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Saia-Burgess Controls AG

Manual for PCD2|3.W7x0

│ Document 26-

833 E

NG07 │ 2018-10-18

Configuration

3-3

Functions of the weighing module

Zero_calibration

Zero (WM_Weigh)

This command calibrates the scale to its empty state. This takes account of all

errors in the weighing system and the weight of the empty vessels (tare). This

command is normally executed just before the container is filled (this operation

can also be performed automatically).

Weighing

Weigh (WM_Weigh)

The readout of the weight is triggered by a positive signal edge at the

Weigh

input

to the FBox

WM_Weigh

. The weight can then be taken from the

Weight

output in

signed integer format.

Differential weighing

Dweigh (WM_Weigh)

The readout of the differential weight is triggered by a positive signal edge at the

Dweigh

input to the FBox

WM_Weigh

. The differential weight (change of weight

per second) can then be taken from the

Dweight

output in signed integer format.

Positive values mean that the weight is increasing, negative values mean it is

decreasing.

Functional flow for calculating the differential weight

The weighing module calculates the change in weight approx. every 250 ms, and

extrapolates up to 1 second. The same units of weight are used as for recurring

weighing.

Содержание PCD2.W7x0

Страница 1: ...Document 26 833 Edition ENG07 2018 10 18 Manual Integrated weighing and metering system PCD2 W7x0 and PCD3 W7x0 ...

Страница 2: ...s 1 1 1 2 Operation 1 2 1 3 Technical data 1 3 1 3 1 Wiring 1 4 1 4 Functional description 1 4 1 5 Signal processing 1 5 2 Programming 2 1 Function boxes 2 1 2 2 Data interchange between Saia PG5 FBoxes and weighing modules 2 6 2 3 Overview 2 7 3 Configuration 4 Operation of the weighing module 4 1 Commissioning 4 1 4 1 2 Scaling 4 1 4 2 Operation 4 1 A Appendix A 1 Icons 5 1 A 2 Contact 5 2 ...

Страница 3: ...librated weighing cells removed 2007 11 05 EN04 Chapt Ch01 3 Different connectors for PCD1 2 and PCD3 2009 07 02 EN05 Chapt Ch02 1 Reset 2013 10 10 EN06 New logo and new company name 2018 10 18 ENG07 New phone number 2015 0 2 Brands and trademarks Saia PCD and Saia PG5 are registered trademarks of Saia Burgess Controls AG Technical modifications are based on the current state of the art technology...

Страница 4: ...nnect up to six weighing cells and also obtainable cheaply in larger quantities with only one channel High resolution The internal measurement resolution supports 200 000 increments Extensive functionality As well as the classical weighing and zeroing functions differential measurement is also possible i e measuring the change in weight per second Comprehensive diagnostics The operating state of t...

Страница 5: ...s The module is suitable for implementing platform metering or batch scales e g with pellets liquids etc and for measuring forces in technical processes In commercial or safety related applications the whole system must be certified by the authorities responsible e g calibratable scales overload protection etc Overview of functions Taring For taring the current gross weight is defined as the zero ...

Страница 6: ...ding on filter 50 and 60 Hz suppression 100 dB min Weighing cell characteristics Type of weighing cells DMS weighing cells with 4 or 6 terminals Sensitivity 0 5 to 4 mV V configurable Cell supply voltage 10 VDC 0 5 V Permissible load resistance per channel 87 Ω up to 4 cells connected in parallel Terminals PCD1 2 PCD3 Plug in 14 pole spring terminal block for Ø up to 1 5 mm 4 405 5002 0 4 405 4998...

Страница 7: ...r address bit 2 1 Ready to read at selected channel 11 Command or address bit 3 1 System error at selected channel 12 Channel 0 1 1 2 Not connected 13 0 READ 1 WRITE Not connected 14 0 DATA 1 COMMAND Not connected 15 1 Execute 1 Busy 1 4 Functional description The vast majority of force cells work on the same principle and are supplied in more or less standardised versions The cells consist of met...

Страница 8: ...rter with zero current if possible 1 5 Signal processing Block diagram Rd Rd Rs Rs Supply Sense Supply Sense Signal Signal Supply 10 VDC Pre amplifier A D converter Ref Digital filter Ref Postfilter and I O interface PCD I O Bus Gain Pre amplification is by a factor of 16 3 The reference voltage is reduced to 2 85 V by a voltage divider Amplification factor The analogue converter is equipped with ...

Страница 9: ...on of Post filter Value of weighing available Time of weighing Tw Throughout the weighing process interim results can be read off Time required for weighing Of course this time is dependent on how quickly the items are placed on the scale For this description of the behaviour of the measuring equipment we will assume that the weighing unit is loaded in sudden bursts The digital filter requires 4 a...

Страница 10: ...ter 2 Post filter 5 Post filter 10 Post filter 20 Time for a measurement in ms Resolution Time for a measurement in ms Resolution Time for a measurement in ms Resolution Time for a measurement in ms Resolution 20 1 2 4 8 830 2 10 10 2 10 12 2 11 20 2 12 30 2 13 50 3 12 333 2 11 20 2 11 30 2 13 40 2 13 70 2 14 100 6 24 166 2 12 40 2 12 60 2 13 75 2 14 130 2 15 200 12 48 83 2 13 80 2 13 120 2 14 150...

