Meaning of PlTilt and PlAzim

[Helios210]

What do the quantities PlAzim and PlTilt refer to?

I often get erratic values in my hourly output file such as:

PlAzim

-90

0.0014

90

PlTilt

40.365

52.692

60

36.509

9.2845

0.0009

What are these numbers indicating?

Thanks,

H.

[André Mermoud]

These values are simply the plane tilt and plane azimuth of your tracker, at a given time.

I don's see in which way they are erratic: these are calculated from the tracker's position (phi angle, axis tilt and azimuth, depending on the tracking mode) and are quite real angles.

[Helios210]

Hi André,

Thanks for the reply - I meant no disrespect!

My comment about the erratic nature was more referring to the PlAzim values. This output was achieved using a single axis tracker so I didn't understand why the azimith changed.

Thinking on it though I realize that one could interpret it as a change, and the very small 0.00014 value is when the tracker is at, or very close to the stow position - this clears up my miss-understanding so thank you.

Best,

H.