VCON USER MANUAL
Contents
1. PART NUMBER STRAIN AC INPU anv OUTPUT 4 20mA SUPPLY 2307 AC OPTIONS 10V EXCITATION NATO STOCK No SERIAL No STR2 199 Fig 1 Serial Number Label PLCPLC E N L PLCPLC Output Power Output Power Oo Oo IIR STRAIN AC Signal Converter IIR STRAIN DC Signal Converter CAL POWER CAL POWER SPAN ZERO O O SPAN ZERO O 0 O 0 Signal Excit Signal Excit CALCAL CAL CAL Fig 2 STR_AIN Front Panel Labels II G 9603 02 Page 5 STRAIN USER MANUAL 3 0 3 1 3 2 3 2 2 3 3 3 4 3 5 CONNECTIONS This section details the instrument connection information Before proceeding please check the information on the serial number label on one side of the unit to ensure that the unit configuration is correct Connection details are given on the front panel label as shown in fig 2 above Power Supply The supply voltage is indicated on the serial number label APPLICATION OF VOLTAGES HIGHER THAN THAT STATED FOR THE SUPPLY MAY CAUSE DAMAGE TO THE INSTRUMENT Ensure that no bare wire protrudes from the rear of the power connector risking a short circuit We advise the use of bootlace ferrules on all bare wires STRAIN AC The live conductor suitably fused as discussed earlier must be connected to L the neutral to N and protective earth to E STRAIN DC The supply polarity is clearly marked however reverse polarity conn2. 3mV can be accommodated Signal ranges outside those detailed above may be possible with modified accuracy specifications consult factory for details 1 2 Output Types and Ranges IIG 9603 02 Page 3 STRAIN USER MANUAL Both members of the STRAIN family share the same output stage which can provide two types of output OUTPUT FULL SCALE RANGE Over range limit approximately ImA i Current Source 20mA 30 into 12 K ohm into 600 ohm MAX MAX 1i Buffered voltage source 100mV 12V 30 into 200 ohm into 2K4ohm MIN MIN This includes all standard output ranges such as 0 10mA 4 20mA 0 20mA 1 5V and 0 10V The output range should be specified at the point of order Alternatively either the default or the user reconfigurable output option can be chosen The default output range is 4 20mA whilst the user reconfigureable option allows 0 10V 4 20mA or 0 20mA output to be user selected with internal switches units conforming to this option will be shipped as 0 10V output unless otherwise requested 1 3 Power Supply STRAIN AC The STRAIN AC is user reconfigurable by internal voltage selector switch for 115 or 230 V AC 50 60 Hz The voltage tolerance is 10 on either voltage for specified performance If mains voltage is not specified then the unit will be set at 230V Current consumption at 115V is about 50mA RMS Fusing The STRAIN AC incorporates a non resettable thermal cutout on the mains input wh
3. frequency a two yearly recalibration interval is adequate for most applications In the case of reconfigurable units recalibration must be carried out after any change of configuration With appropriate input values use front panel zero and span pots to obtain desired zero scale and full scale voltage or current output preferably into the actual circuit load resistance for greatest accuracy It may be necessary to repeat each adjustment to ensure correct calibration Additionally it is recommended that the input should be taken slightly under and over the required range after calibration to check that the unit is in its linear region If in doubt contact the factory technical support staff will be pleased to help IIG 9603 02 Page 7 STRAIN USER MANUAL 6 0 INSTALLATION Fig 3 Installation Data For STRAIN 45mm Installation Data o0O000000 A Mounting DIN Rail T35 Orientation Any Vertical Preferred Connections Screw Clamp With Pressure Plate 75mm Conductor Size 0 5mm 4 0 mm Insulation Stripping 10mm Screw Terminal Torque 0 4Nm Max Weight 340g approx STRAIN AC Depth Of Unit 110mm oOo0oo00000 y 6 1 Installation onto Rails The instrument is designed to mount directly onto the Top hat TS35 standard assembly rail to DIN 46277 part 3 EN 50022 BS5584 6 2 Mounting Arrangements Ideally the unit should be mounted in a vertical position i e on a horizontal rail This is the optimum orientation to
4. D Immunity Performance is not degraded by 8 KV ESD to ground in the vicinity of the units Direct ESD greater than 4 KV to the connection terminals or adjustment pots of the unit should be avoided IMPORTANT Service Maintenance personnel should take care to discharge themselves to the control cabinet systems earth before wiring adjusting or calibrating the unit ii RF Immunity The outputs of the units vary by less than 1 full scale with fields of 10Vm with 80 AM at 1KHz between 800KHz and 1GHz with any field orientation iii Fast Transient Immunity During transients of 2 KV the outputs are temporarily affected and may vary y 8 by up to 5 full scale During transients of 500V the outputs vary by less than 1 full scale Hence the units are suitable for both Light industrial and Industrial environments Page 10 IIG 9603 02
