Model 5600 User`s Manual
Contents
1. Model LMU 209 Load Monitoring Unit 1 0 1 1 INTRODUCTION Figure 1 LMU 209 Load Monitoring Unit DESCRIPTION The LMU 209 Load Monitoring Unit is a high precision ultra stable DC measuring amplifier that is capable of various low level mV signals The LMU 209 offers two calibrated outputs a voltage output and a current output both according to the industrial standard Coarse gain and offset range are selected with easily accessible DIP Switches Fine tuning can be accomplished by adjusting the 10 turn potentiometers An additional low pass filter reduces bandwidth and helps to improve signal noise ratio The bridge power supply can be selected between 5 V or 10 VDC The current 1 2 output is configured from 0 20 mA or 4 20 mA without any calibration TECHNICAL SPECIFICATIONS Supply 18 28 V 70 mA Ripple Voltage max 1 Vpp 50 Hz Voltage Output O to 10 V Rload 3 kQ Current Output 0 4 20 mA Rload 0 800 Q Operating Temperature Range 20 to 60 C Housing Dimensions 44 x 74 x 51 4 mm Housing Material PA UI94 V 0 polycarbonate aluminum option Protection Class Weight IP 52 polycarbonate or IP 65 aluminum 100 g EMC Tests EN 61000 4 Frequency Response 0 500 Hz 3 dB F R with selectable low pass filter 0 3 kHz 3 dB Sensitivity default 1 mvV V Sensitivity Ranges Range 1 0 5 to 1 5 mV V Range 22. 1 5 to 4 0 mV V User s Manual Magtrol Model LMU 209 Load Monitoring Unit Adjustment Sensitivity 10 turn potentiometer Zero Adjustment Ranges 75 to 75 in 5 ranges Zero Fine Adjustment 10 turn potentiometer Bridge power supply 5 10 VDC selectable Input resistance Sensor 5V 120 Q to 10 kQ 10V 330 Q to 10 kQ 100 10 V or 20 mA 0 8 Calibration Signal Noise max 20 mVpp Linearity Error 0 05 TC Zero lt 0 01 C 2 0 SAFETY USE CAUTION AND READ THIS OPERATING MANUAL THOROUGHLY BEFORE BEGINNING YOUR INSTALLATION PROCESS SETUP CONFIGURATION AND OPERATION OF THE LMU 209 SHOULD ONLY BE CONDUCTED BY QUALIFIED PERSONNEL 2 1 Proper Use oF EQUIPMENT e The LMU 209 Load Monitoring Unit must not be used in life supporting applications e The LMU 209 Load Monitoring Unit must not be used in safety critical applications 2 2 SAFETY PRECAUTIONS Non compliance with the safety regulations could result in serious damage to the unit e Always separate the signal lines from power lines drives converters and never interrupt the signal lines unless using designated junction boxes e Attach the cable shield braid at both ends to a proper ground Do not allow a ground current to flow over the cable shield e Attach all machine parts to one well defined potential by using large copper wires Allowing different potentials will create currents tha
3. output will also go to 100 Definition Usur 0to 10V lir 0 20 mA or 4 20 mA Magtrol Model LMU 209 Load Monitoring Unit User s Manual 4 5 Grounpine HFE The LMU 209 provides outstanding EMC capabilities but still needs to be connected to an earth ground This connection should be made with a short wire with at least AWG22 If an earth ground is not possible attach this connection to 0 V or a mounting plate or case Make sure that the HFE is connected to a proper earth ground to sink the energy which is absorbed by the EMC circuit integrated in the LMU 209 4 6 Power Bridge power can be selected between 5 V DC or 10 V DC As a general rule low impedance sensors should be driven with 5V whereas high impedance sensors can be operated with 10V If in doubt select the lower supply voltage This helps to reduce sensor overheating 4 7 6 WIRE TECHNIQUE Contact Magtrol SA for additional information 4 8 Low Pass FILTER The onboard low pass filter is switched on and off by toggling the appropriate DIP Switch It is recommended to reduce the bandwidth because it eliminates high frequency noise and gives more stability to the readings If an application needs more speed switch off the low pass filter in order to achieve a bandwidth up to 3000 Hz 5 0 MAINTENANCE Any repairs should be performed exclusively by Magtrol Ist Edition January 2009 Testing Measurement and Control of Torque Speed Power Load Force Weig
