UIA-0402N and UIA-0800N Issues

[Rog]

So we have several of the unistream units out there. But recently the last 2 we built with the exact program on them. Are having issues with analog inputs. They started to jump all over the place. Tried different signal wires same reading. Multi meter run series and analog signal not jumping all over the place, just smooth reading. I don't know if it the modules or the last firmware update.  Was wondering if you guys had any thoughts.

Thanks

Rog

[Ausman]

Have you run your meter over all the power and earth lines?  Modules are commoned to the supplies providing the sensors?

cheers, Aus

[AlexUT]

Hi Rog,

Please find a scope and check if there are EMI at modules inputs.

Please add connection diagram.

B.R.

 

[dierkens]

I know this is an old post but we're having a similar problem and wanted to know if the OP ever resolved this issue.

We've got it setup in an engineering office with no high power sources nearby.  The signal wires placed into another device don't show this fluctuation at all.  

If I don't get a response I'll create a new post.

[Joe Tauser]

You may have common mode noise.  I always ground the 0V of my 24V power supply to whatever AC source is powering it.  If that doesn't help, get your scope out.

Forward your request to Official Unitronics Support - support@unitronics.com.

 

Joe T.