Страница 11: ...th dynamic inputs are generally used With the FBoxes with static inputs the user has the choice of setting the input to 1 or 0 or of manipulating the input externally This has the advantage for example that selected functions can be performed in one step within a Graftec program and others in a different step If the weight is to be read in each cycle within a FUPLA program the Weigh input is set t...

Страница 12: ...d from the modules is collated checked and passed to the application The other FBoxes are exclusively concerned with controlling the selected scale as required by the application LifeFlag This output reports that a weighing module can no longer be addressed Timeout Timeout is set to 1 when the response from a weighing module is delayed too long Address Base address of the defective module The foll...

Страница 13: ...configuration with an empty scale The end of configuration is detected when the Still signal is displayed on reading the status of this channel Full This input triggers calibration of the scale with a check weight placed on it The scaling of the apparatus is then based on the value entered as a calibration weight in the Adjust window for the FBox Scale The input Scale is not supported by the modul...

Страница 14: ... is used to determine the status of the scale If a 1 ap pears at the Still output the user can be sure that the scale has reached a stable final state All inputs react to a transition from 0 to 1 Weigh Triggers the readout of a weight Dweigh Triggers the readout of a differential weight Zero Resets the scale to zero tare Weight Outputs the weight in the scaled unit Dweight Outputs the differential...

Страница 15: ... the noise behav iour of the weighing module the vibration of the base of the scale and the addition of the item to be weighed Status Triggers the readout of the messages Error scale empty and scale at a standstill Noise Triggers the readout of an indicator value for the stability of the scale Error Reports a system error ErrorID Reports the type of system error detected Empty If 1 the scale is em...

Страница 16: ...Saia Burgess Controls AG Manual for PCD2 3 W7x0 Document 26 833 ENG07 2018 10 18 2 Programming 2 6 Overview 2 2 Data interchange between Saia PG5 FBoxes and weigh ing modules ...

Страница 17: ...ILTER SET_PFILTER PFILTER SET_GAP GAP SET_EMPTY EMPTY SET_AUTOZERO AUTOZERO SET_LOWPASS LOWPASS CONFIGURATION Full FULL_CALIBRATION CHECK_WEIGHT Scale SET_CALIBRATION ReadO READ_OVERLOAD OVERLOAD Overload ClearO CLEAR_OVERLOAD SYSTEM_ERROR Error ERROR ErrorID Weigh READ_WEIGHT FBox WM_Weigh Address Channel WEIGHT Weight Dweigh READ_DWEIGHT DWEIGHT Dweight Zero ZERO_CALIBRATION Status READ_STATUS F...

Страница 18: ...f the A D converter can be preset in a range from 20 to 2 000 This represents a conversion time of 1 2 to 120 ms Filter values selected from the Filter table Set post filter Pfil At the output from the A D converter the average of a predefined number of weight measurements is calculated This number is assigned values from 0 2 to 20 With values 0 and 1 the averaging is deactivated Admitted staggeri...

Страница 19: ...e in encoded form Lowpass Time constant for the filter 0 0 25 seconds 1 0 5 seconds 2 1 second 3 2 seconds 4 4 seconds 5 8 seconds 6 16 seconds 7 32 seconds Check weight This parameter is set to different values for scales calibrated with a check weight and scales that work with calibrated weighing cells Calibration with check weight A 1 at the Full input calibrates the scale to the check weight T...

Страница 20: ... signal edge at the Weigh input to the FBox WM_Weigh The weight can then be taken from the Weight output in signed integer format Differential weighing Dweigh WM_Weigh The readout of the differential weight is triggered by a positive signal edge at the Dweigh input to the FBox WM_Weigh The differential weight change of weight per second can then be taken from the Dweight output in signed integer f...

Страница 21: ...r reached on the weighing cells Most commercially available weighing cells are guaranteed to withstand overloading up to 150 of their nominal load without damage But it it quite common especially with small weighing cells for them to be more heavily overloaded The overload read off may range from 110 to 390 The cell overload is permanently stored in the weighing module and is overwritten each time...

Страница 22: ...the Empty parameter The permissible range for Empty is from 0 to 255 One unit represents 2 16 of the nominal loading of the cell Error This output signals that a system error has been detected in the weighing module or in the weighing process itself As a general rule all errors in a measuring system are reported with the Error status signal At the same time a description of the type of error is wr...

Страница 23: ...o great the whole procedure must be repeated The scaling value is then stored automatically and reused at each startup 4 2 Operation The operation of the scale normally runs as follows Run Zero just before weighing while the scale is still empty Load the scale There are now several possibilities Weigh and analyse continuously with Weigh Wait for the status signal Still and read off the final weigh...

Страница 24: ...s the reader of the risk to components from electrostatic discharges caused by touch Recommendation At least touch the Minus of the system cabinet of PGU connector before coming in contact with the electronic parts It is better to use a grounding wrist strap with its cable attached to the Minus of the system This sign accompanies instructions that must always be followed Explanations beside this s...

Страница 25: ...rd 41 26 580 30 00 Telephone SBC Support 41 26 580 31 00 Fax 41 26 580 34 99 Support E mail Support support saia pcd com Support site www sbc support com SBC site www saia pcd com International representations SBC sales companies www saia pcd com contact Repair Postal address for customers to return products in Switzerland Saia Burgess Controls AG After sales service Bahnhofstrasse 18 3280 Murten ...

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