PDF Manual - Load and Force Cells, Indicators and Signal
Contents
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3. DC 6 kz Filter cut off Switchable ranges 1 5000 Hz Zero temperature coefficient 25mviv 0 002 0 009 weC 2 5mVIV FR Span temperature coefficient 0 007 oo WC Linearity 008 eR Gain stability tst 1000 Hours 02 WR Gain stabilty 2n 1000 Hours Ot mr 90 day Offset stabiity 33 nw O Output load stability gain 0 100 oo WR 00 WR 00 WR oot WR Operating temperature range EE C Humidity 95 9 N B 18V max at full load Output options 10V 5V 0 10V 0 5V 0 20mA 4 20mA Connections Field screw terminals 2 5mm rising clamp Enclosure ABS case 160 x 80 x 55 sealed to IP65 fitted with 3 off cable glands Controls Gain pot Offset pot Coarse gain switches Coarse offset switches Filter cut off switches Output mode switch Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 21 Environmental Approvals EMC Emissions EN 50 081 1 1992 Light industrial EMC Emissions EN 50 081 2 1992 Heavy industrial EMC Immunity EN 50 082 1 1992 Light industrial RF Field Test 100 ppm of reading over 30 to SOOMHz EN 50 082 2 1992 Heavy industrial RF Field Test 500 ppm of reading over 30 to SOOMHz Low Directive IEC 1010 EN 61010 WARRANTY All SGA products from Mantracourt Electronics Ltd Mantracourt are warranted against defecti
4. For an 8 volt output from a fully loaded 2 5mV V load cell use the 3 19mV V setting i e 10 8x2 5 3 125mV V Table 3 6 31 1 20mV V SW1 0010 000 12 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 The SGA A amp SGA D 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 provided that the precise sensitivity mV V and full range output kg of the transducer is known In this case the Ref 5V output should be connected to strain input and the mV source applied between strain input and strain input Actual calibration is carried out in the following way 1 Set the correct switch settings on SW1 as described above using the transducer s calibration sheet supplied by the manufacturer This is normally specified as sensitivity or full range output and should be in mV V Apply the known low calibration conditions weight force or mV V this may be zero if required and note the analogue output having ensured that the SW1 settings are correct for the transducer sensitivity as step 1 above Apply the known high calibration conditions for optimum accuracy this should be at least 75 of full load and note the analogue output Use the fine trim control P1 to obtain the required change in Volts or mA between th
5. Gain and Zero Offset Zero Adjustment The ability to adjust the display of a process or strain meter so that zero on the display corresponds to a non zero signal such as 4 mA 10 mA or 1 V de Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 19 given by a measuring instrument See Zero Suppression Zero Suppression The span of the SGA can be offset from zero zero suppressed such that neither limit of the span will be zero For example an SGA which measures a load of a 100kg span from 400kg to 500kg is said to have 400kG zero suppression Alternating Current Direct Current IP66 UK Environmental Specification mm Strain Gauge Amplifier millivolts 20 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Chapter 8 Specifications for SGA A amp SGA D Load Cell Amplifiers Parameter Nn Typical Power supply SGA A 110 230Vac 50 60Hz 110 280 Power supply dc 18 Ne nee of Power supply current de depends on loading 50 90 Bridge resistance s j Oms Bridge sensitivity Switchable 008 29 mw Gaimadjustment Pot fineadj 006 10 mw Offset adjustment Pot finead o es WR o Offset adjustment Switchable coarse ad 3128 s79 ER Output load Volageoutpu 2 m __ Output load Current output o 5o omms Bandwidth No fiterand gt 2mV V _
6. J2 Excitatio POSTS t y t y O ie S Strain Excite Excitation Vi SN r3 ER Screen 0V Io 1d mos I O Ref 5V Output Output gq r 4 Strain Input SN L DT ARANA NT St Strain Gauge Output s Do not terminate screen at transducer end Excitation Strain excite is Excitation to the transducer Strain input is Signal from the transducer The Ref 5V is generated internally and used for calibration The cable connecting the sensor to the SGA should be screened This typical cable data is provided for information only The cable should have 2 x twin twisted cables Ideally with each pair individually screened and with an overall screen Table 2 1 PartNo Description Supplier UK Farnell 148 539 Individually screened twisted multipair cable 7 0 25mm 2 pair Tinned copper drain Individually screened in polyester tape Diameter 4 19 mm Impedance 54 Ohms Capacitance m core to core 115 pF amp core to screen 203 pF UK Farnell 585 646 Individually screened twisted multipair cable 7 0 25mm 3 pair Tinned copper drain Individually screened in polyester tape Diameter 6 86 mm Impedance 62 Ohms Capacitance m core to core 98 pF amp core to screen 180 pF UK RS 367 533 Braided screened twisted multipair cable 7 0 2mm 1 pair Miniature twin round Diameter 4 8 mm Impedan
