Manual 348-2 V 3.1 Page 1 01-06-2007 WEIGHTEC 348 – 2 High speed weigh processor - 4 addressable setpoints Measuring speed 436 Hz Internal resolution 21 bit RS232 or CL full duplex communication Bus-system up to 15 processors - EC approval and TC: n ≤ 10,000 e ≥ 0.3 µV Weegtechniek Holland B.V. www.weegtechniek.nl Patroonsweg 23 info@weegtechniek.nl 3892 DA Zeewolde The Netherlands Tel. +31 36 522 20 30 Fax.
Manual 348-2 V 3.1 Page 2 01-06-2007 INDEX 1 PART 1 Additional at page: Chapter Page Description 348-2 1 5 Technical specifications 2 7 - setpoints 3.1 10 - (auto) tare 3.2 11 - filters 3.3 11 46 - comport 3.4 12 24, 26, 28 4.1 13 4.2 / 4.3 13 / 14 - weighing range 4.4 14 - overload 4.5 15 - linearity 4.6 16 - filters 4.7 17 - scale division and decimal point 4.8 18 - comport 4.9 18 - bus mode with a 848 interface 4.
Manual 348-2 V 3.1 Page 3 01-06-2007 INDEX 2, 3 PART 2 Chapter Page - weight values 9.1 30 - A/D value 9.2 31 - setpoint commands 9.3 32 - system info 9.4 32 - string assembly 10.1 33 - questions / commands 10.2 34 - questions and commands 10.3 35 - communication 10.4 36 Communication Sending data strings: Receiving commands: EXAMPLES: PART 3 Table nr. Chapter Page Value switches weighing range 4.4 15 Value switches overload 4.5 16 Value switches linearizing 4.
Manual 348-2 V 3.1 Page 4 01-06-2007 INDEX 4, 5 PART 4 Chapter Page Exploded view, sealing 7.4 27 Switch functions on the main print board 6.1 21 Layout and connections 348 7.1 24 Diagram setpoint outputs 7.2 25 Diagram RS232 / CL port 7.3 26 Diagram bus interface 848 8.1 28 Layout and connections 848 8.2 29 Chapter Page EC Type Approval T 5170 12.1 48 Test Certificate TC 5164 12.
Manual 348-2 V 3.1 1 Page 5 WEIGH PROCESSOR 348 – 2 01-06-2007 DESCRIPTION 1.1 APPLICATION The CE approved weigh amplifier and processor 348, with its 4 software controlled setpoints, is used as an intelligent dosing interface en co-processor between the loadcells of an electronic scale and dosing computers and controllers, like PLC’s, PC’s, custombuilt systems i.e. Typical applications are recipe dosing with setpoints and filling and check weighers.
Manual 348-2 V 3.1 Page 6 01-06-2007 1.5 MEASURING PRINCIPLE The A/D converter proceeds according to the unique continuous integrating principle and converts at 436 Hz the analogue weight signal into a 21 bits digital value. The 348 has 5 different types of filters for stabilizing the weight data. Amongst these 3 filters especial for the setpoint comparison with automatic overshoot compensation and one manual settable filter.
Manual 348-2 V 3.1 2 Page 7 WEIGH PROCESSOR 348 – 2 01-06-2007 SPECIFICATIONS 2.1 METROLOGY CERTIFICATES Test Certificate nr. TC 5164 and Approval nr. T 5170 CE marking : EC Metrology Legislation: n < 10,000, e > 0.3 µV, impedance > 58 Ω, loadcell cable length is not limited, no EMC precautions are required : Based on 50081-1, EN 50082-1, EN 61000-3-2 and EN 45501. 2.2 LOADCELL EXCITATION Voltage Current Sense return Loadcell cable 2.
Manual 348-2 V 3.1 Page 8 01-06-2007 2.6 SETPOINT FILTERS Via setpoint start command : - Inflight filter, for the setpoint comparison only, accelerates continuous and automatically the cut off of the setpoints, controlled by continuous measuring of the speed of the weight increase. Resulting in a decrease of overshoot risks at high speed dosing - Impulse filter, for the setpoint comparison only, up to max 5 Hz ripple 2.7 NO MOTION DETECTOR Principle 2.
