ICA1, ICA2 Instruction Manual
Contents
1. ICA1 amp ICA2 S and H Versions Strain Gauge or Load Cell Embedded Analogue Amplifier User Manual www mantracourt co uk nll mantracourt ICA1 and ICA2 S and H Versions Manual Contents Introduction to the ICAS and ICAH Range of In Cell Amplifiers sesesecececsesececececsesecececeesececececcesececeoeeo 2 Chapter 1 rhe ICAS and HiRAn e iescoe ied oreadertomedt oie eedotay wade Gino bode ead b nade a Ges odes a a E 3 Foure TI BOCK Di AST MN usecase scale sae eh lalla at ne elu aches a la a DU a alain ace e i lula ei a a Pa a a Ma Daa ohn a Maleate 3 Chapter 2 Installing the ICA1 and ICA2 S and H sessesesesesecsecececececsecececececsecececececsececececeesececececeeseseoeo 4 Pro TASCA MATION aeoeaiei EEOAE AEE CEECEE EA OENE EEEE OIE EEEE E EIEEE EEEREN 4 Fide 2 T DIMENSIONS woconen a A EE A E E a a out a a a e e 4 POwWer CONNEC ELON sores i ene nea EA E T Sane E E 4 Figure 2 2 Connection Details for the ICA1 and ICA2 sesessssesessesesesoeseseecesesceceseeceoeeceoesesororeeeoeeeseroseeeo 5 Figure 2 3 Connection Details for Best EMC Immunity sessssesessesesescsecessecesesceceseeceorecsoeoeeosoreeeceeesoroseeeo 5 TADE Ze oneee EE E EEE EEEE EE EEEE 6 OUT UE COMMCCHIONS ene AEE OA E E N E EAE E TAE AN T 6 Chapter 3 Calculating the gain resistor value sesesesssosoessseoeoeoeoeoeoeoesesosososososososoeoeoeoeoeoeoesesesesosoeo 7 Table Sel ICAT AO TV tO IO INV iera enuie na e ERE E OEA OENE EEEE OUAR EE ARO 72. Tabte 32 ICAZ 01V tO DTV aeron EE E parades na serial EE EEEE E EEEE EE 7 Table 3 3 ICAT and 2 Offset Resistor sscrcrsadacedaccewedianiai ac adacceweeniad O E E E we anew ees 7 Chapter 4 CaliDration cdsicascetsccercde cece TE E ENEE T EE IEA 8 Figure 4 1 Connection Details Tor Calibration cccsedcihesnaitiiesvabestaseal eds ee ea a e a a aa 8 Chapters Trouble SHOOUING sriuisinisssssroissanna a a a a a aaa 9 Chapter 6 Product ANC urreni eena E O EEE 10 Chapter 7 GlOSSary casi sictvscisbccvarnasds vasa TA AAAA A T 11 Chapter 8 Specifications for the ICA1 and ICA2 S and H sesessesesesesecscsecececececsececececsecsecececesecsesecececeeseoe 13 Ttable S TICAS and ICATH 10 1T to 101V Jennerin oes E E E E vars E E EE E E 13 Electricatand ENVIrOnNMENta l sccceiscasincetwan er EE N A ETEO A E AE E AOE E E ee TE 13 MESU NE a a E A A E es scaee a atcaee 13 Tabie 2 ICAZS and ICAZA 0T TO DAIN ieia E eaten ETE AEO ETEO OTARA 14 ELV IFO CLA Uei roren eE onic tac EEE E EEOAE EE EENE ENAN 14 Mea IRS UNS E aaa hole Geaten viel acter A hate Si iain a atta te Mei A tie dea 14 CE ADDI OV ANS es ceca tacceccenacasecesaesecocess csscesaeseaecusocuccusae senenuse caceesaecacene E EA 14 Other MantracoOure Products iiscss fasescvccexcenac he EA EE T E S 15 1 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Introduction to the ICAS and ICAH Range of In Cell Amplifiers Two new families the ICAS industrial stability and ICAH high stabili
3. Temperature compensated Unwanted Signal noise filter Sensor specific calibration Elimination of induced noise on signals s ISO 9001 REGISTERED FIRM THE QUEEN S AWARDS SLZ CE Inthe interests of continued product development Mantracourt Electronics Limited reserves the right to alter product specifications without prior notice Doc No 517 175 Issue 1 3 17 10 12 15 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual
4. otherwise known as a Signal Conditioner The ICA provides a wide range of signal conditioning for Strain Gauges Load Cells Pressure and Torque Transducers Offered in 6 versions and two performance categories ICAS and ICAH The ICAH offers lower drift over the operating temperature range ICA1 3 wire 0 1 to 10 1V ICA2 3 wire 0 1 to 5 1V ICA3 4 wire 10V 15V supply ICA4 3 wire 4 to 20mMA ICA5 2 wire 4 to 20mA ICA6 3 wire 10V 15 24V supply This manual only deals with Versions ICA1 and ICA2 S and H separate manuals exists for versions ICA3 and 6 ICA4 and ICA5 Transducer SENSITIVITY of between 0 5 mV V and 150mV V are possible It is optimised to 2 5 mV V This range covers most but not all strain gauges Sensitivity adjustment is achieved by a combination of gain span resistor R change and associated fine adjustment by potentiometer Similarly transducer ZERO can be compensated for in the module This adjustment is to compensate for slight errors in the strain gauge and not to offset tare Mantracourt s SGA Strain Gauge Amplifier covers a range from 0 06 mV V to 30mV V and it s 79 offset can provide tare compensation 3 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Chapter 2 Installing the ICA1 and ICA2 S and H Pre Installation See Specification details in Chapter 8 for details of Environmental Approvals Carefully remove the ICA unit from it
