Thank you for all the anwsers!
1. I actually meant Heat Pump, the one with the outside and the inside unit, that heats the radiators in the house.
2. I belive it is connected with three phases with no neutral ( I can only see the three wires with 16A 400V fuses), but I'll have to check. Would measuring the power still be possible without the neutral wire, if I were to use those, since they only handle 250v? If yes, how would I connect it?
3. I have no intent of switching off any of the devices, only use them for measuring the power.
4. I found ordered a bundle of 3 of them already. I saw on a couple of videos, that you can flash the chips inside, so they send the information (Voltage, amperage and freqency) to your server and you can use that to make graphs or whatever you please. I think It would be a fun project and measuring the power consumption of that Heat Pump was just something I thought of, since I am interested how much it actually spends in those really cold days vs on milder days. Of course I would only begin wiring up those after extensive testing with large loads ( I mean they are pretty cheap so I need to make sure, they can handle the rated power ) and after setting up the server and graphs and everything.
So my main question is , If it is possible to measure three phase power with those, and one per phase and how would I go about wiring those up.
Thank you for your anwsers
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Lol, I even know better, but made a common error...You said "power", many of us gave you current...Thank goodness at least a few responders got that right...And by the way that ABB unit is an ENERGY meter, also not the same.Current = aof power, along with voltage and power factorPower = instantaneous reading of all of the above, aof energyEnergy = power integrated across timeSo as others posted, if you want power, you need a power transducer. You can in theory do it with a voltage transducer and a set of current transducers, but getting true power factor involves comparing wave form displacement and is difficult to do accurately in a PLC. Better to just get a power (kW) transducer that does that inside for you and gives you a simple analog output to go to your PLC.
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