7. Offset Offset is otherwise identified as Zero It relates to the proportional output to the sensor input Calibration of the SGA is determined by setting the Offset Zero and Gain Span Two potentiometers variable resistors are used in the SGA for fine calibration Pressure Transducer The Pressure Transducer is one of a series of Strain Gauge sensors that the SGA input is designed to accept Torque Sensor Load Cell and Temperature transducers Proportional Outputs The Voltage or Current outputs are calibrated to be directly proportional to the input from the sensor The output is within the sensor limits taken as linear and no linearity compensation is required within the SGA 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 Sensitivity The minimum change in input signal to which an instrument can respond This is the relationship between the change in strain gauge output to the level or magnitude of the SGA output Signal Conditioner A circuit module that offsets attenuates amplifies linearizes and or filters the signal for input to an A D converter A typical output signal conditioning is 4 to 20 mA The SGA 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 S
8. 19114 ON 48H t i 9 indio enBojpuy pas das xxx x 1 v vos E e Bree fe gt Abz 8l q vos 10 v voS fiSd Dd Aluo v vos indui suu 2v S 1eJ9p UOWIBUUOD q v9S 3 V VOS In the interests of continued product development Mantracourt Electronics Limited reserves the right to alter product specifications without prior notice CE 04 04 02 Doc Ref ME 0104ML 1D Issue 2 2 Code No 517 150 23 ted SGA A amp SGA D User Manual Issue 2 2 IMI Mantracourt Electronics L Other Mantracourt Products www mantracourt co uk Signal Conditioning SGA ICA STRAIN GAUGE AMPLIFIER IN CELL STRAIN GAUGE AMPLIFIER Connect up to 4 strain gauges Proportional mA and or Voltage output Proportional mA or Voltage output Simple DIL switch configuration Single strain gauge applications Set Sensitivity and Low pass filter and output small in size Big on Specification Simple Reliable Rugged LCA ADW15 IN LINE INTELLIGENT 72 mm DIN Module Display amp Controller STRAIN GAUGE AMPLIFIER 10 mm LED Display Configurable 2 Set Points Sensitivity from 0 5 mV to 200 mV V 4 to 20 mA AND 0 to 10 V isolated outputs 10 V 150 mA Excitation RS 232 485 Communications port Isolated 1 0100mSec sample rate On Board easy to use Programmer Set Point Relays Auto tare Auto calibrate and much more 4 to 20 mA Output Programmable via keypad FIELDBUS CONNECTIVITY IN TWO EXCE
9. A 0 Eme Eme Eme Eme Eme Eme Eme Em E Te lle TE lo Y gt lo Y o Y Y jo Y n FE In TK o lo Y au Y gt o E mE I ME I me co gt 2 m BIN mM gt ME co gt N co Ie mE 8 me IN m lo co ie ME leo co gt NE Nee IN we IPB G SI we nte are o 2 x DIE x ie x gt VIS Ee 8 RIIA PIS x S VIS PIB x PIS Pee gt o CO x cO x GO x co x co x GO x GO x ok a oe ocios llo Es Eolo loe l O boc o SNe m 10 10 PIEW PIEW PEWS Ene lEn PEL gt En PEW Ene En Ene Ene Eme o tE y Y e tE uo les JIN SE le lo lo TE llo Y PIA SE lla E 5 Sm f co mc I ME Enc EME Sm VIS mm En BIE ME me t8 co leo co e ME co gt 2 Q E e NE IFN f e Na exe S ac IF ex 9 1 e 9 vie Nae ae llo llo E IP re E l e Ja DIR e S B x DIR e Y e ee B x II e 10 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Span Gain Setting Switch 1 Example A strain gauge has a sensitivity of 2 809 mV V Select table 28 and fine tune with potentiometer Pl Table 3 7 SWi 1 2 3 4 5 6 7 8 IR Dnm Refer to the Calibration Chapter 4 amp Table 3 5 Zero Offset Setting Switch 2 This offset can be used to compensate for the transducer zero error to tare the scale dead load or to shift the output These settings allow the user to calibrate a zero offset The range
10. allows for up to 7996 of the span Use the fine adjustment is provided by potentiometer P2 Table 3 8 sw2 1 2 3 4 5 6 7 J 8 ve ve 40 20 10 5 2 1 Offset Offset Example An installation has a tare of 15 kg with the 200kg strain gauge giving an output of 6 37mV V at 10V excitation The SGA excitation voltage is 10 V DC This equates to 15 200 7 5 set switches to nearest and adjust with Potentiometer P2 The tare must be subtracted therefore the offset switch SW2 2 should be ON The calibrated zero mV reading would be 4 78 mV i e 7 5 of 63 7mV Table 3 9 NOTE SW2 1 amp 2 should never be set ON together Either one or other should be set ON if an offset is required otherwise both switches should be set OFF Switch settings 3 to 8 are ADDITIVE The offset value of each switch is added to give a total offset of 79 Fine adjustment is provided by potentiometer P2 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 11 Chapter 4 Calibration The SGA A amp SGA D provides the excitation supply and signal conditioning to cater for a wide range of strain gauges load cells pressure transducers or torque transducers Output Select the analogue output range as detailed in Chapter 3 Figure 3 1 Table 3 1 amp 3 2 by means of SW4 Zero Offset Select the offset as detailed in Chapter 3 Table 3 8 by means of SW2 Having selected the polarity and