5. sensitivities the gain resistor Rgain shown in Figure 2 2 can be changed according to the following formula N B a high quality component e g 1 25 ppm metal film resistor should be used for optimum performance the H versions should use 10 15 ppm metal film devices It may be necessary to use a value from the less common E96 series to optimise the trim range Table 3 1 ICA1 0 1V to 10 1V Gain 372 Rgain 40 000 Ohms required mV V Gain 1 e g 1 For 2 5 mV V Gain 149x R 270 Ohms Use preferred value 270R Factory setting e g 2 For 0 5 mV V Gain 744x R 53 8 Ohms Use preferred value 53 6R E96 series Table 3 2 ICA2 0 1V to 5 1V Gain 186 Rgain 40 000 Ohms required mV V Gain 1 e g 1 For 2 5 mV V Gain 74 4x R 545 Ohms Use preferred value 549R E96 series Factory setting e g 3 For 5 0 mV V Gain 37 2x R 1105 Ohms Use preferred value 1K1 Table 3 3 ICA1 and 2 Offset Resistor The ICA1 and 2 can be used in a pseudo bipolar mode by fitting a resistor Roffs as shown in Figure 2 2 This will shift the output voltage to a known level Voffs when the input is zero OmV V allowing both tension and compression of the load cell to be measured Use the following formula for the ICA1 and 2 to calculate the value of Roffs in k Ohms Roffs 148k Voffs 0 1 e g for 2 5V offset bipolar ICA2 Roffs 148k 148k 61 7k Ohms Use preferred value 61 9k E96 ser
6. is not normally a problem It is most likely to be incorrect connections and as such the output would be high and fixed a Check the sensor is connected typically reading 350 Ohm across output amp with the power off b Check the Excitation voltage is at 5V dc c Check the Zero offset d Check the calibration 4 Unstable Output This is when the output is unstable or varies The cause could be a poor installation or b a noisy environment Poor Installation This is when an output is present but higher or lower in span or zero than expected a Check the installation for problems and repair where necessary b Poor termination c High resistance on cable leads d Low insulation impedance e Proximity to High Voltage Equipment Transformers Contactors Motors etc Noisy Environment a Check if the source can be found and remove noise b Check the cable shielding and ensure it is correctly installed and terminated 5 Calibration This section assumes that the unit is providing an output that is not stuck at top or bottom of the scale See paragraphs 1 3 if this is the case Ensure you are connected to the correct sensor and not to another adjacent unit Ensure you have the correct calibration data from the sensor manufacturer This must include a certified table with offset zero and linearity Ensure you have the calibration set up correctly installed i e mV source and output as required Ensure the temperature a
7. ation Set Sensitivity and Low pass filter and output Simple Reliable Rugged LCA IN LINE INTELLIGENT STRAIN GAUGE AMPLIFIER e 2 Set Points 4 to 20 mA AND O to 10 V isolated outputs RS 232 485 Communications port On Board easy to use Programmer Auto tare Auto calibrate and much more RCA15 RACK MOUNTED INTELLIGENT STRAIN GAUGE AMPLIFIER Complete MULTI CHANNEL system for Strain gauges Relay and or serial outputs per channel Multidrop serial link 19 Eurorack x 3U high Capability similar to the ADW 15 High integrity compact Data acquisition unit ADW15 Mantraweigh 72 mm DIN Module Display amp Controller 10 mm LED Display Configurable Sensitivity from 0 5 mV to 200 mV V 10 V 150 mA Excitation Isolated 1 0100mSec sample rate Set Point Relays 4 to 20 mA Output Programmable via keypad FIELDBUS CONNECTIVITY IN TWO EXCELLENT PACKAGES DSC The Digital Strain Card D Cell The in cell Digital Strain Puck Se S24 3500284011 MANTRACOURT ELECTRONICS LIMITED www court co uk Manufactured In the UK CE Mount this package adjacent to the strain gauge Mount this package directly into the strain gauge pocket Plug in and go sensor High accuracy A quantum leap in the quality of measurement Integrate the electronics with the loadcell remove the cost space and bother of additional electronics and have a direct output provided in REAL ENGINEERING UNITS Accuracy 1 part in half a million
