User manual StrainBUSter
Contents
1. ON OFF 1 S2 7 1 LSB Least Significant Bit 51 52 6 2 51 52 5 4 51 52 4 8 1 S2 3 16 51 52 2 32 51 52 1 64 MSB Most Significant Bit This address is binary coded when switch is in the ON position the corresponding bit is 1 Switch 7 is the Least Significant Bit of the address 2 1 3 LED s The Strainbuster has two LED s onboard When red LED blinks with a frequency of about 0 5 Hz this indicates that the firmware is normally running When communication on the CAN bus is detected the green LED with light for 0 5 seconds With constant communication on the CAN bus this LED will light always Page 8 van 27 Peekel Instruments 2 2 Software settings The following settings can be made by software Type of measurement Quarter bridge PT100 temperature Half Full bridge User manual StrainBUSter V1 2 DC input The standard StrainBUSter has the following ranges Quarter bridge PT100 temp Half Full bridge DC input 3500 Range setting 3500 um m 2 2mV V 5 5 mV 16000 um m 8 8 mV V 20 20 mV 70000 um m 90 110 C 40 40 mV V 100 100 mV 100 300 C 250 250 mV The StrainBUSter with the potentiometer option has the next ranges Quarter bridge PT100 temp Half Full bridge DC input 3500 Range setting 3500 um m 2 2 mV V 5 5mV 16000 um m 8 8 mV V 20 20 mV 70000 um m2. PEEKEL INSTRUMENTS User manual StrainBUSter PEEKEL INSTRUMENTS B V INDUSTRIEWEG 161 3044 AS ROTTERDAM TEL 010 415 27 22 FAX 010 437 68 26 EMAIL sales peekel nl PEEKEL INSTRUMENTS GMBH BERGMANNSTRASSE 43 44809 BOCHUM TEL 0234 904 1603 FAX 0234 904 1605 EMAIL info Peekel de Peekel Instruments User manual StrainBUSter V1 2 Contents 1 Introduction sisses ence cee cae eee 4 1 1 qa d prod su 5 1 2 StrainBU Ster 6 2 StrainBUSter configuration eneoc re Ceo rp 7 2 1 Jumper Settings eser ees ee tute exer ever exec yea exe ea eye exe p ey b i i Reg 7 WESTIN PEE 8 2 1 2 bus dipswitch settings coercere nnne innt 8 orb de a t ttt ttt te 8 2 2 sten Ergo 9 2 2 1 Measurement 9 2 2 2 Automatic 10 3 Measurement INP e 11 3 1 Measure connector a e Mo ooa 14 3 2 Signal connections ote ep ee 12 3 2 1 Quarter bridge PT 100 2 1 1 0 1
3. 18 normal CAN bus 19 StrainBUSter network using both bus connectors 20 StrainBUSter network using one bus connector 20 max stub cable length enden 21 StrainBUSter network using one bus connector 21 CAN b s examiple a t neal eden Len 22 Release datum Maart 2004 J H Steeneveld Page 3 van 27 Peekel Instruments User manual StrainBUSter V1 2 1 Introduction There is an increasing tendency to study the behavior of large mechanical constructions like bridges wind turbines tower cranes etc under varying load conditions Usually it is quite inconvenient to apply half or full straingauge bridges onto such constructions for which reason mostly single 1 4 bridge gauges are utilized This however usually implies cumbersome wiring to the inputs of the remote measuring amplifiers StrainBUSter has been developed to overcome these problems by placing the measuring circuit in the direct vicinity of each point of measuring Here all signal conditioning is done after which all measured values are being transported via a CAN bus to one convenient central place thus building one decentralized system In this way up to 120 measured values can be transported very reliably over longer distances One StrainBUSter module has 2 separate input channels The single s
4. Page 19 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 4 CAN bus topology As mentioned in 4 2 the StrainBUSter has 2 identical CANbus power connectors This gives the following connection possibilities 4 4 1 Using both connectors a CAN PC Strainbuster Strainbuster Strainbuster Strainbuster interface amp unit 1 unit 2 unit 3 unit 4 Powersupply Rt Figure 4 4 StrainBUSter network using both bus connectors Advantage Easy cable connection Each cable can be mounted on a single connector Disadvantage When a StrainBUSter is removed both connectors must be disconnected At that time the subsequent StrainBUSters are all cut off When StrainBUSter 2 is removed StrainBUSter 3 amp 4 are disconnected from the bus 4 4 2 Using one connector fo CAN PC Strainbuster Strainbuster Strainbuster Strainbuster interface amp unit 1 unit 2 unit 3 unit 4 Powersupply Rt Figure 4 5 StrainBUSter network using one bus connector Advantage When one StrainBUSter is disconnected all the other StrainBUSters stay connected Disadvantage A more complex cable connection must be made at the connecting points Page 20 van 27 Peekel Instruments User manual Stra