4. MU 209 CALIBRATION The LMU 209 contains a calibration button for quick and easy calibration By pressing the CALIBRATE button the LMU 209 creates an internal signal of 1mV V to the input Calibration procedure 1 Calculate the sensor signal in mV V for a 10V output span Connect the sensor to the LMU 209 Adjust the output to 0 00 V with the ZERO potentiometer see Figure 6 Press the CALIBRATE button see Figure 6 Adjust the voltage output with the 10V potentiometer see Figure 6 ad en sell Sad according to the following formula 10V x 1 mV V Sensor signal mV V U Volt OUT Example A 5 kN force sensor should measure a force of 3 5 kN whereas this sensor is specified with 2 00 mV V at 5KN Therefore the sensor s output will be 1 40 mV V at 3 5 KN According to the formula above the output needs to be adjusted to 7 143 volts when the calibration button is pressed After this the LMU 209 will deliver 10 00 V or 20 mA at the outputs when the sensor is loaded with 3 5 KN The voltage output can handle bipolar signals and will therefore also deliver 10 V In the example above negative forces can also be measured as long as the sensor itself is designed to do so CURRENT OUTPUT The LMU 209 offers two simultaneous calibrated outputs a voltage output and a current output The relationship between these two outputs is strictly proportional In other words if the voltage output is forced to 100 the current
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6. nse Figure 4 Connection of Resistive 6 wire Sensor contact Magtrol SA for information Auxiliary Load o O Excitation ZS sense P Signal w Signal B Sense a Excitation a 15V Figure 5 Use of LMU 209 Auxiliary Power 3 2 DIP SwitcHes OFF Position DIP Switches ON Position Excitation 10V N A N A N A N A N A N A N A Cut Off Frequency 3 kHz Zero Current Out 0 mA d m SUA CIE Miom 2 aim ifo m 100 m Ainm gt CUI gt Gio p 7 Y Cre Pa Excitation 5 V Sensitivity Range 1 ON Sensitivity Range 2 ON Offset Range 50 20 Offset Range 25 20 Offset Range 0 20 Offset Range 25 20 Offset Range 50 20 Cut off Frequency 500 Hz Zero Current Out 4 mA Magtrol Model LMU 209 Load Monitoring Unit User s Manual 3 2 1 4 0 4 1 Default Position SW 1 ON 5V Excitation SW 2 ON Range 1 selected SW 3 OFF SW 4 OFF SW5 OFF SW 6 ON Offset adjusting range 0 20 SW7 OFF SW 8 OFF SW 9 ON Bandwidth is limited DC 500 Hz SW 10 ON Current Out 4 20 mA OPERATION The LMU 209 is designed to amplify low level signals from force pressure or strain sensors based on strain gauge principles After supplying the LMU 209 with power it is immediately ready for measuring and will deliver a meas
7. t cannot be controlled 3 0 INSTALLATION For quick and easy installation select the operating mode as shown in default position section 3 2 1 CAUTION 3 1 ConneEcTION DIAGRAMS MAKE SURE THE SWITCHES ARE IN THEIR CORRECT END POSITION IF IN DOUBT TOGGLE THE SWITCH AGAIN WITH THE APPROPRIATE TOOL CONFIGURATION CAN BE DONE IN THE POWERED OPERATE MODE Magtrol Model LMU 209 Load Monitoring Unit User s Manual 3 1 1 Supply Connection and Signal Output Connection Ub 1 Power supply 18 28 V OV 2 Power supply 0 V Ground Uout 3 Calibrated voltage output lout 4 Calibrated current output OV 5 Signal 0 V for Usur and lour 24VDC Q OVPWR U Out Ou 1Out O gt OV Signal O wn Figure 2 Connection to Power and Control Unit 3 1 2 Sensor Connection 15V 16 Auxiliary supply output for external sensors draw max 20 mA E 15 Positive bridge excitation 5 V 10 V Sen 14 Sense input 6 wire technique S 13 Positive signal input S 12 Negative signal input Sen 11 Sense input 6 wire technique E 10 Negative bridge excitation 0 V Earth 9 Connection for grounding o HFE oQ Excitation 2O P Signal D Signal rO m Excitation a 15V Figure 3 Connection of Resistive 4 wire Sensor User s Manual Magtrol Model LMU 209 Load Monitoring Unit oo HFE oQ Excitation ZO Sense P Signal D Signal EO Se
8. uring signal at the signal outputs which is in perfect proportion to the input signal coming from the connected sensor Depending on the sensor s offset it may be necessary to adjust the potentiometer ZERO OFFSET CALIBRATION The LMU 209 is optimized for static measurement as in force measuring and weighing applications If an exact proportional signal without any offset or zero errors is desired the zero of the whole measuring chain has to be adjusted after installation If the zero error is within a few percent this error can be adjusted by using the zero potentiometer However if the zero offset is larger the DIP switches can be used to adjust the range The DIP switches can also be used to adjust for preload or packaging weights ZERO potentiometer 10V potentiometer Calibrate Calibrate button gt Pop Owy x sexsors 7 01 2006 A ma Figure 6 DIP switches and Zero Potentiometer User s Manual Magtrol Model LMU 209 Load Monitoring Unit 4 2 ADJUSTING INPUT SENSITIVITY The default input sensitivity of the LMU 209 is adjusted to ImV V in conjunction with a bridge supply power of 5 V To adapt the LMU 209 to other signals other ranges are easily selectable with the DIP switch or by adjusting the calibration with the potentiometer in large ranges CAUTION ADJUSTING THE CALIBRATION WILL RESULT IN A LOSS OF FACTORY CALIBRATION THEREFORE ONLY QUALIFIED PERSONNEL SHOULD 4 3 4 3 1 4 4 RECALIBRATE THE L
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