8. ct your distributor for a copy In the unlikely event you have problems with the ICA module we would advise that you take the following precautions The unit is installed as instructed Recommended spares are kept in stock We can assist Sufficient expertise available for first line maintenance Routine maintenance checks are performed annually is recommended The necessary documentation for the product is available to the maintenance personnel We recommend you keep on file as a minimum This Manual The calibration figures for the attached sensors A record of the normal output if applicable A calibration record of the ICA A contact phone number from the supplier for assistance Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual 10 Chapter 7 Glossary Background Noise The total noise floor from all sources of interference in a measurement system independent of the presence of a data signal See Noise Bipolar The ability of a signal conditioner to display both positive and negative ee i Calibration Adjustment of an instrument or compiling a deviation chart so that it s reading DAO ane correlated tothe actual valebeltgmesuted E CMR The ability of an instrument to eliminate the effect of AC or DC noise between Common Mode signal and ground Normally expressed in dB at DC to 60 Hz One type of CMR is Rejection specified between SIG LO and PWR GND In differential meters a second type
9. e 10V Note 1 Set by calibration resistor 13 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Table 8 2 ICA2S and ICA2H 0 1 to 5 1V Environmental Typical Supply voltage Range 85 12 28 Vots Operating Current AEE o 8 gt a Range ae e dice Ly Range a o oa fe vue iS Protection Note 1 Not including excitation current e g when connected to a 350 Ohm load cell excitation current 5 350 14mA Total current 22mA Measurement Typical 5 5410 Volts J S 1000 5000 Ohms o 2 5 Oms _ Zero adjustment J 2 gt Span adjustment J 8 gt C A A C ees Linearity 0 02 Temperature stability aaa Fer rompetature L 0 0009 0 0025 FR Deg C At 2 5mV V Stability S Version Span Temperature 7 Stability S Version i 0 0025 0 0064 FR Deg C At 2 5mV V Zero Temperature Span Temperature A Stability H Version Lo 0 002 0 0051 FR Deg C At 2 5mV V FR Full Range 5V Note 1 Set by calibration resistor CE Approvals European EMC Directive 2004 108 EC BS EN 61326 1 2006 BS EN 61326 2 3 2006 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual 14 Other Mantracourt Products www mantracourt co uk Signal Conditioning SGA STRAIN GAUGE AMPLIFIER e Connect up to 4 strain gauges Proportional mA and or Voltage output Simple DIL switch configur
10. er installation and improved joint reliability e Multi layer printed circuit boards and additional filtering has been added to further improve the EMC performance e Faster and easier mounting installation The mounting hole size and position has been standardised on all models and also provides the capacitive coupling connection to the sensor body which further improves the EMC performance The hole will accommodate a 2mm 0 80 screw with adequate clearance for the head As this mounting method is compatible with our range of D Cell products a single pocket design will accept either digital or analogue conditioners e An ATEX Intrinsic Safety certified version of the ICA5 has been introduced e All variants are RoHS compliant e All models have a reduced height of just 7 6mm The diameter remains at 19 5mm e Anew model the ICA6 has been introduced which will provide a 10 Volt output from a uni polar 15 to 28V Supply e Non interaction between the trimmers makes calibration easier and faster Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual 2 Chapter 1 The ICAS and H Range Figure 1 1 Block Diagram POWER p SUPPLY wur CZ AMPLIFIER JES orur Load Cells 0 1 to 10 1V Strain Gauges 0 1 to 5 1V Torque Transducers 10V 15V suppply Pressure Transducers 4 20mA 40 20mA 2 wire 10V 15 24V supply The ICA is a Strain Gauge Amplifier converting a strain gauge input to a Volt or mA output
11. h calibration conditions ideally between 75 and full scale and adjust the S potentiometer to give an output of 10 1V for the ICA1 and 5 1V for the ICA2 3 Apply the known low calibration conditions and re adjust the Zero if required Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Chapter 5 Trouble Shooting 1 No Output a Check power supply is present and the correct polarity b Check the output connections are correct with no open circuit connections c Check terminations ensure there are no dry joints d Check the sensor is connected typically reading 350 Ohm across output amp with the power off e Check the Excitation voltage is correct f Check the load is connected and is not open or short circuited g Check Span and Gain calibration 2 Low Output This is when an output is present but not of sufficient magnitude to meet the required value Remember to allow for Tare Weight and ensure it is measured and allowed for in the output from the ICA a Check power supply is within specified limits i e is not low b Check the sensor is connected typically reading 350 Ohm across output amp with the power off c Check the Excitation voltage is at 5V dc d Check the calibration e Check the Zero offset is correct for the sensor this too is a common reason for low outputs 3 High Output This is when an output is present but higher in span or zero than expected High output
