Related Manuals for Messotron MBI 46.12 Series
Summary of Contents for Messotron MBI 46.12 Series
- Page 1 Operating Instructions Miniature CF Measuring Amplifier Series MBI 46.12 Version 2.1 en MBI 46.12 operating instructions.docx Issue date: 08/2022 Page 1 of 32...
- Page 2 Version 2.1 en MBI 46.12 operating instructions.docx Issue date: 08/2022 Page 2 of 32...
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Page 3: Table Of Contents
Contents 1 Contents ....................4 1.1 Warranty and liability ................ 4 1.2 Technical support and contact details ..........4 2 Safety Instructions ................5 2.1 Intended use ..................5 2.2 Conditions at the installation site ............5 2.3 General hazards if the safety instructions are not followed ....5 2.4 Qualified personnel ................ -
Page 4: Contents
1.1 Warranty and liability Warranty and liability claims against MESSOTRON cannot be raised if • damage occurs because the operating instructions are not followed or • modifications have been made that are not documented in the operating instructions. -
Page 5: Safety Instructions
The limits for the device are specified in chapter 11 “Technical Specifications”. Have the device checked by MESSOTRON before putting it back into service if foreign objects or liquids got inside the device. Do not use the device near other devices, machines or equipment that generate strong electric or magnetic fields. -
Page 6: Check For Transport Damage
In this case, have the device checked by MESSOTRON before use. 3 Warning and Other Messages 3.1 Use of warning messages... -
Page 7: Other Messages
Types of displacement sensors In these instructions the term “displacement sensor” Displacement often abbreviated to “sensor” is used. These devices are sensor also known as “transducers” or “position sensors”. MESSOTRON differentiates following three displacement sensor types: Differential Differential transformers consist of a primary coil and two transformer secondary coils placed around a movable magnetic core. - Page 8 Term Definition Inductance Transducer). Long-stroke Long-stroke sensors are inductive displacement sensors sensors based using a half-bridge circuit. Only one coil is used for eddy measuring. The second coil is designed as a space- current saving equivalent circuit. A movable measuring tube principle (made of a conductive material) changes the impedance of the measuring coil based on the eddy current...
- Page 9 This phase shift lowers the (effective) sensitivity of the sensor in the measuring chain. All MESSOTRON series MBI 46.12 measuring amplifiers can compensate a phase shift. Linearity error The linearity error of measuring devices is the maximum deviation between the nominal characteristic (straight line) and the real characteristic of the measuring device.
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Page 10: Function And Design
Term Definition (Nominal) The (nominal) output range of the measuring amplifier output range indicates the range covered by the output signal, if the displacement sensor operates (nominal) measuring range. Voltage output Analog voltage output of the measuring amplifier: typically ±10 V for symmetric displacement sensors typically 0...10 V for asymmetric displacement sensors... -
Page 11: Suitable Displacement Sensors
P Ph ±10 V 0 ... 10 V Filter Oscillator Option high 15 V 24 V Figure 1 Block diagram with terminal assignment Trimmer potentiometer for gain adjustment Trimmer potentiometer for zero adjustment Trimmer potentiometer for phase compensation Resistor for setting the trim range for the zero point Resistor for basic configuration of gain 4.3 Suitable displacement sensors The MBI 46.12 CF measuring amplifier can be used with a variety of... - Page 12 The following chapters describe 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 inductor principle, also called LVITs, represent a Wheatstone half-bridge consisting of two measuring coils. If the core moving inside the coils is in its mid- position (electrical zero), both measuring coils will show the same impedance.
- Page 13 4.3.2 Linear Variable Differential Transformers (LVDT) Differential transformers consist of a primary coil 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 immersion core is at its mid-position, this voltage is zero due to the symmetrically wound secondary coils.
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Page 14: Overview Of Types And Options
Schematic circuit diagram ° of CF amplifier ° Oscillator Measuring tube Filter Meas ° Figure 4 Measuring amplifier with long-stroke sensor 4.4 Overview of types and options The measuring amplifier is available in the following versions: MBI 46.12/ x y /zzz Power supply Options... -
Page 15: Placing Into Service
5 Placing into Service NOTICE NOTICE Only qualified skilled persons are allowed to place the measuring amplifier into service. NOTICE Electrostatic discharge at electronic assemblies can damage the components before they are placed into service. Therefore, take all necessary measures to avoid electrostatic charging (ESD protective measures). - Page 16 Plug strand strand 2 (B) 3 (C) (BN) 3 (C) 2 (B) 4 (D) WH+YE 1 (A) 1 (A) Figure 6 Connection of MESSOTRON displacement sensors Version 2.1 en MBI 46.12 operating instructions.docx Issue date: 08/2022 Page 16 of 32...
