Odd power sampling on power-on?


#1

Hi:

I noticed the behavior shown in the figure below during several power-off-on cycles. We were making changes to the installation and had to remove power from the Iotawatt a few times. Although the monitored power remains mostly constant, something seems odd on he first sample after power-on. As can be seen, the power is sampled too low in relation to the actual power. Could it be that sampling begins before signals are steady?

Thanks a lot,

 Carlos

#2

I think it has to do with steady state, but not the electrical signals, they should be OK instantaneously. My guess is that it has to do with averaging over the interval you are plotting. I’ll look into it, but could you zoom in to 5 second interval on one of those droops, and also show the cvs data for that segment?


#3

Thanks. Here’s it is. If you need anything else, just let me know.

Carlos


#4

I can’t reproduce this with inputs. Are those plots of calculated outputs, and if so, can you post the outputs configuration menu that shows the functions?


#5

Totally forgot about this one; probably because it’s not a major issue.

These are the outputs. I’m also adding the inputs, just in case. Version was 02_03_10 at the time.

Thanks.

Outputs


#6

Note the last item.