12. hielded twisted multipair cable 7 0 25mm 2 pair Tinned copper drain Individually shielded in polyester tape Diameter 4 1mm Capacitance m core to core 115 pF amp core to shield 203 pF UK Farnell 585 646 Individually shielded twisted multipair cable 7 0 25mm 3 pair Tinned copper drain Individually shielded in polyester tape Diameter 8 1mm Capacitance m core to core 98 pF amp core to shield 180 pF UK RS 626 4761 Braided shielded twisted multipair cable 7 0 2mm 1 pair wi Miniature twin round Diameter 5 2 mm Capacitance m core to core 230 pF amp core to shield 215 pF If possible segregate the signal cable from Power Cables allow a 1metre 3 feet distance from such cables Do not run signal cables in parallel with power cables and cross such cables at right angles The ground connection conductor should have sufficient cross sectional area to ensure a low impedance path to attenuate RF interference Output Connections The ICA1 S and H versions provide a 0 1 to 10 1V dc output while the ICA2 S and H versions provide a 0 1 to 5 1V dc output While they utilize the same PCB they have different components on board Connect the output as shown in Figure 2 2 or alternatively Figure 2 3 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Chapter 3 Calculating the gain resistor value The ICA1 and 2 are supplied un calibrated but optimized for a sensitivity of 2 5mV V To accommodate other
13. ies 2 5 0 1 2 4 e g for 5 0V offset bipolar ICA1 Roffs 148k 148k 30 2k Ohms Use preferred value 30k 5 0 0 1 4 9 The gain of the ICA will need to be reduced to account for the lower output swing required for a given input change For the ICA1 re calculate Rgain by scaling the load cell s mV V by the ratio 10V bipolar output change and 5V bipolar output change for the ICA2 and use the above formulae For example an ICA2 is required to operate at 2 5V 2 4V for a 2 5mV V input Fit Roffs 61 7k as above and re calculate Rgain from Table 3 2 using 5V 2 4V x 2 5mV V 5 208mV V i e Gain 35 71 therefore Rgain 1152 Ohms the nearest preferred value is 1k15 E96 series 7 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Chapter 4 Calibration The ICA1 and ICA2 S and H versions can be calibrated with the transducer connected provided that two calibration points can be implemented e g by applying known weights or forces If this is not possible a stable mV source or load cell simulator can be used if the precise sensitivity mV V of the transducer is known Figure 4 1 Connection Details for Calibration Voltmeter Display Output PSU veQ Com Strain Gauge XK 7 Load Cell Chassis 1 Apply the known low calibration conditions weight force or mV V This may be zero if required and set the output to 0 1V using the Z potentiometer 2 Apply the known hig
14. nd other environmental parameters are within specification and where necessary taken into account when calibrating should such parameters have an effect on the calibration 6 Fine Span Gain and Zero Offset Adjustment Problems If the adjustment cannot reach the maximum output desired then check the tare is not too high If the potentiometer does not alter the output the unit must be repaired remove from service It is always wise to check a known good ICA against the problem installation before rejecting the suspect ICA 9 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Chapter 6 Product Care A worn out component excessive use in harsh environments an overly zealous operator regrettably some circumstances necessitate repair At Mantracourt Electronics Ltd we can t guarantee that a product will never require repairing We can however promise a repair service of exceptional quality one which is governed by a rigorous procedure Detailed below is our pledge to you a defined set of ground rules and procedures to which we will adhere All we ask in return is that you assist us with our procedure such that we can maintain our promise to you Please note that warranty repairs may not be available on overdue accounts and that a strict interpretation of our conditions of trading invalidates warranty claims where late payment has occurred Please refer to Customer Repair Service Procedure document conta