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Page 17: Setting Options Of The Measuring Amplifier
• a reference displacement sensor, if the sensor type is known, • the sensor specification provided by the customer, • the sensor that may have been ordered at MESSOTRON together with the amplifier or • a typical adjustment, if the sensor is unknown. - Page 18 Figure 7 Correction of the zero point The electric output signal of a real inductive displacement sensor is not always exactly zero at the mechanical zeropoint (Dimension A for MESSOTRON displacement sensors). Material manufacturing tolerances may cause small deviations, which can be compensated using the zero-point potentiometer.
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Page 19: Adjustment Using Trimming Potentiometer
The phase compensation of the MBI 46.12 shifts the evaluation of the measurement voltage on the time axis in such a way that the phase position caused by the displacement sensor is compensated and the full sensitivity of the displacement sensor can be used. 5.2.3 Gain To obtain the desired output signal, the gain of the measuring amplifier must be set depending on the rated output of the displacement sensor... - Page 20 The measuring amplifier will only show its nominal characteristics NOTE after a warm-up time of approximately 15 minutes. Gain potentiometer Phase Zero-point potentiometer potentiometer Figure 10 Location of trimming potentiometers 5.3.1 Adjustment for symmetric displacement sensors With symmetric displacement sensors, the electrical zero is at the center of the nominal stroke.
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Page 21: Basic Configuration Of Measuring Amplifier
the same value with the usual connection as well as with switched excitation wires (terminal 5 and terminal 7). • To adjust the phase, move the core to a position just before the end of the (nominal) measuring range. Then set the maximum of the output signal using the phase potentiometer P . - Page 22 MESSOTRON only). To change the basic configuration, solder in fixed resistors. Bevor changing the basic configuration make sure, that the gain potentiometer is in its mid-position. If you cannot do the basic configuration on site, you can also NOTE have the conversion done at the factory.
- Page 23 The required resistance value for the offset or extension depends, among other things, on the adjusted amplification of the measuring amplifier. It is advisable that you use a resistance decade box to dimension the resistor . Connect it to the soldering terminals of the resistance to be determined. Then select a suitable fixed resistor for R (±5 %) and solder it to the soldering terminals provided.
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Page 24: Optimizing The Linearity Characteristic Of The Measuring Chain
In this case, please send the device - together with specification of the required gain or with the rated output of the sensor used - for modification to MESSOTRON. 5.5 Optimizing the linearity characteristic of the measuring chain The procedure for basic settings and adjustment described in the previous chapters applies to a measuring chain with an “ideal displacement sensor”... - Page 25 the measuring range considered is 0,5 %. It is zero in the middle and at the end of the measuring range. Graph 1 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 5 10 15 20 25 30 35 40 45 50 -0,1 -0,2 -0,3...
- Page 26 Figure 14 Ideal zero point, max. linearity error reduced to 0.32 % • To do so, reduce the gain in small steps. This causes a “rotation” of the linearity curve around the zero point. The zero-error setting at the end of the measuring range is given up.
- Page 27 To set the measuring amplifier according to these instructions, NOTE the linearity curve of the displacement sensor must be determined. As an option for all MESSOTRON displacement sensors, you can receive test reports with the linearity curve (according to 5.5.1).
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Page 28: Operation
Never try to repair a defective measuring amplifier. Repair attempts 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 operation. -
Page 29: Maintenance
• To clean the enclosure, only use a soft, slightly moist cloth. • Remove dry dirt from PCBs carefully using a vacuum cleaner or a brush. • If foreign liquids get inside the device, have it checked by MESSOTRON before putting it back into service. -
Page 30: Declaration Of Eu-Conformity
10 Declaration of EU-Conformity Version 2.1 en MBI 46.12 operating instructions.docx Issue date: 08/2022 Page 30 of 32... -
Page 31: Technical Specifications
11 Technical Specifications General information Operating temperature 0...60 °C Storage temperature -25...85°C Electromagnetic compatibility DIN EN 61326-1 Measuring amplifier Linearity error < 0,1 % FSO Carrier frequency 5 kHz ±5 % (sine); optional 1...20 kHz Excitation voltage (primary) approx. 2 V @ 5 kHz, sinusoidal max. - Page 32 Subject to alterations. Errors and omissions expected. © 2022, MESSOTRON GmbH & Co KG MESSOTRON GmbH & Co KG Friedrich-Ebert-Str. 37 64342 Seeheim-Jugenheim Phone 06257 999 730 Email: info@messotron.de Homepage: www.messotron.com Version 2.1 en MBI 46.12 operating instructions.docx Issue date: 08/2022...
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