11. connection to the output load is electrically common to the load cell Select this option by fitting the two jumpers in the positions next to the capacitor See Figure 3 2 In Source mode the ve end of the load is connected to the SGA output and the current is sourced by the SGA output through the load towards ground OV This mode has the advantage that the negative output connection is common to the load cell Excitation terminal Select this option by fitting the two jumpers in the positions furthest from the capacitor See Figure 3 2 In this mode connect the ve end of the output to lout and the ve end to Vout See Chapter 3 for Switch settings and details of SINK amp SOURCE jumpers 6 Mantracourt Electronics Limited SGA A 8 SGA D User Manual Issue 2 2 Chapter 3 Settings Figure 3 1 Output Settings Switch 4 Analogue Output lalala LLL Use switch 4 to select the required output and if required the low pass filter Switches in above Figure 3 1 are all ON Table 3 1 Output Option Output Option NB Full scale output for the voltage ranges is achieved with a bi polar input Switch Positions On H Off Table 3 2 Switch 4 Analogue Output Options SW4 sw p Ja 3 4 8 Te I7 I8 Filter out X x X x x ol m Xs erm X X X x X at Jor s x Switch settings 0 Off 12 On X Don t Care Important Low pass filtering is switched into operatio
12. to a higher rating than the enclosure Cable diameter should be between 4mm 0 16 and 7mm 0 27 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 3 Cabling Power Connection Two power supply options are available SGA A 220 230VAC 50 60Hz 110 120VAC 50 60Hz 5W Max SGA A amp SGA D 18 24V DC 5W approx 150mA fully loaded NOTE The SGA A can be powered from AC or DC sources whichever is available It is also possible to connect BOTH AC and DC simultaneously for security of power supply Figure 2 2 Power Connection MBA J o o 220 230 V AC 110 120 V AC 18 24 V DC J1eeeeee COMNIS ps qd o lie ggeeee o J2 600009 N S N Q 1 gt J3 J3 J1 Standard mains 2 or 3 core cable PVC sheathed unscreened cable will suffice for the power NOTE Connect appropriate power to the SGA AC to J3 observe correct transformer jumper placement as shown in Figure 2 2 above This diagram is also provided inside the module lid Connections to the SGA A amp SGA D input output signal and the power supply are made via 2 5mm field terminal blocks Cable entry in the cased versions is via glands in the side of the case 4 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Figure 2 3 Input Sensor Connections Screen Cable Shield
13. 3 6 9 WT iii ide rre d er Dn ea ett i det b et eee eb e 10 Spani Gain Setting Switch T iride t eer ere rd e tie enis 11 Table id ies tt rief mae eid rae tinea A Po su cadis diode dio or nett ee 11 Zero Offset Setling SWItchi2 eire e t be endet ben e es 11 able META Sane Sect na in ltt ti rabia 11 Table Oia tt ee Shahar acd reall et dees are ade dd 11 Chapter 4 Calibration onte A dieere eas 12 Ricard EE 12 Figure 4 1 Calibration Connections using Millivolt Source m 14 Chapter 5 Troubleshooting sss esse esse esse essere esser essere ennenen ennenen nenen nnne na 15 Chapter 6 Product Care dete detienen nei Hit nei nunt ni Seither n RR RR RE DERE RRiRR NNUS 17 Chapter 7 Glossary sons 18 Chapter 8 Specifications for SGA A amp SGA D Load Cell Amplifiers 21 WARRAN Tos etre eeen epo eto fei e vette wet eas en dori dom tide trai eR I M t 22 Other Mantracourt Products 2 scccccccsscceecessccceesscccticasecceeeasecceesesctceeesucedesessueceeeavancoieesesceesesseccarstes 24 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 1 Chapter 1 Introduction to SGA A amp SGA D The Strain Gauge Amplifier SGA The SGA is a Strain Gauge Amplifier converting a strain gauge input to a Voltage or current output otherwise known as a Signal conditioner The SGA provides a wide ran
14. LLENT PACKAGES DSC The Digital Strain Card D Cell The in cell Digital Strain Puck Mount this package adjacent to the strain Mount this package directly into the strain EP AAA gauge pocket Plug in and go sensor High accuracy Integrate the electronics with the load cell A quantum leap in the quality of measurement 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 Temperature compensated Unwanted Signal noise filter Sensor specific calibration Elimination induced noise on signals 24 Mantracourt Electronics Limited SGA A 8 SGA D User Manual Issue 2 2
