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MCC 128 odd behaviour?


NicR

Question

I have an MCC 128 attached to an AT 50 B10 split core current transformer. I'm running the logging demo & getting some odd results.

I have a mains cable (UK) running through the CT which sould be reading 0 as both the live & the nutral are threaded through but I'm getting a ±7 VAC signal instead!

Sketch of set up,

image.png.5ad94f1c752cfdce87d1661481b50748.png

 

The CT should be giving a voltage between 0-10V depending n the current through the threaded cable (& in this case it should be 0 as the nutral is included) but instead I get..

image.png.b8db089158de639873bb5b3978049292.png

 

Any idea whats going on here?

Edited by NicR
typos
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