5. ONFIGURING THE INSTRUMENT applies to reconfigurable units only In many cases the instrument is factory configured in which case this section can be ignored However if the output of the unit is reconfigurable this will be stated on the serial number label In order to reconfigure the output of the instrument it is necessary to remove the circuit assembly from the plastic enclosure This is achieved by gently levering apart both the grey sides at the front of the unit such that the black connector pips are released and sliding the black connector blocks forward about 5cm 2inches Output Configuration The output of a reconfigurable unit may be configured to give any of the following DC ranges 0 20mA 4 20mA 0 10V 2 10V Behind the power connectors are two slide switches which should be moved towards the front or back of the unit as follows Output Required Outer Switch Position Inner Switch Position 4 20mA Front Front 0 20mA Front Back 0 10V Back Back 2 10V Back Front Mains voltage selection applies to STRAIN AC only The mains voltage of the STRAIN AC can be set to a nominal 115V or 230V input Behind the black connector block housing the power connections is a large slide switch slide the black lever fully towards the front of the unit to reveal 115 legend for 115 V or towards the back revealing 230 for 230V RECALIBRATION All units are factory calibrated although the user may wish to recalibrate with greater
6. STRAIN USER MANUAL STRAIN FAMILY OF ISOLATING SIGNAL CONDITIONERS STRAIN AC STRAIN DC Whilst every effort has been taken to ensure the accuracy of this document we accept no responsibility for damage injury loss or expense resulting fromerrors or omissions and reserve the right of amendrent without notice IMO Precision Controls Ltd This document is issued by IMO Precision Controls Ltd and may not be reproduced in any way without the prior written permission of the company 11G 9603 02 Page 1 STRAIN USER MANUAL CONTENTS 1 0 INTRODUCTION 3 2 0 UNPACKING i 3 0 CONNECTIONS 7 4 0 RECONFIGURATION applies 9 to reconfigurable option units only 5 0 RECALIBRATION 10 6 0 INSTALLATION 11 7 0 SPECIFICATIONS 13 Page 2 IIG 9603 02 STRAIN USER MANUAL 10 INTRODUCTION The STRAIN range is a family of signal conditioners capable of accepting strain gauge load cell pressure gauge or mV input types into an isolated input stage and providing a separate isolated re transmitted output Each unit is a full 3 port isolating device the input output and power supply input being isolated from each other An isolated excitation power supply is provided for gauge bridge applications This can be used to provide DC voltage bridge excitation between 1 25 and 12V with maximum supply current of 40mA The instrument is available in two different formats each accepting a different type of power source The STRAIN AC is mains powere
7. ce on load resistance R Response Time 90 of step change EXCITATION SUPPLY Initial voltage accuracy Thermal drift Power Supply and Isolation voltage STRAIN DC Operating Voltage Current consumption Input to output to power supply isolation 3 port STRAIN AC Operating Voltage Current Consumption Input to Output Signal Isolation Power supply to input output signal isolation Operating Ambient Operating temperature range Storage temperature range Operating amp storage humidity range Faster response time is possible contact factory for details Upscale output 25mA 12V gt Upscale output 25mA 12V 0 05 full scale 0 1 full scale 50ppm full scale C 100ppm C 10ppm Q 0 lt RL lt 600Q 150ms typical 5 of stated voltage 100 ppm C 24V DC 10 150mA typical 1kV DC 115V or 230V AC 50 60 H 10 50mA 25mA typical 1KV DC 4KV AC 0 55 C 40 100 C 0 90 ru IIG 9603 02 Page 9 STRAIN USER MANUAL EMC performance EMC performance Both the STRAIN AC and STRAIN DC conform with the protection requirements of Council Directive 89 336 EEC on the approximation of the laws of members states relating to electromagnetic compatibility Article 10 1 1 Radiated Emissions The units meet EN55011 1991 Group 1 Class B and EN55022 1987 Class B 2 EMC Immunity The units meet EN50082 2 1995 as follows 1 ES
8. d whilst the STRAIN DC is powered by a low voltage source This manual covers both formats Input signal output signal and power supply information are required to define any unit exactly This information together with a unique serial number is printed on the side label of each unit records of the exact configuration of every product shipped are maintained at the factory 1 1 Input Types and Ranges Both members of the STRAIN family share the same input stage Inputs can be specified either in mV or in gauge bridge sensitivity in mV V with the required bridge excitation voltage being stated In general inputs are expected to be unipolar however negative inputs down to SmV can be accomodated to allow for bridge resistance offsets etc A positive offset can be specified to allow a gauge to be used with a pre load e g 10 to 30mV input range The limits on signals that can be handled with the accuracy specified in section 7 are MIN offset MAX offset MIN span MAX span 5mV 100mV 10mV 100mV The limits on excitation voltage are VOLTAGE MAXIMUM CURRENT MIN BRIDGE RESISTANCE 1 25V 30mA 42 2 5V 30mA 84 5 0V 40mA 125 7 5V 40mA 188 10 0V 50mA 200 12 0V 50mA 240 Any combination of these parameters can be specified at the point of order Alternatively the default configuration can be requested The default configuration provides 10V excitation as standard with adjustable gain to cover the range from 1mV V to 4mV V A zero offset of
