question

wnic1 avatar image
wnic1 asked

EM530 with PV on phase 2

Hi

I have a EM530 meter connected to a cerbo gx, the grid is on phase 1 and the pv inverter is on phase 2 using CT's. The meter is set to 3 phase mode otherwise there is no current shown(voltage shows fine in 2 phase mode)

Every time the cerbo restarts it changes the meter to run in 2 phase mode which stops it from reading current and you have to change it on the meter back to 3 phase mode

This seems like a bug? is there any way to stop the GX from configuring the meter?


Thanks

Energy Meter
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2 Answers
wnic1 avatar image
wnic1 answered ·

I found this while going through the code, so it may already be fixed when the next version comes out

em500: Always use Measuring System 3Pn

EM500 doesn't seem to like 2P mode. Power cancels out and the
piggy-backed PV-inverter is not correctly measured.

https://github.com/victronenergy/dbus-cgwacs/commit/fe2055d037230b198b82654085728d3a702a591d

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rickc answered ·

I’m using the EM530 for USA split-phase L1 and L2. Similar problem, but have to manually reset the EM530 to 2P whenever the power goes out, or I reboot my Cerbo GX. It keeps going back to 3P mode, which I don‘t want. The fix must be done in the source code above, or use MODBus commands programmatically to reset the EM530 to 2 Phase mode. In my case, the extra L3 phase is just an annoyance.

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dashti1995 avatar image dashti1995 commented ·
Apologies, this is not an answer to your question. I have trouble finding the meter on the GX. I am using the correct cable and the EM530 meter. Is there any special setting to be done on the meter to be shown on the energy meter?


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jwy224 avatar image jwy224 commented ·
Hey rickc I'm have some trouble setting my em530 up with the American grid. Was hoping you might help me with some settings. Mine does the 2 phase to 3 phase thing with is bla but not important to me at this time. My biggest problem is the CT modifier. The setting on the em530 it's like 1 to 2000.which number are you using?
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rickc avatar image rickc jwy224 commented ·

@jwy224 I have 40:1 ratio CTs, so my number is 40.

This means that at 200A though the CT, it will put out 5A to the EM530.

You need to have 5A CTs like these:
https://www.amazon.com/gp/product/B0B91R55TS

If possible, check the specification on your CTs.
Be sure you never put current through them without them being connected to the EM530, and make sure one leg of the CT is grounded for safety.

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jwy224 avatar image jwy224 rickc commented ·
Thank you very much!
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