5. 12 3 2 2 Half bridge connection edocet ort otn 12 32 9 Bidge conNeCtiOM ER 12 3 2 4 Potentiometer connection 13 3 2 5 DC Signal 13 3 3 3 wire measurement 1 nnn 14 3 4 S wire megsuremierit3lralri accesible exe 15 4 CAN DUS communication conto DEREN SR ERE US 16 4 1 Bus speed versus measure 16 4 2 CAN bus GONME GION sedans orcas nrc Paste te PER De qu Ege 17 4 2 1 StrainBUSter CAN 18 4 3 PINUS su ceres 19 4 4 CAN ears 20 4 4 1 Using both connectors 2 222 2 c seeseeeeseeeeeseeeeeeeseseeeeeeeeeeeeseeseeseeeess 20 44 2 Using COMMAS CON em 20 4 4 3 Using Stub lines ise estie tron 21 4 4 4 POS CANBUS CODDeGUOf a iicet ret i ee Mor n ar ERR ends ex ER RR DLE 22 4 5 StrainBUSter network 404000 12 23 4 5 1 Communication Cable 23 49 2 Powercable ue pat EE esata Satnav ODE Ep Fab BO IDE EE Eee
6. 40 pF m nom impedance 120 Q max delay 5 ns m It is advisable to use a screened twisted pair for the communication to minimize the noise pickup A wire cross section of 0 35 mm is sufficient 4 5 2 Power cable Also each StrainBUSter unit needs some power A power supply can be mounted near each StrainBUSter unit In this case the zero line of each power supply must be connected to a common ground to prevent the common mode of the CANBUS signal being too high Another solution is to use 1 central power supply and to connect each StrainBUSter module to this power supply Now care must be taken that the voltage drop on the cable is not too high Normally a central power supply voltage will be 24VDC nominal The minimum power supply voltage of a StrainBUSter is 10V For calculations the maximum current drawn by each StrainBUSter unit is 0 1A To calculate the voltage drop on the cable the cable resistance must be known The next table holds typical values of the single conductor resistance Cross section AWG Number of wires Single conductor mm in each resistance at 20 C in conductor Q Km 0 141 26 7 132 0 227 24 7 77 5 0 355 22 7 52 6 0 563 20 7 32 5 0 897 18 7 20 4 1 43 16 7 12 8 note these are typical values that can differ for a specific cable Check the cable characteristics for exact values Page 23 van 27 Peekel Instruments User manual StrainBUSter V1 2
7. EXER EE REEF ESO ERE 23 4 5 3 Recommended CAN bus cable 25 5 Specifications dn e n quM UD MAE DNE 26 Page 2 van 27 Peekel Instruments Figures Figure 1 1 Figure 1 2 Figure 1 4 Figuur 2 1 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure 4 1 Figure 4 2 Figuur 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 7 Figuur 4 8 User manual StrainBUSter V1 2 Block schematic diagram acs aod mo dre eds 5 Panel mounting HCA F 1 Figure 1 3 DIN rail mounting HCA R 1 6 Multi unit Panel mounting HCA F 2 sss 6 Layout dip switches amp 7 Input connector pinout sc cus ro dote o aia Reste To rane Eee a 11 Quarter bridge PT100 12 Half bridge connection ciiin itece testate 12 Full bridge connection 1 1 2 2 2 02001 01150 12 potentiometer 2 2 000 13 DG signal connection oco oon ere UR I IURI E 13 a Eccc 14 eodd oec dd 15 CAN bus connector pin 17 StrainBUSter CAN Cable
