output signal and R7 positive offset of output signal are provided for this purpose Figure 18 Do a phase compensation before...

Page 29: ...fier Then select a suitable fixed resistor R6 or R7 5 and solder it to the soldering terminals provided 10 5 0 5 10 50 0 50 Displacement in FSO Output voltage in Volt Output signal without offset usin...

Page 30: ...zes the temperature related error Normally the output range of the measuring amplifier is set to 4 20 mA current output or 0 10 V or 10 V voltage output for the nominal stroke of the displacement sens...

Page 31: ...er JU1 in plug position J2 Instead of RE connect a resistance decade box Move the trimming potentiometer PE to the mid position Set the displacement sensor to the end of the used measuring range Use t...

Page 32: ...an be further optimized taking into account the respective measuring task Figure 19 shows the typical linearity characteristic of a symmetric displacement sensor as determined following the setting of...

Page 33: ...is given up Figure 22 Ideal zero point max linearity error reduced to 0 32 5 5 2 Minimal error over the entire measuring range Some measuring tasks do not require a certain measuring point to show a...

Page 34: ...ations Figure 24 Zero error setting at the beginning end of the measuring range 0 3 0 2 0 1 0 0 1 0 2 0 3 0 4 50 45 40 35 30 25 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 Displacement in Linearity erro...

Page 35: ...point 5 6 Improving the noise rejection The MBI 46 31 CF measuring amplifier series is suitable for use in highly dynamic applications As delivered the 3 dB dynamic bandwidth is 1 10 of the carrier fr...

Page 36: ...of any kind will immediately render warranty and liability claims invalid MESSOTRON electronics are designed for use in a rough industrial environment They are designed for years of trouble free oper...

Page 37: ...c assemblies can damage the components before they are put into service Therefore take all necessary measures to avoid electrostatic charging ESD protective measures When cleaning note the following T...

Page 38: ...Version 2 1 en MBI 46 31 operating instruction docx Issue date 01 2022 Page 38 of 42 10 EU Declaration of Conformity 10 1Electronics with a supply voltage 50 V...

Page 39: ...Version 2 1 en MBI 46 31 operating instruction docx Issue date 01 2022 Page 39 of 42 10 2 Electronics with a supply voltage 50 V...

Page 40: ...12 mArms Input resistance secondary approx 200 k Output signal 4 20 mA impedance 500 or 10 VDC ballast resistor 10 k Noise level and residual carrier voltage 5 mVrms Temperature coefficient of zero p...

Page 41: ...enclosure 15 V 24 V Supply voltage 15 VDC stabilized or 20 36 VDC Power consumption max 2 W Electrical connection Terminal block internal connecting cable for supply voltage displacement sensor and o...

Page 42: ...te 01 2022 Page 42 of 42 Subject to alterations Errors and omissions excepted 2022 MESSOTRON Hennig GmbH Co KG MESSOTRON GmbH Co KG Friedrich Ebert Str 37 64342 Seeheim Jugenheim Germany Phone 49 6257...

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