15. Output see Chapter 3 Table 3 2 d Check Span and Zero settings SW1 and SW2 1 b For current output Check lout and lout terminals are used for Sink current output Check lout and Vout terminals are used for Source current output Check the load is connected and is not open circuit Check load does not exceed 500 Ohms In Sink mode check 15 V is present at ve terminal of load In Sink mode check the OV is connected to ground In Sink mode check the load is isolated from the load cell sensor excitation In Source mode check the ve output is common to the ve Excitation Check output SW 4 settings are correct for current see Chapter 3 Table 3 2 Check Span and Zero settings SW1 and SW2 see Chapter 3 Table 3 6 amp 3 8 TO D D G C 0 wearer na 2 Low Output This is when an output is present but not of sufficient magnitude to meet the required value b Check power supply is within specified limits i e is not low c Check the sensor is connected typically reading 350 Ohm across output amp of J2 with the power off d Check the Excitation voltage J2 is at 10V DC e Check the calibration Incorrect setting of the calibration Span switches are the most common cause of low output particularly when associated with Voltage outputs Refer to the calibration instructions in Chapter 4 Refer to tutorial on the calibration set up f Check the Zero offset is correct for the sensor Th
16. SGA A amp SGA D STRAIN GAUGE TRANSDUCER AMPLIFIER User Manual Instructions MALE Maniracourt ELECTRONICS LIMITED Distributed By Applied Measurements Ltd SGA A amp SGA D Manual Contents Chapter 1 Introduction to SGA A amp SGAID sees essere reenn nner 2 Figure 1 1 SGA Signal COnGItIONGN TTT 2 Chapter 2 Installing the SGA A 8 SGA D sees re essere ennenen nenen 3 Pre Installation eden E Rs a ta pat d 3 Figure 2 1 Dimensions TTT 3 Rea AN 4 Power LODEH OD R aa ide 4 Figure 22 Power Connection nii thereto ten UD hee E pa PA E ERE 4 Figure 2 3 Input Sensor Connections oooonoccccnnnociccnonoccccnanaonnnc nano nc nc nnnn narran rra rra rr 5 A O 5 Output Conrectlons rrr ERE UH REMO AAA aaa 6 Figure 2 4 Output Corinectlons 2 t it nein E NO Pn Rr erdt e 6 Chapter 3 Settings 6 rc ntn ia 7 Figure 3 1 Output Settings Switch 4 sssssssssee enne 7 Table 3 1 Output OPONE tct 7 Table 3 2 Switch 4 niin e Renan e rid A E A ots ota 7 Table 37 oxi ob teet otio tt cadi et uti etre hl dioe Matt o esce esit 8 Output Filter Settings SWItClr9 otn eoe ri tn e eod tfo ere HO Ere eed 8 Table 3 4 Switch 9 inni redo ted eed n b i rte a eq Dn re di eq d e 8 Table imac eite m tdt ote ibt e eei dedu aed etti ooo Sita i eect 9 Output Current Mode Settings Jumpers JP1 amp JP2 sese 9 FIJUG 25 2 ii do e Sie oe LER ur 9 Span Gam Setting Switch ec re re re re tne er atriis 10 Table
17. ce 62 Ohms Capacitance m core to core 120 pF amp core to screen 210 pF If possible segregate the signal cable from Power Cables allow a 1meter 3 foot distance from such cables Do not run signal cable in parallel with power cables and cross such cables at right angles The earth connection conductor should have sufficient cross sectional area to ensure a low impedance path to attenuate RF interference Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 5 Output Connections Two analogue outputs are available from the SGA proportional DC current and DC voltage The ranges available are as follows Output Range DC voltage 10V NB Maximum Load on voltage ranges is 2mA 5V 0 10V 0 5V DC current 0 20MA NB Maximum impedance 500R 4 20mA The DC current support both sink and source modes of operation Two jumpers JP1 amp JP2 provide the means of selecting the desired mode Figure 2 4 Output Connections Connections Current Output Sink Current Output Source VOLTAGE OUTPUT Laa lout o o OJ Supply lt CURRENT SINK UN LOAD oo0ooQ o J1I Vout n ov Supply dox CURRENT SOURCE o o OO OO J1 Suppl Load In Sink mode the ve end of the load is connected to the internal 15V supply on the SGA and the ve end is connected to the SGA output The current through the load is sunk by the SGA towards ground 0V N B In this mode neither