Manual 348-2 V 3.1 Page 9 01-06-2007 2.11 ACCURAY, STABILITY Non linearity Hysterese Reproducibility Zero return after FS Stability measuring range Stability dead load range Temperature effect on: - measuring range + dead load ,, ,, - zero output : < 0.0016 % of the full measuring range (FS) : none : > 0.0010 % of the full measuring range (FS) : 0 ppm : < 0.003 % per √ year : < 0.003 % per √ year : < 0.005 % / 30° C range -10° . . . +20° C : < 0.005 % / 20° C range +20° . . . +40° C : < 0.
Manual 348-2 V 3.1 3 Page 10 01-06-2007 WEIGH PROCESSOR 348 – 2 THE USE OF: SETPOINTS, TARE, DAMPING AND COMPORT 3.
Manual 348-2 V 3.1 Page 11 01-06-2007 3.2 TARE Function : Digital zero setting of the gross weight value with 0.1 scale division accuracy. Allowed within the complete weighing range. Taring : With tare command: X ! N CR (= set net), or built in into a setpoint executive code. See table 7, 2e column on page 45. If a tare is in operation, i.e. the weight reading is net, the gross weight value always may be requested with: X ? G CR , the tare will not be deleted.
Manual 348-2 V 3.1 Page 12 3.4 COMMUNICATION PORT 01-06-2007 See for connections PAGE 24, 26, 28 RS 232V24 / CL : The way of connection of the connection cable on the data in/output connector and switch 65/66 determine the transmission mode: Current Loop or V24. See print layout and connections on page 24 The CL is opto coupled, 20 mA, shortcut proof full floating. V24 receipt is passive, buffered up to 85 V, sending is active en buffered.
Manual 348-2 V 3.1 4 Page 13 WEIGH PROCESSOR 348 – 2 4.1 ADJUSTING : INPUT SENSITIVITY Amplifier factor: 1x . . 8x Table 1 1 Switch 2 3 Input range mV/V 0 0 0 0 - 0.25 0 0 1 0 - 0.50 0 1 0 0 - 0.75 0 1 1 0 - 1.00 1 0 0 0 - 1.25 1 0 1 0 - 1.50 1 1 0 0 - 1.75 1 1 1 0 - 2.00 01-06-2007 ADJUSTMENTS: ZIE PAG 21 : SWITCH INDELING SWITCH 1 - 3 : De digital amplifier of the 348 may be adjusted in 8 running up steps of 0.25 mV/V each.
Manual 348-2 V 3.1 Page 14 01-06-2007 Exceeding the zero limits : As soon as a zero setting should exceed the limits, the zero setting is not executed. In the data string, in digit 12, an error message appears : > or = , as well as on the internal display in the last two characters : Z > or Z = . The previous zero value is maintained and may be requested for with command : ? Z .
Manual 348-2 V 3.1 Number of divisions Page 15 01-06-2007 The leftmost switch has the highest value: 50% of 15,000 divisions, with each following switch to the right this value halves : 25%, 12.5% …a.s.o. From the number of switches at “on” the selected number of divisions may be determined . And, with the other way around, a pre-calculated number of divisions may be selected (adjusting based upon calculated values). The next table indicates the exact number of divisions per switch.
Manual 348-2 V 3.1 Value per overload switch Page 16 01-06-2007 : In the table below the value of each switch is indicated in percentage of the selected input sensitivity. F.e. at a 1 mV/V input selection, switch 1 has the value of: 54.61% x 1 mV/V = 0.5461 mV/V. With a loadcell of 200 kg and 2 mV/V output signal, switch 1 has a value van 54.61 kg. Overload range switches 38 up to 48 sw.nr. % of input sensitivity sw.nr. % of input sensitivity 38 39 40 41 42 43 54.61 27.31 13.65 6.83 3.41 1.
Manual 348-2 V 3.1 Switch functions and values Page 17 01-06-2007 : Switch 33 determines the direction of the correction: positive of negative. Correction negative Switch 33 Adjusting 34 35 36 37 Correction positive Switch % 33 34 35 36 37 % 0 0 0 1 + 0.006 0 0 0 0 1 - 0.006 1 0 0 0 1 0 - 0.012 1 0 0 1 0 + 0.,012 0 0 0 1 1 - 0.018 1 0 0 1 1 + 0.018 0 1 0 0 + 0.024 0 0 1 0 0 - 0.024 1 0 0 1 0 1 - 0.030 1 0 1 0 1 + 0.
