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Logo as a kwh meter

Created by: chif at: 2/10/2012 5:50 PM (6 Replies)

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2/10/2012 5:50 PM	Rate (0)
chif Posts: 15 Rating: (0)	Hi i have read the treads about using the logo as a kwh meter but i cant find anything about higher currents and voltage . I want to messure three fases whit 230 V at each fase and a current up to 400 A, i have three curret transformers how can give me 0-10 V or 0-20mA, Can this be possible? Best regards Jonny Jansson
chif Posts: 15 Rating: (0)
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2/10/2012 9:09 PM	Rate (0)
Betel Posts: 1690 Rating: (584)	Hi,, yes i think so.....tell us your application: hardware (LOGO, sensors, transfromers value ranges to measure, calculateted, displayed values with resolution and units you want and so on....then we have an idea of that you want and per haps we can help you. In that forum (en and de) you can find some different circuits to measure and display kWh-meter from me - lokk and get some ideas waht can be... Best regards Betel
Betel Posts: 1690 Rating: (584)
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2/11/2012 3:14 PM	Rate (0)
chif Posts: 15 Rating: (0)	Hi Ihave a LOGO! OBA07 whit AM2 module, current transformesr are Carlo Gavazzi whit a range of 0-400 A The output of those are 0-10V altenetiv 0-20mA. The volt meters output is 0-10V range 0-250V I want to display current of the three phases and Kwh of the three fases, I think i can handle the programing for the display, but having problem to show actual currnet value and KwH. Best regards Jonny
chif Posts: 15 Rating: (0)
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2/11/2012 4:26 PM	Rate (1)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	I have an example for you. You must know that a LOGO no greater numbers than 32767 can handle. The program therefore I make use of 0-40 Ampere as input so that the numbers are not too large. This is corrected, the correct value is in the display. It is not quite right, you're only using 1 voltage measurement, but this is easy to adjust. Further comments in the example. Attachment kWh1.zip (1148 Downloads)

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This contribution was helpful to 1 thankful Users umencho

2/11/2012 4:46 PM	Rate (0)
chif Posts: 15 Rating: (0)	Thanks i shuold try this out ill post a comment about the results Best regards Jonny
chif Posts: 15 Rating: (0)
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2/13/2012 9:14 PM	Rate (0)
Betel Posts: 1690 Rating: (584)	Hi Jonny, sorry, but the answer before uses the product of A * V as kWh, but it is only the momentan value kW. To measure the Avalue use one amplifiver with Gain = 4; Offset = 0 and 1 digit after zero point for displaying. To measure theVvalue use two amplifiver with, both withGain = 5; Offset = 0 and2 digits after zero point for displaying. To display the momentanly power A * V use a math Funktion and calculate A * V / 100 -use 2 digits after zero piont and then you can displax xxx(,)xx kW. To measure or calculate the power in units kWh please look my answers and circuits at kWh counter for wind mill by LOGO Of couse, you must change some parameters to solve your problem and make it usuable for your sensor inputs.... If i have time and you give me some infos, then can i give you some more ideas to use my circuit. If your application use thefull sensor ranges up to 250 V and 400 A, then it is possible to measure the power in a resolution of 25 Wh. If the real value ranges are smaler, then ist is my be possible to get a betterresolution... Best regards Betel
Betel Posts: 1690 Rating: (584)
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9/29/2015 1:47 PM	Rate (0)
Min_Moderator Posts: 4758 Rating: (122)	New question published by Nieminenracing is split to a separate thread with the subject Software to read and log data from kwh meter pulse output?. Best regards Min_Moderator
Min_Moderator Posts: 4758 Rating: (122)
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