18. e two calibration points steps 2 and 3 e g If the required output at the low calibration point is OV and the required output at the high calibration point is 7 5V adjust P1 in step 4 to produce a change of 7 5V between the calibration points Initially the low calibration point may not produce OV at the output If this is the case note the reading e g 0 5V apply the high calibration conditions and trim P1 for the required change in output i e Trim the output for 0 5 7 5 8V Use the fine Zero control P2 in conjunction with the coarse switches SW2 3 8 and polarity switches SW2 1 and 2 to set the output to the required absolute values Each switch within SW2 offsets the output by a particular percentage of full scale as shown in Table 3 8 N B It may be necessary to repeat these steps until the required output is achieved Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 13 Figure 4 1 Calibration Connections using Millivolt Source Strain Excite Excitation Screen 0V Ref 5V Strain Input 2092999 Strain Gauge Output mV Source Calibration Connections 1 The Ref 5V should be connected to strain input and the mV source applied between strain input amp strain input 2 Set the correct switch settings on SW1 as described above using the transducer s calibration sheet supplied by the manufacturer This is normally s
19. f Environmental Approvals Carefully remove the SGA A unit from its packing Check that the unit is complete and undamaged The SGA A amp SGA D units can operated in any industrial environment providing the following limits are not exceeded Operating Temperature 10 C to 50 C Humidity 95 non condensing Storage temperature 10 C to 50 C While the unit is sealed to IP65 NEMA 4X it is advisable to follow the following installation practice where possible Minimise vibration Do not mount next to strong electrical fields transformers power cables Ensure easy access to interior of the module Install electrical protection device as the unit is not internally fused Always ensure the lid is properly fitted and all 4 screws tightened Always ensure the cable gland is sealing against the cable to maintain the IP NEMA rating Figure 2 1 Dimensions 160mm 6 5 Allow for cable entry at either end 50mm 187 80mm Mounting Holes 35 i Depth 55mm 2 16 o The 4 screws for the lid are captive and must be tightened to maintain the seal The holes for the mounting screws in the base are directly behind the screws for the lid The box must not be drilled as this would invalidate the IP rating Allow sufficient space at both sides for the cable entry The Nylon 66 cable glands are designed for ROUND cables The waterproof entry and strain relief will seal
20. ge of signal conditioning for Strain gauges Load cells Pressure and Torque transducers Figure 1 1 SGA Signal Conditioner Inputs Load Cells Strain Gauges Torque Transducers Pressure Transducers STRAIN GAUGE AMPLIFIER OUTPUT 10V 110 230 V AC 5V 18 24V DC 0 5V 0 20mA 4 20mA INPUT Offered in two versions the SGA A for 110 230V AC or 18 24V DC operation and the SGA D which is DC powered only Transducer SENSITIVITY of between 0 1 mV V and 30 mV V are possible This is achieved by a combination of gain span DIP switches and associated fine adjustment by a potentiometer Similarly transducer zero OFFSET and SCALE DEAD BAND of up to 79 can be compensated for in the module This is achieved again by a combination of zero DIP switches and associated fine adjustment by a potentiometer The module has built in FILTERS to cancel the field effects of vibration agitation and electrically noisy environment The on board low pass filter can be switched in and adjusted from 1Hz to 5kHz using a series of DIP switches A wide range of proportional output options for currents and voltages can be configured by DIP switch settings Both the AC and DC versions are based on a common board and are mounted in an IP65 NEMA 4X ABS case 2 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Chapter 2 Installing the SGA A amp SGA D Pre Installation See Specification details in Chapter 8 for details o
21. ingle card assembly The SGA has only the one Printed Circuit Board assembly on which all the 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 SGA is determined by setting the Span Gain and Zero Offset Span Adjustment 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 For instance a display span of 200 F may correspond to the 16 mA span of a 4 20 mA transmitter signal 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 temperature pressure torque or load The SGA is designed to convert this change in the of the strain gauge to a proportional electrical signal The SGA is essentially a type of Signal Conditioner that it conditions alters the 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 SGA input is designed to accept Torque Sensor Load Cell and Temperature transducers Zero Zero is otherwise identified as Offset It relates to the proportional output to the sensor input Calibration of the SGA is determined by setting the Span