Manual 348-2 V 3.1 Page 18 4.8 ADJUSTING : SCALE DIVISION, DECIMAL 01-06-2007 SWITCH 53 - 56 SEE TABLE 3 System : The weight value of each count from the A/D conversion is determined by the setting of switch 53 up to 56. At the same time the place of the decimal point is established. Selectable are values from x 0.001 up to x 50, see table 3 on page 41. Example : With a span setting (see 4.4) of only switch 17 “on” = 7,500 counts, and a scale division setting with only switch 55 “on” (= x 0.
Manual 348-2 V 3.1 Page 19 4.10 ADJUSTING : BUS MODE 01-06-2007 INTERFACE TYPE 848 Bridge : Up to 15 weigh processors 348 may be connected to one computer input in CL mode, via interface type 848. By selecting for each 348 a unique call number, all processors can be approached individually. Because of the short response time of max 27,5 msec, all the connected 348’s are with high speed accessible.
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Manual 348-2 V 3.1 6 Page 21 01-06-2007 SWITCHES, CALIBRATION DISPLAY: WEIGH PROCESSOR 348 – 2 6.
Manual 348-2 V 3.1 Page 22 01-06-2007 6.2 INTERNAL CALIBRATION DISPLAY The small dot matrix display on the main print board has 2 lines with 16 alpha numerical characters each. Setting switch 49 (calibration mode) high will switch on the back lightning and will double the damping of the weight reading in order to create a very stable reading of the weight value. After start up (see 6.3) both the gross and net weight values are displayed on the two lines of the display, with a 10 x higher accuracy.
Manual 348-2 V 3.1 Page 23 01-06-2007 6.3 INFORMATION ON THE CALIBRATION DISPLAY The calibration display gives the actual weight reading of both the gross and net weight values. The accuracy of the reading is 10 x higher as the selected scale division. Moreover there are important and useful supplementary reports displayed, see chapter 6.2 on page 22. Consecutive readings during initial start up of 348: After power on of a 348 each line of the display shows a running down row of black squares.
Manual 348-2 V 3.1 7 Page 24 01-06-2007 PRINT LAYOUT, DIAGRAMS: WEIGH PROCESSOR 348 – 2 7.1 LAYOUT AND CONNECTIONS MAIN PRINT BOARD calibration and info display o con. 33 sw 49 - 56 65 / 66 sw 57 - 64 12 setpoints (8 .. 12) led signals of : RS in 1 z RS out con. 32 Trafo 1 230 VAC RS/CL 5 RS / CL in / out 1 loadcell (1 .. 7) 12 con. 23 1 sw 41 - 48 L1 sw 33 - 40 Trafo 2 24 VAC 230 VAC S4 RS port test sw 67 3 sw 25 - 32 E S3 sw 17 - 24 N S2 led 4 1 con.
Manual 348-2 V 3.1 Page 25 01-06-2007 7.2 DIAGRAM SETPOINT OUTPUTS Setpoint 1, pin 8 con 33 Setpoint 2, pin 9 con 33 Setpoint 3, pin 10 con 33 Setpoint 4, pin 11 con 33 Common setpoints = GND ! ! pin 12 con 33 See for connections of connector 33 chapter 7.1 on page 24 Attention: - The Common has 0 V potential. - De Common is separated from the device’s ground by a varistor. - Only with a properly connected 348 the Common my be connected to ground (not advised).
Manual 348-2 V 3.1 Page 26 01-06-2007 7.3 DIAGRAM RS232 / CL DATAPORT + CL out, pin 3 con 32 RS 232 out, pin 3 and 4 interconnected - CL out, pin 4 con 32 + CL in, pin 1 con 32 RS 232 in pin 1 and 2 interconnected - CL out, pin 2 con 32 Shield, pin 5 See for connections of the data connector 32 chapter 7.1 on page 24 Attention: - Using RS 232 V24 communication: pin 1/2 interconnected and pin 3/4 interconnected.
