3 wire delta

fbliman

Hi, I have just got a pro 3em 3ct63 for mesauiring my home supply (one phase gets down quite often) so I want to monitor to avoid getting my motors broken.

The supply here is 3 wire delta 230V phase to phase. I conected the jelly but is does not start. I guess that the power supply is LC-N, and as I do not have N it does not start.

2 questions-

-If I conect LA or LB to N, will it start (it will get 230V LC-N(LA))

-If I get it to start in that configuration, can I later change the setup so that it measures the power in delta configuration, or it only works for Y configuration?

Thanks!

thgoebel

According to the two-watt-metre method, only two current converters are needed in a delta arrangement (example: phase A and B), phase C is used as a reference point. The measurement of the total performance is herewith correct.

With a Shelly pro 3EM-3CT63 two phase wires are threaded through holes A and C. The cables A and C of the CT unit are plugged in the appropriate sockets (A and C). Socket B is left open. Voltage is fed to terminals A and C (each from a fuse with phase A and C). Terminal B is left open. Phase B wire is connected to terminal N of Shelly.

fbliman

Thanks!

Do you think that conecting phase B to LB and N, at the same time, can create a problem?

fbliman

i conected phase B to N and it strarted! great.

Is there any way to program directly to output the power via the app, or I have to do the calculations in my own script?

thgoebel

The figures in the app should be valid!