22. ion assumes that the unit is providing an output that is not stuck at top or bottom of the scale See paragraphs 1 to 4 if this is the case Ensure you have the calibration set up correctly installed i e mV source and output as required 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 the temperature and 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 SGA against the problem installation before rejecting the suspect SGA 16 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 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 p
23. is 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 required b Check the sensor is connected typically reading 350 Ohm across output amp of J2 with the power off c Check the Excitation voltage J2 is at 10V DC d Check the Zero offset is correct for the sensor This is a common reason for high outputs where the offset is either omitted or incorrect for the sensor Refer to the calibration instructions in Chapter 4 e Refer to tutorial on the calibration set up f Check the calibration Incorrect setting of the calibration span switches is the most common cause of low output particularly when associated with Voltage outputs Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 15 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 screening and ensure it is correctly installed and terminated 5 Calibration This sect
24. n by setting SW4 6 ON and SW4 7 OFF Reverse these settings to bypass the filter It should be noted that either one of these switches MUST be on but not BOTH Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 7 Example 0 10 Volt output with no filter required Table 3 3 1 Output Filter Settings Switch 3 The unit incorporates a second order low pass filter which can be switched in to improve the performance and output signal quality in electrically noisy environments It can also be used to reduce the effects of high frequency fluctuations in the load or applied force to the load cell The cut off frequency of the filter is set by the DIP switch SW3 as illustrated in the table below Table 3 4 Switch 3 SEE le SEE SEE SEE I N o o o 2 o 0 Pleo Ez gt gt gt gt gt gt gt gt NOTE A SECONDARY low pass filter with a cut off frequency of 800Hz can be switched into the transducer by setting SW1 8 ON T Important Low pass filtering is switched into operation by setting SW4 6 ON T and SW4 7 OFF Reverse these settings to bypass the filter It should be noted that either one of these switches MUST be on but not BOTH 8 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Example A cut off frequency of 50 Hz setting is illustrated below NOTE SW4 6 must be ON
25. pecified as sensitivity or full range output and should be in mV V 3 Ensure the Zero and Span switch settings are correct as detailed in Chapter 3 Tables 3 6 amp 3 8 4 Apply the known low calibration conditions and fine adjust P2 5 Apply the known high calibration conditions and fine adjust Pl 6 Repeat steps 3 and 4 until the required output is achieved Hint If the required output at the low calibration point is OV and the required output at the high calibration point is 7 5V adjust Pl in step 5 to produce a change of 7 5V between the calibration points Initially the low calibration point may not produce OV at the output If this is the case note the reading e g 0 5V apply the high calibration conditions and trim PI for the required change in output i e Trim the output for 0 5 7 5 8V 14 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Chapter 5 Troubleshooting 1 No output a Check power supply is present LED is on b Check the output connections are correct c Check terminations ensure insulation is not trapped in terminal cable break etc d Check the sensor is connected typically reading 350 Ohm across output amp of J2 with the power off e Check the Excitation voltage J2 is at 10V DC 1 a For voltage output a Check V out and V out terminals are wired b Check the load is connected and is not open or short circuited c Check SW4 settings are correct for Voltage
26. rocedure 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 contact your supplier for a copy In the unlikely event you have problems with the SGA 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 settings of the switches and links on the SGA card The calibration figures for the attached sensors The instrument loop to which the output is connected A record of the normal output if applicable A maintenance record of the SGA A contact phone number from the supplier for assistance Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 17 Chapter 7 Glossary American Wire Gauge The total noise floor f