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Manual 348-2 V 3.1 8 Page 28 01-06-2007 INTERFACE 848 8.1 INTERFACE 848 DIAGRAM BUS CONNECTION in CURRENT LOOP Using interface type 848 4 groups of max. 4 x 348’s may be connected in CL mode. Example of 1 group van 4 connected 348’s upon one of the 4 input connectors of an 848 interface: 348 Con. 32 in 348 Con. 32 in out + - + - Sh 1 2 3 4 5 348 Con. 32 out in + - + - Sh 1 2 3 4 5 348 Con.
Manual 348-2 V 3.1 Page 29 8.2 INTERFACE 848 PRINT LAYOUT , 01-06-2007 CONNECTIONS, HOUSING con. 2 1....6 switch 1 1......8 con. 4 1....6 con. 5 1....6 con. 6 1....6 con. 1 1 .. 3 con. 3 1....6 Connector 1 (power supply) Connector 2 (Output) Connector 3 t/m 6 : pin 1 = L1 pin 2 = N pin 3 = PE 230 VAC - 15% . . +10% 40 . .
Manual 348-2 V 3.1 9 Page 30 01-06-2007 DATA TRANSMISSION WEIGH PROCESSOR 348 – 2 There are 4 different kind of strings that may be transmitted from a 348: - Data string: - Data string: - Data string: - Data string: 9.
manual 348-2 V 3.1 Digit 12 Page 31 01-06-2007 + 1 2 = = = = Weight value increases Weight value decreases Weight value no motion Weight value no motion : speed of motion see digit 15 ? = A “set zero” command is received but the zero function is disabled with switch 5. This command will not be executed. > = A “set zero” command is received (zero track incl.) that, if executed, will exceed the zero setting range . This command will not be executed.
Manual 348-2 V 3.1 9.3 Page 32 01-06-2007 DATA STRING : SETPOINT see table: on page: 5 43 digit: data: 1 X 2 # 3 S 4 W 5 W REQUEST with: 6 W 7 W 8 W 9 W X 7 45 6 44 10 @ 11 A B D H o ? see digit 11 CR 12 CR In the continuous sending mode (call nr. 0) a requested setpoint string will be transmitted one time only. Thereafter the previous sending mode will be continued. Specifications per digit: Digit 1 X = Identification / call number, settable with switch 61 … 64.
Manual 348-2 V 3.1 10 Page 33 01-06-2007 DATA RECEIPT (full duplex) WEIGH PROCESSOR 348 – 2 There are 2 different kind of strings that may be sent to a 348: index: always a ? in the 2nd digit index: always a ! in the 2nd digit - A QUESTION - A COMMAND 10.
Manual 348-2 V 3.1 Page 34 01-06-2007 10. 2 EXPLANATION DATA STRING RECEIPT The comport is full duplex: receipt and transmission may occur at the same time. A new command for the same activity deletes the previous one if that one not yet had been executed. It is advised to send some spaces (f.e. CR’s) in between strings that are sent direct after one another. This may happen f.e. by sending several setpoint values for different (course - fine dosing) setpoints.
Manual 348-2 V 3.1 10. 3 Page 35 RECEIPT STRINGS EXAMPLES 10. 3 .1 QUESTIONS 01-06-2007 see page 33, 34 too “Set ..” indicates the call / identification nr. of a 348 A ? G CR (gross weight ?) = Set 1 -- transmit -- gross weight B ? N CR (net weight ?) = Set 2 -- transmit -- net weight J ? T CR (tare weight ?) = Set 10 -- transmit -- tare weight D ? Z CR (zero value ?) = Set 4 -- transmit -- weight value (software) zero memory A ? S A 10. 3 .
Manual 348-2 V 3.1 10. 4 COMMUNICATION Page 36 01-06-2007 EXAMPLES These examples show how a 348 in general may be used. A data string, sent from a 348, is indexed by a # in digit 2. 1 Question: Set 1, what is the gross weight ? A 2 ? G CR Question: Set 2, what is the net weight ? B 3 ? N CR Question: Set 4, what is the gross weight ? D 4 ? G CR Dosing command: Fill 20,00 kg with 2 setpoints course/ fine, first enter values, followed by start command .
