1/19/2009 12:53 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hi Solar Element, - please tell me more about your sensor and the sensorsignals (data sheed) you put into the logo, - LOGO!-series 80BA5 0r 0BA6) - and at witch module typ(basic or AM2) your signal gomes into the LOGO! - and the formula to calculate about the sensor values the value in kWh Best regards Betel |
Last edited by: Betel at: 1/19/2009 1:29 PM==> Meine TAG-Listen: "deut." |
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1/20/2009 11:04 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hi Paolo, many thanks for the comprehensive description. Range of values (Minimum value, peak value) for Which requirements exist onto the resolution of the result in kWh? I understood that so, that the time values "tn" can be chosen dependently on the pulse frequency of the volume flow meter (or should?). Is that correct? Or the values of the tn length are supposed to be always of the same size (and in which range of values)? For which LOGO!-type (0BA5 / 0BA6) the solution is supposed to be generated)? And the PT100-sensors are connect over a Module LOGO! AM2 PT100?. If not I need the translation temperature to voltage). Witch values you want to know or display additional to kWh? |
==> Meine TAG-Listen: "deut." |
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1/29/2009 10:03 PM | |
Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating:
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Hi Paolo, now i can present you my final solution(s) for your posted aims. The LOGO! and special the series 0BA5 give us some difficult problems to solve: The EXCEL-file "Energy_meter_calculations.xls" perhaps can help you to understand my way of solution. One result is, that the measuring/caltulation of energy kWh can done without the know of the time distancs of the sensor pulses (because the volume is constant 10 l). The suitable scaling of the values and the calculation steps are most importent to get a solution. Please look at the comments at the files. Look at "DEMO_energy_meter_kWh_V1.lsc" how to calculate and display energy kWh. Page 1 contains the inputs and there preparation. I implementedtwo versions to get/calculate the temperatur difference! At page 2 you find the part to add the smal fractions of energy evers puls and creates an internal puls to count the result sum of energy. Optional you can use pulses to external application(s). The file contains two methods to display the result... The second version "DEMO_energy_meter_V2 (with flow rate).lsc" containe an extension of file "..V1.." to mesaure/calculate the flow rate (at page 3). To measure the time between two pulses is no solution, because a division with this value is impossible. I used the way over the detection of n pulses per time window, based at my circuit "Demo_Threshold_trigger_en.lsc". The easier use of the internal block "threshold trigger" is not realy possible, because no scaling and no use of the resuls is possible then. The third version "DEMO_energy_meter_V3 (with heat power kW).lsc" containe an extension of file "..V2.." to calculate the heat power in relation of the detected flow rate. But, because there is no multiplication with a measured time (between two pulses) with LOGO! 0BA5 available, i used the n possible results of flow rate to select a calculation way ("flow rate * cp" as explicite constant values; at page 4) to display a value for the actual heat power (= at the last time window = 300 s). Now a additional comment: I have found a difference working of the version 5 and 6 of the Software LOGO!SoftComfort. Remember that the circuit part at page 2 in "DEMO_energy_meter_kWh_V1.lsc" works well in LSC version 5 and 6 and at a real LOGO!-module . Look at the file "DEMO_energy_meter_kWh_V1b (LogoSoftComfort_V6).lsc", witch works well with LSC version 6 - but not with LSC version 5. Sorry but i dont now what a real LOGO! is doing with that circuit version V1b. It should work well - please test this and tell me your result. If it works well too, then you can change all versions V1 to V3 of my solution files (that saves blocks). AttachmentFORUM_Energy_meter_01.zip (2993 Downloads) |
==> Meine TAG-Listen: "deut." |
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1/30/2009 9:45 AM | |
Posts: 40 Rating:
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Hi Betel, many thanks for your time and professionality. As soon as possible I'll take some time to study your solution. Thanks in advance Best Regards Paolo |
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