9. ections will not damage the unit Bridge Connections Signal Inputs The bridge output or mV signal should be connected to the SIG and terminals appropriately Reverse polarity signals will not damage the unit Excitation output The excitation and terminals should be connected to the bridge excitation terminals appropriately Reverse connection will result in negative bridge output but will not damage the unit Output Connections Regardless of output type the common return or negative of the output circuit should be connected to the out terminal Similarly the positive connection should be made to the output terminal Test Terminals On the front of the unit are two brass terminals marked and They can be used to check the mA output of the unit without breaking the output loop A voltage of 10mV per mA is present i e 4 20 mA will read 40 200mV Accuracy is 1 so the terminals should be used for indication only rather than for calibration purposes CAL Button CAL amp PLC Terminals The CAL button simply places a momentary short circuit across the CAL terminals when it is pressed The CAL terminals are not internally connected to any other circuitry The user may make use of this switch in his own calibration circuit if desired The PLC terminals are not normally connected and may be ignored Page 6 IIG 9603 02 4 0 4 1 4 2 5 0 STRAIN USER MANUAL REC
10. ich will operate in the case of overheating The low voltage circuitry is protected by resetting fuses IMPORTANT The STRAIN AC should additionally be protected by a 100mA anti surge fuse T 100mA with a voltage rating of 250V AC and a breaking capacity of 35 A at 250 V AC placed in series with the live power input STRAIN DC The STRAIN DC is factory set for the standard requirement of 24 V DC The voltage tolerance is 10 for specified performance Maximum current consumption at 24 V is 100mA for current output units or 150mA for voltage ouput or user reconfigurable output units 5V DC 12V DC and 24V AC supplies can be catered for by specific request contact factory for details Fusing The STRAIN DC incorporates an internal 200mA self resetting fuse No external fusing is necessary Page 4 IIG 9603 02 STRAIN USER MANUAL 2 0 UNPACKING Please inspect the instrurant carefully for signs of shipping damage The unit is packaged b give maximum protection but we can not guanteethat undue mishandling will not havedamaged the instrument In the case of this unlikely event please contact your suppler immediately and retain the packaging for our subsequentnspecton 2 1 Checki ng the Unit T ype Each unit has a unique serial number label fi g 1 below on which full details of the configuraton are given These details should be checked b ensure conformance with your requirement IMO C lt
11. minimise temperature rise within the unit However successful operation is possible in any orientation Ensure the maximum ambient temperature is less than 55 C Good airflow around the unit will maximise reliability 6 3 Wiring Precautions The unit accepts sensor inputs some of which produce very small signals Therefore it is advisable to adhere to the following rules of good installation practice 1 Do not install close to switchgear electromagnetic starters contactors power units or motors ii Do not have power or control wiring in the same loom as sensor wires iii Use screened cable for sensor wiring with the screen earthed at one end only iv Take care not to allow cut pieces of wire to fall onto the unit as they might enter via the ventilation holes and cause electrical short circuits if in doubt remove the units from the rail until wiring is complete v Use bootlace ferrules on all bare wires IMPORTANT The connection terminals are designed for a maximum torque of 0 4Nm Exceeding this figure is unnecessary and will result in unwarrantable damage to the unit Page 8 IIG 9603 02 STRAIN USER MANUAL mmm n oii 7 0 SPECIFICATIONS All specifications are at 20 C operating ambient with 250Q output load current output unless otherwise stated Accuracy and Response SIGNAL PATH excluding excitation supply Calibration accuracy at zero and full scale Linearity Zero drift Gain drift Gain dependen
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