Manual 348-2 V 3.1 5 Page 37 Command overload safeguard: Controls overloading with the 4th setpoint monitoring the gross weight Set 1 -- command -- setpoint -- 25000 -- executive code b (= at setpoint nr. 4 only : always compare with gross weight value, after achieved weight set on hold, active at once) -- setpoint nr.
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Manual 348-2 V 3.1 11 11.1 Page 39 WEIGH PROCESSOR 348 – 2 01-06-2007 TABLES INPUT AMPLIFIER SETTING 1 = ON (switch high) TABLE 1 0 = OFF (switch down) Dil switch nr. Input range in mV/V 1 2 3 0 0 0 0 - 0.25 0 0 1 0 - 0.50 0 1 0 0 - 0.75 0 1 1 0 - 1.00 1 0 0 0 - 1.25 1 0 1 0 - 1.50 1 1 0 0 - 1.75 1 1 1 0 - 2.00 The 348 permits the change off dil switch settings without causing differences in the other adjustments.
Manual 348-2 V 3.1 Page 40 01-06-2007 TABLE 2 11.2 DAMPINGS FILTER 1 = ON (switch high) (from nr. 1700 upwards) 0 = OFF (switch down) Dil switch nr. Filter Filter inclusive increasing adaptive filter Effect (proportional increasing damping at approaching standstill) 49 50 51 52 Hz 0 0 0 0 4.02 0 0 0 1 2.47 0 0 1 0 1.52 0 0 1 1 0.93 0 1 0 0 0.57 0 1 0 1 0.35 0 1 1 0 0.22 0 1 1 1 0.13 1 0 0 0 2.03 1 0 0 1 1.25 1 0 1 0 0.77 1 0 1 1 0.
Manual 348-2 V 3.1 Page 41 01-06-2007 TABLE 3 11.3 SCALE DIVISION , 1 = ON (switch high) DECIMAL POINT 0 = OFF (switch down) In the data strings “weight” and “setpoint” the weight value is expressed without the decimal point. However the selected value of the scale division has been integrated. The position of the decimal point can be extracted from digit 14 of the “weight” string according to the next table: Code in digit 14 of the “weight” string Dil switch nr.
Manual 348-2 V 3.1 11.4 Page 42 BAUD RATE, 1 = ON (switch high) 01-06-2007 CHARACTER FRAME TABLE 4 0 = OFF (switch down) Baud rate: Switch nr. Pause Slowed down continuous transmission with command ! E A Pause number of strings per second m sec. number of strings per second m sec. Baud rate Continuous transmission ( at call nr.
Manual 348-2 V 3.1 11.5 Page 43 01-06-2007 CALL / IDENTIFICATION NUMBER 1 = ON (switch high) TABLE 5 0 = OFF (switch down) Dil switch nr.
Manual 348-2 V 3.1 11.6 Page 44 01-06-2007 SETPOINT : NUMBERING, ON / OFF STATUS 1 = setpoint active TABLE 6 0 = setpoint switched off S1 till S4 are the 4 setpoints Code in digit : Setpoint nr. and combinations of setpoints 13 in string “gewichts” 11 in string “setpoint” The separate setpoint numbers S4 S3 S2 S1 0 0 0 0 @ 0 0 0 1 A A = setpoint nr. 1 0 0 1 0 B B = setpoint nr.
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Manual 348-2 V 3.1 11.8 Page 46 RUN CODE 1 = start setpoint 01-06-2007 START / STOP SETPOINTS, FILTER SELECTION TABLE 8 0 = stop setpoint Filter s e lec t ion Setpoint nr. @ pulse + inflight ` ! A a = start S1, stop S2, 3, 4 0 “ B b = start S2, stop S1, 3, 4 1 1 # C c = start S1,2, stop S3, 4 1 0 0 $ D d = start S3, stop S1, 2, 4 0 1 0 1 % E e and so on ...
Manual 348-2 V 3.1 11.9 Page 47 01-06-2007 WEIGH - SPEED CHARACTER TABLE 9 Digit 15 d /sec. Digit 15 d / sec Digit 15 d / sec.
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