8. Let us assume the following network PC with CAN interface StrainBUSter module at a distance to the PC of 20 m 30m 50m 65m 85m 95m 110 m The cable used has AWG22 conductors Voltage drop per meter per StrainBUSter unit is 0 05269 0 1 A 22 10 52 mV We call this value Vsb m Now to calculate the voltage drop at each StrainBUSter we multiply the cable length number of StrainBUSter connected and the Vsb m Keep in mind that through the first distance a current will flow to supply all the StrainBUSters dropping of course with each next unit The voltage drop at each StrainBUSter is noted in the next table from to formula value total PC StrainBUSter 1 20 7 Vsb m 1 472 V 1 472 V StrainBUSter 1 StrainBUSter 2 10 6 Vsb m 0 631 V 2 103 V StrainBUSter 2 StrainBUSter 3 20 5 Vsb m 1 052 V 3 155 V StrainBUSter 3 StrainBUSter 4 15 4 Vsb m 0 631 V 3 786 V StrainBUSter 4 StrainBUSter 5 20 3 Vsb m 0 631 V 4 417 V StrainBUSter 5 StrainBUSter 6 10 2 Vsb m 0 210 V 4 627 V StrainBUSter 6 StrainBUSter 7 15 1 Vsb m 0 158 V 4 785 So with a small number of StrainBUSters the voltage drop will low With more StrainBUSter units and longer distances between the units the voltage drop must be calculated to be sure that all StrainBUSters have a proper power supply Consequently cable selection for the power cable depends on the number of StrainBU
9. be connected to the CANbus This can be done with one of the following PC interfaces e USB CAN interface e LPT CAN interface e CAN interface The use of the USB CAN interface is advised in all situations except where this is not supported by the PC and its OS An example of this situation is when the PC runs under Windows NT 4 0 In this configuration an LPT CAN interface can be used This interface must be connected to the CAN bus This can be done on every location of the bus before the first StrainBUSter after the last StrainBUSter or anywhere in between When the cable length is too long for the required bus speed more than 1 interface can be used This will split the actual CAN bus in more CAN busses each with its own PC interface Strainbuster Strainbuster Strainbuster unit unit unit 22 4 Strainbuster Strainbuster Strainbuster Strainbuster unit unit unit unit Figuur 4 8 CAN bus example Page 22 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 5 StrainBUSter network cable 4 5 1 Communication cable All StrainBUSter modules in a network must be connected to a CAN bus This CANbus must be controlled by a PC The cable to be used to connect the StrainBUSter modules to the CANBUS must have the following characteristics nom capacitance between conductors at 1 MHZ
10. is used the screen can be connected to pin 1 This pin is connected to pins 1 amp 3 of the Can bus connector For each input channel a separate input connector is present Page 11 van 27 Peekel Instruments User manual StrainBUSter V1 2 3 2 Signal connections 3 2 1 Quarter bridge PT100 connection Figure 3 2 Quarter bridge PT 100 connection 3 2 2 Half bridge connection Figure 3 3 Half bridge connection 3 2 3 Full bridge connection 6 5 P e 4 43 Se See aS EE SK Figure 3 4 Full bridge connection Page 12 van 27 Peekel Instruments User manual StrainBUSter V1 2 3 2 4 Potentiometer connection Figure 3 5 potentiometer connection For this potentiometer measurement the jumpers configuration of the half bridge must be used 3 2 5 DC signal connection 6 y 9 E eeocooccp Ex 2 1 Figure 3 6 DC signal connection For this DC measurement the jumpers configuration of the half bridge must be used Page 13 van 27 Peekel Instruments User manual StrainBUSter V1 2 3 3 3 wire measurement PT100 The strain amp PT100 measurement is done with the 3 wire measurement method The following schematic explains how the wire resistance is placed in the measurement circuit Internally Figure 3 7 Input circuit diagram The wire resistance RL influences the
11. less critical situations a cheaper cable might be used Always use different pairs for communication and power lines A overall screen which must be connected to earth at only 1 side is always preferred Page 25 van 27 Peekel Instruments User manual StrainBUSter V1 2 5 Specifications General Linearity accuracy 0 1 Bandwidth 3dB 20 Hz Sample rate 100 samples second channel Operating temperature 20 C 50 C Max sensor cable length 3 m Bridge supply 2 5V fixed 0 1 Measuring input 2 channels for each unit Galvanically separated from CAN bus and power supply 3 wire single 3500 strain gauge 3 wire single 1200 strain gauge 3 wire Pt100 temp sensor 3 wire half bridge 4 wire