27. rom all sources of interference in a measurement system independent of the presence of a data signal See noise readings that it s reading can be correlated to the actual value being measured CMR The ability of an instrument to eliminate the effect of AC or DC noise Common Mode between signal and ground Normally expressed in dB at dc to 60 Hz One Rejection type of CMR is specified between SIG LO and PWR GND In differential meters a second type 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 Deadband hysteresis Hysteresis In a digital controller there may be one switching point at which the signal increases and another switching point at which the signal decreases The difference between the two switching points is hysterisis factors including change in ambient temperature time and line voltage connected along with a DC supply for additional security The external application of electrical voltage applied to a transducer for normal operation Fine Adjustment The 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 gauges output Gain Gain is otherwise identified as SPAN It relates to the proportional output to the sensor inpu
28. t Calibration of the SGA is determined by setting the Gain Span and Offset Zero The amount of amplification used in an electrical circuit Ground Earth 1 The electrical neutral line having the same potential as the surrounding earth 2 The negative side of power supply 3 Reference point for an electrical system Input Impedance The resistance measured across the excitation terminals of a transducer 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 Load cell The load cell is one of a series of Strain Gauge sensors that the SGA input is designed to accept Torque Sensor Pressure amp temperature transducers output This can be set to suit the installation from DC to 5kH Millivolt One thousandth of a volt 10 volts symbol mV 18 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 NEMA 4 UL Type 4 A standard from the National Electrical Manufacturers Association which defines enclosures intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain splashing water and hose directed water Noise An unwanted electrical interference on the signal wires output
29. the offset nearest to that required with the switches use the fine potentiometer P2 to achieve the final setting Sensitivity Select the sensitivity as detailed in Chapter 3 Table 3 6 by means of SW1 Switches 1 4 of SW1 provide fine setting of the SGA sensitivity while switches 5 7 give coarse control This arrangement allows the SGA to cover a wide range of strain gauge sensitivities without sacrificing stability and ease of set up Locate the required sensitivity in the table and set switches 1 7 of SW1 accordingly Potentiometer PI provides fine trimming and range overlap to enable the SGA to be calibrated precisely to any given value within its ranges NOTE 1 If the range is repeated in the table e g 4mV V 4 0 4 05 and 4 0 mV V choose the setting which has the greatest number of switches 1 4 set to off i e SW1 1000 000 This will enable finer trimming to the final value using potentiometer PI The sensitivity settings shown in Table 3 6 assume that the load cell is fully loaded The sensitivity settings can be used to maximise the output when the full range of the load cell is not being used Here are a couple of examples Example 1 A 2 5mV V loadcell provides 10V for an IOOlb load However it is never loaded above 50lb The sensitivity setting can be set to 1 25 mV V Table 3 5 20 1 20mV V SW1 1101 000 Example 2 When a reduced output is required from a fully loaded transducer use a less sensitive switch setting
30. ve material and workmanship for a period of 3 three years from the date of dispatch If the Mantracourt product you purchase appears to have a defect in material or workmanship or fails during normal use within the period please contact your Distributor who will assist you in resolving the problem If it is necessary to return the product to Mantracourt please include a note stating name company address phone number and a detailed description of the problem Also please indicate if it is a warranty repair The sender is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit Mantracourt warranty does not apply to defects resulting from action of the buyer such as mishandling improper interfacing operation outside of design limits improper repair or unauthorised modification No other warranties are expressed or implied Mantracourt specifically disclaims any implied warranties of merchantability or fitness for a specific purpose The remedies outlined above are the buyer s only remedies Mantracourt will not be liable for direct indirect special incidental or consequential damages whether based on the contract tort or other legal theory Any corrective maintenance required after the warranty period should be performed by Mantracourt approved personnel only 22 Mantracourt Electronics Limited SGA A amp SGA D User Manual Issue 2 2 Figure 8 1 Connection Details uoneyoxg
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