15. of CMR is specified between SIG LO and ANA GND METER GND Common Mode The ability of an instrument to reject interference from a common voltage at Rejection Ratio its input terminals with relation to ground Usually expressed in db decibels including change in ambient temperature time and line voltage Excitation The external application of electrical voltage current applied to a transducer for normal operation Fine Adjustment Zero and Span calibration have a Fine Adjustment to give accuracy to the calibration These are potentiometers P1 and P2 for Span and Zero respectively Full Bridge A Wheatstone Bridge configuration utilizing four active elements or Strain Gauges Full Range Output The algebraic difference between the minimum output and maximum output Gain Gain is otherwise identified as SPAN It relates to the proportional output to the sensor input Calibration of the ICA is determined by setting the Gain Span and Offset Zero The amount of amplification used in an electrical circuit ground Linearity The closeness of a calibration curve to a specified straight line Linearity is expressed as the maximum deviation of any calibration point on a specified Straight line during any one calibration cycle The electrical demand of a process expressed as power watts current amps or resistance ohms associated external circuitry The load cell is one of a series of STRAIN GAUGE sensors that the ICA inpu
16. resistance s an emf source and a galvanometer connected such that when the four resistance s are matched the galvanometer will show a zero deflection or null reading Zero Zero is otherwise identified as OFFSET It relates to the proportional output to the sensor input Calibration of the ICA is determined by setting the Span Gain and Zero Offset the display corresponds to a non zero signal instrument See Zero Suppression Zero Suppression The Span is Offset from Zero Zero Suppressed such that neither limit of the Span will be Zero For example an instrument which measures a load of a 100kg Span from 400kg to 500kg is said to have 400kg Zero Suppression Alternating Current Hertz Frequency kilohertz Frequency milliamps millimetres Signal Conditioner Strain Gauge Amplifier Volts millivolt N Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual 12 Chapter 8 Specifications for the ICA1 and ICA2 S and H Table 8 1 ICA1S and ICA1H 0 1 to 10 1V Electrical and Environmental Typical Supply voltage Range 1 0 Volts fo 3 Range Range Reverse polarity 30 Protection Note 1 Not including excitation current e g when connected to a 350 Ohm load cell excitation current 5 350 14mA Total current 22mA Operating Current Se ow Measurement Span adjustment SS TT i canny tema l seat Yes sanity i Verso sani Verso FR Full Rang
17. s shipment box Check that the unit is complete and undamaged The ICA units can be operated in any industrial environment providing the following limits are not exceeded Operating Temperature 40 C to 85 C Humidity 95 non condensing Storage temperature 40 C to 85 C The following installation practices are advised Minimise vibration Do not mount next to strong electrical fields transformers power cables Ensure easy access to the module Install electrical protection device as the unit is not internally fused Always ensure the package is secure and protected Figure 2 1 Dimensions The module is designed to fit in the strain gauge pocket Use the 2 1mm hole to secure the unit if required The mounting hole will accept an M2 screw or American equivalent 0 80 Important Note DO NOT USE 2 screw size Take care soldering cables to the pads Use a temperature controlled soldering iron set to a maximum 330 C for no longer than 2 seconds per pad Excessive heat or increased soldering time may result in damage to the PCB If changing resistor R do so at a workbench and not on site Check the relevant details for model ICA1 and 2 ensure the module matches the instructions The ICA1 and 2 solder pads are as shown in the wiring diagrams 4 pads for the strain gauge 3 pads for power supply and output The fixing screw hole provides a ground connection to improve EMC performance Power Connections The power s
18. t is designed to accept Torque Sensor Pressure amp temperature transducers Millivolt One thousandth of a volt 10 volts symbol mV Noise An unwanted electrical interference on the signal wires output Offset is otherwise identified as ZERO Calibration of the ICA is determined by setting the Offset Zero and Gain Span Potentiometer Two potentiometers variable resistors are used in the ICA1 amp 2 for fine calibration Pressure The Pressure Transducer is one of a series of Strain Gauge sensors that the ICA Transducer input is designed to accept Torque Sensor Load Cell and Temperature Transducers Proportional The Voltage or Current outputs are calibrated to be directly proportional to the Outputs input from the sensor The output is within the sensor limits taken as linear and no linearity compensation is required within the ICA 11 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Resolution The input corresponding to a one unit change in the least significant digit of the data acquisition display equipment Good resolution is not necessarily equal to good accuracy Sensing Element That part of the Transducer which reacts directly in response to the input Sensitivity This is the relationship between the change in Strain Gauge input to the level or magnitude of the output Signal Conditioner A circuit module that offsets attenuates amplifies linearizes and or filters