full bridge 3 wire potentiometer DC measurement On board microcontroller A D converter resolution 18 bits Communications 1 x CAN interface Bus speed selectable between 1 Mbit sec and 20Kbit sec Power supply 10 30 VDC 1 6 VA Housing dimensions 30 105 x 68 mm h x Housings The strain buster is delivered in the following housings SB HCA R xx for DIN rail mounting SB HCA F xx for flange mounting xx holds the number of StrainBUSters modules mounted in the housing StrainBUSter types SB SG TEMP for extended PT100 measurement Standard type SB SG POT for the StrainBUSter type with potentiometer measurement Page 26 van 27 Peekel Instruments Measurement ranges User manual StrainB
12. pin layout as defined by CAN OPEN This cable must have the following connections female CAN GND CAN_SHLD CAN_L 4 5 CAN V ae front view StrainBUSter Description Sub D9 female 1 OV 2 CL CAN L 2 3 3 4 CH CAN H 7 5 10 30V Figure 4 2 StrainBUSter CAN Cable connection When the Sub D9 connector is the last CAN device on the bus a termination resistor must be mounted in this connector between pins 2 amp 7 Standard cables delivered by Peekel Instruments have this termination resistor already mounted Page 18 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 3 CAN bus termination The cables connectors and termination resistors used in the CAN network must meet the requirements as defined in ISO 11898 In addition here are some guidelines for selecting cables Recommended cable AC parameters e 120 0 impedance e 5 ns m specific line delay For drop cables a wire cross section of 0 25 to 0 34 mm would be an appropriate choice in many cases Rt Rt CAN PC Strainbuster Strainbuster Strainbuster interface amp unit unit unit Powersupply Figuur 4 3 normal CAN bus layout note Rt is the bus termination resistor with a value of 1200 This resistor is already present on each Strainbuster It must be connected through a dip switch
13. 90 110 C 40 40 mV V 100 100 mV 1 7 20 V When the potentiometer option is used measured value will be between 0 and 100 2 2 1 Measurement speed The measurement speed can be set between 10msec and 1 second in steps of 10 msec At maximum speed both channels are measured every 10 msec This measured value is an average of four values measured directly after each other The total duration of these 4 measured values is 5 msec When the measurement speed is decreased more values will be used to determine the average Both channels will still be measured every 10 msec but more values will be used to calculate an average over the measurement time Example with a measurement speed of 50 msec Channel 1 Channel 2 Time axe OO x msec 0 5 10 15 20 25 30 35 40 45 50 During the thick lines a channel is measured After 50 msec an average value is calculated for each channel Page 9 van 27 Peekel Instruments User manual StrainBUSter V1 2 2 2 2 Automatic measurement Every 10 msec both channels are measured by the StrainBUSter When a value is requested through the CAN bus the last average value is read It is also possible to set the StrainBUSter in an Auto send mode When this mode is active the StrainBUSter will send its channel values after each measurement period So when this period is set at 60 msec every 60 msec both average channel values will b
14. Sters and cable length For the CANBUS communication the capacitance and cable impedance are important When the capacitance is larger the maximum data speed will be lower The conductors for data communication and power supply can be combined in 1 multi wire cable Page 24 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 5 3 Recommended CAN bus cable The following cable is specially developed for CANBUS communication It combines the communication and power conductors in 1 cable Make Belden Type 3082A ELECTRICAL CHARACTERISTICS 300 V UL PLTC CMG 300 V C UL AWM MAX OPERATING VOLTAGE 600 V UL AWM MAX CURRENT CONDR 25C 18 AWG CURRENT CONDR 25C 15 AWG 8A NOM CAPACITANCE BETWEEN 12 PF FT CONDUCTORS OF DATA PAIR 1 MHZ NOM IMPEDANCE DATA PAIR ONLY 120 OHMS 12 OHMS MAX DELAY DATA PAIR ONLY 1 36 ns FT MIN VELOCITY OF PROPAGATION DATA PAIR ONLY 75 MAX ATTENUATION DATA PAIR ONLY 125 KHZ 13 DB 100 FT 500 KHZ 25 DB 100 FT 1 MHZ 36 DB 100 FT MAX CONDUCTOR DC RESISTANCE 6 92 OHMS 1000 FT 20 DEG 18 AWG MAX CONDUCTOR DC RESISTANCE 20 DEG C 15 AWG 3 60 OHMS 1000 FT NOM SHIELD DC RESISTANCE e 20 DEG 1 8 OHMS 1000 FT NOM LOOP INDUCTANCE 15 AWG 174 MICROHENRIES FT 18 AWG 258 MICROHENRIES FT Note in