19. the signal The ICA is essentially a Signal Conditioner more specifically known as a Strain Gauge Amplifier in that it CONDITIONS alters the input signal from a load cell to an electrical output Single Card The ICA has only the one Printed Circuit Board assembly on which all the Assembly components are mounted The assembly is then mounted inside an environmentally rugged enclosure Span Span is otherwise identified as GAIN It relates to the proportional output to the sensor input Calibration of the ICA is determined by setting the Span Gain and Zero Offset The ability to adjust the gain of a process or strain meter so that a specified display span in engineering units corresponds to a specified signal span Stability The quality of an instrument or sensor to maintain a consistent output when a constant input is applied Strain Gauge The Strain Gauge is a resistance bridge device where the bridge value alters linearly and proportionally to the force exerted on it be it pressure torque or load The ICA is designed to convert this change in the of the Strain Gauge to a proportional electrical signal Strain Gauge The ICA is essentially a type of Signal Conditioner that it conditions alters the Amplifier input signal from a strain gauge to an electrical output Torque Transducer The Torque Transducer is one of a series of Strain Gauge sensors that the ICA input is designed to accept Wheatstone Bridge A network of four
20. ty have been introduced into the Mantracourt range of In Cell Amplifiers They offer improved performance and easier installation over the original designs The following points detail the main changes e The ICA1 and ICA2 output ranges have been changed to cover 0 1V to 10 1V and 0 1V to 5 1V respectively to facilitate calibration and interpretation of the output level The linearity has been improved at the lower end of the scale down to 7OmV output e Excitation is standardised at 5V DC on the ICA1 2 3 4 and 6 e The performance of the ICA family has been much improved over the operating temperature range by using high performance auto zero amplifiers and low drift resistors The standard S versions give a 200 improvement compared to the earlier versions The high performance H versions are fitted with higher specification resistors to offer a 400 improvement over the earlier versions e The user selectable span resistor is mounted via two standard plated through holes in the printed circuit board making it easier to change if required There is also provision for a second resistor not normally fitted to give an offset zero if required for example 5 1V 5V for an ICA1 Refer to chapter 3 for calculating the values or Rgain and Roffs e All wire connections are via plated through holes instead of the single sided pads used in the original design This allows all wires to enter from either side of the board resulting easi
21. upply for the ICA1 is nominally 24V dc between 13 and 28V and ICA2 is nominally 12V dc between 8 5 and 28V The power supply is commoned with the output at the com connection Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Figure 2 2 Connection Details for the ICA1 and ICA2 TR AA Strain Gauge Load Cell Chassis The strain gauge cable should be attached to the solder pads as illustrated For most applications 3 wire un shielded field wiring is quite adequate For best EMC performance use the connections shown in Figure 2 3 Figure 2 3 Connection Details for Best EMC Immunity Terminating Screen N B The PSU Com or Load common connection can be taken to ground The ICA should be mounted by means of the bolt hole This capacitively couples the common of the ICA1 amp 2 electronics to the strain elements in the load cell which improves the EMC susceptibility performance Take note of the grounding arrangement particularly the bolt hole which capacitively couples the common of the ICA electronics to the strain elements in the load cell which improves the EMC performance 5 Mantracourt Electronics Limited ICA1 and ICA2 S and H Versions User Manual Table 2 1 This typical cable data is provided for information only The cable should have 2 x twin twisted cables Ideally each pair should be individually shielded and with an overall shield Supplier Farnell 118 2117 Individually s
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