15. The following table gives an idea of the number of channels which can be supported at different CAN bus speeds and measurement speeds CAN bus Maximum Measurement speed speed Cable length 100 Hz 1000 kbit s 30m 91 channels 120 channels 120 channels 120 channels 800 kbit s 50m 73 channels 120 channels 120 channels 120 channels 500 kbit s 100m 45 channels 120 channels 120 channels 120 channels 250 kbit s 250m 22 channels 110 channels 120 channels 120 channels 125 kbit s 500 m 11 channels 55 channels 110 channels 120 channels 50 kbit s 1000 m 4 channels 22 channels 54 channels 120 channels 20 kbit s 2500m 1 channels 9 channels 18 channels 120 channels In the gray area the channel count is 120 The limit here is not the CAN bus speed but the number of nodes connected to the CAN bus At maximum this is 60 nodes In the above table the CAN bus load is about 80 This is possible when there are only a few bus errors The CAN bus will respond with error frames when those errors occur There must be space in time on the bus to send these frames The actual achievement of the maximum speed mentioned in the table depends on the signal quality of the bus This signal quality depends on several parameters such as e cable impedance e cable capacitance e cable screen and noise When the speed is too high for the cable length bus errors will occur which will increase the CAN bus load If the CAN bu
16. USter V1 2 Quarter bridge PT100 temp Half Full bridge DC input 3500 Range setting 3500 um m 2 2 mV V 5 5mV 16000 um m 8 8mV V 20 20 mV 70000 um m 90 110 40 40mV V 100 100 mV Only for Type 01 100 300 C 100 100 250 250 mV mV V Only for Type 02 1 7 20 V Bus speed versus measure interval CAN bus Maximum Measurement speed Speed cable length 1000 kbit s 30 m 91 channels 120 channels 120 channels 120 channels 800 kbit s 50m 73 channels 120 channels 120 channels 120 channels 500 kbit s 100m 45 channels 120 channels 120 channels 120 channels 250 kbit s 250m 22 channels 110 channels 120 channels 120 channels 125 kbit s 500m 11 channels 55 channels 110 channels 120 channels 50 kbit s 1000 m 4 channels 22 channels 54 channels 120 channels 20 kbit s 2500 m 1 channels 9 channels 18 channels 120 channels Page 27 van 27
17. e sent over the CAN bus It is the responsibility of the receiving unit to handle all those channel values When more StrainBUSter units are present on the CAN bus the load on the CAN bus will become higher when the measurement interval is shorter This can result in a load which is too high In this case the StrainBUSter units with the lowest priority that is those with the highest address number will not be able to send its channel values over the bus Page 10 van 27 Peekel Instruments User manual StrainBUSter V1 2 3 Measurement input 3 1 Measure connector At the sensor side of the StrainBUSter there are two 6 pin connectors present These are the connectors for the connection of the input signals The cable shall be connected to the counter part of this connector The numbering of the connector pins is shown in the next picture 1 gt Screen 2 EX OV 3 input 4 15 input 5 Ya 4 bridge 6 2 5V Figure 3 1 Input connector pinout The bridge supply is present at pins 2 and 6 of the connector This is 2 5VDC with a maximum output current of 20 mA min impedance 120 Q At pins 3 amp 4 the differential input is measured In case of a half and or quarter bridge pin 3 represents the voltage of the mid point of the internal half bridge With a quarter bridge measurement the internal complementation resistor is connected to pin 5 of the connector When a screened cable
18. inBUSter V1 2 4 4 3 Using stub lines The CAN bus is a daisy chain bus The bus cable must be routed from one StrainBUSter to the next StrainBUSter The use of stub lines must be avoided as much as possible However if it cannot be avoided the following guide lines must be taken into account to get the best CAN bus performance Using stub cables will always decrease CAN bus performance resulting in a lower bus speed or data transfer rate To determine the maximum stub cables length the CANopen documentation gives a rule of thumb to calculate this There is also a maximum to the sum of all stub cables CAN bus max stub max length of speed cable length all stub cables m m 1000 Kb sec 0 5 2 5 800 Kb sec 0 5 2 5 500 Kb sec 0 5 2 5 250 Kb sec 1 5 125 Kb sec 2 10 50 Kb sec 5 25 20 Kb sec 12 5 75 Figure 4 6 max stub cable length The use of stub cables will decrease the maximum trunk cable length with the sum of all stub cable lengths Strainbuster unit 3 Strainbuster unit 2 Strainbuster unit 1 CAN PC interface amp Powersupply Rt I Figure 4 7 StrainBUSter network using one bus connector Page 21 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 4 4 PC CANbus connection To control the StrainBUSter units and to collect the measured data a PC must
19. measurement error This error is found as an offset error which can be removed with a balance command and a gain error which cannot be compensated The error values in the next table are valid after a balance command at 0 um m or 0 C 3m 5m 10m 15m 0 02 0 03 0 05 0 08 Page 14 van 27 Peekel Instruments User manual StrainBUSter V1 2 3 4 3 wire measurement Strain The strain measurement is done with the 3 wire measurement method The following schematic explains how the wire resistance is placed in the measurement circuit Internally Figure 3 8 Input circuit diagram The wire resistance RL influences the measurement error This error is found as an offset error which can be removed with a balance command and a gain error which cannot be compensated Page 15 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 CAN bus communication For the communication between the PC and the StrainBUSter nodes the CAN bus is used This bus can be used with high speed over a short distance or with low speed over a long distance The maximum CAN bus speed depends on the total cable length and the cable specifications Please bear in mind that the CAN bus speed will in some cases limit the measuring speed of the StrainBUSter node 4 1 Bus speed versus measure interval As mentioned before the CAN bus speed will limit the maximum number of channel values it can transfer every second
20. re galvanically connected to each other A simple terminator resistor is mounted on the StrainBUSter If other termination is required this must be done on the connector Page 5 van 27 Peekel Instruments User manual StrainBUSter V1 2 1 2 StrainBUSter models The StrainBUSter is available in several models The basic two models are e housing for DIN rail mounting e housing for panel mounting The standard models hold just 1 StrainBUSter unit However it is possible to order a model which hold more StrainBUSter units in 1 housing In this multi unit model a connection is made between adjacent units which connects the power supply and CAN BUS of the 2 StrainBUSter units Figure 1 2 Panel mounting HCA F 1 Figure 1 3 DIN rail mounting HCA R 1 Module interconnection plug Figure 1 4 Multi unit Panel mounting HCA F 2 Page 6 van 27 Peekel Instruments User manual StrainBUSter V1 2 2 StrainBUSter configuration The operation of the StrainBUSter depends on several settings By changing these settings the user can influence the operation of the StrainBUSter The settings are made by software through the CAN bus and by jumpers on the StrainBUSter 2 1 Jumper settings The bridge compensation of the input circuit can be altered by setting a jumper The type of measurement is determined by this jumper setting The following settings can be made potm or DC Pt100 1200 HEBR CANBUS Speed set
21. s load is too high caused by bus error s or just too much channel values say 100 channels at 1000KB sec the StrainBUSter nodes with the lowest priority will not be able to send their channel values On the receiving device usually a PC this is seen as missed channel values Page 16 van 27 Peekel Instruments User manual StrainBUSter V1 2 In such a case the CAN bus load must be decreased This can be done by one or more of the following actions e Increase CAN bus speed be cautious with the maximum cable length e Set measurement speed at a lower rate e Decrease the number of channels 4 2 CAN bus connector On the CAN bus side of the StrainBUSter there are two 5 pins connectors Those are the connectors for the connection of the power and CAN bus signals The cable shall be connected to the mating part of this connector The numbering of the connector pins is shown in the next picture 1 OV 2 CL CANL 3 screen 3 4 5 410 30V Figure 4 1 CAN bus connector pin out The two 5 pin connectors are interconnected on the StrainBUSter In this way a simple daisy chain connection can be made Page 17 van 27 Peekel Instruments User manual StrainBUSter V1 2 4 2 1 StrainBUSter CAN cable To connect the StrainBUSter to the CAN interface a special cable with sub D9 connector must be used The CAN interfaces as supplied by Peekel Instruments all use the connector
22. tings S2 CHANNEL 2 CAN bus speed Maximum Cable Length 1000 Kb sec 30m 800 Kb sec 50m 500 Kb sec 100m CHANNEL 1 250 Kb sec 125 Kb sec 50 Kb sec 20 Kb sec tN on OTN 12345 6 7 8 51 Figuur 2 1 Layout switches amp jumpers Page 7 van 27 Peekel Instruments User manual StrainBUSter V1 2 2 1 1 Default settings At factory the StrainBUSter units are set at the following default setting e input 74 bridge 350 Q e CANBUS speed 500Kb sec e CANBUS address 0 When more units in 1 housing are delivered the CANBUS address starts at 0 and will be 1 higher for each extra unit 2 1 2 CAN bus dipswitch settings On the StrainBUSter several jumpers and dipswitches are present The dipswitches are used to set the node address on the CAN bus and the speed of the CAN bus The CAN bus speed is set by S2 52 1 52 2 52 3 CAN bus Maximum cable speed length Off Off Off 1000 Kb sec 30m Off Off On 800 Kb sec 50m Off On Off 500 Kb sec 100 m Off On On 250 Kb sec 250m On Off Off 125 Kb sec 500 m On Off On 50 Kb sec 1000 m On On Off 20 Kb sec 2500 m Just for reference the maximum cable length is mentioned in this table When switch 4 of S2 is in the ON position the internal termination resistor of 120 Q is connected to the CAN bus lines The CAN address is set by S1 amp S2
23. traingauge or the Pt100 sensor is connected through a 3 wire connection eliminating cable losses at the input side The CAN bus speed be set between 10 and 1000Kbit sec allowing a maximum network cable length of some 30 meters at 1 Mbit sec and 5 Kilometers at 10 Kbit sec when the correct cable is being used Each module has 2 identical sets of CAN bus connection terminals to enable easy installation of a so called Daisy Chain Network A maximum of 60 units can be connected to one bus For explanation of 74 gt gt and 1 1 bridge connections see 3 2 page 11 Page 4 van 27 Peekel Instruments User manual StrainBUSter V1 2 1 1 Principle of operation A simplified block schematic diagram gives an idea of how the StrainBUSter unit is built DC DC convertor Galvanically isolated Power for electronics Power 10 30VDC Input circuit Channel 1 CAN connectors AD convert or CAN bus Micro transceiver processor Input Opto circuit couplers Channel 2 Figure 1 1 Block schematic diagram Essential in the StrainBUSter is that the measurement electronics are galvanically separated from the CAN bus and from the power which is connected to the connector The two input channels are not galvanically separated from each other Due to this build up multiple StrainBUSter units can be connected to the same power supply without the problem that all input channels a
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