rbuoncri Subsequently, it immediately would not track properly. See attached photos.
Did this guide graph run-away occur after an Auto Meridian Flip that is initiated by ASIAIR, or was it after a manual meridian flip that you had initiated by sending a GOTO to the mount after target has crossed the Meridian?
The reason I ask is that after an Meridian Flip, the x-y (camera sensor coordinates) to RA-Dec (sky coordinates) mapping in the small Calibration Data popup (the little diagram when you tap on the "i" with a circle in the Guide window that has blue and red vectors) need to also be flipped.
The following is taken from the PHD2 User Guide ( https://openphdguiding.org/PHD2_User_Guide.pdf ):
"If you are using a German equatorial mount (GEM), you will usually have to do a "meridian flip" around the time your image target crosses the meridian. This means you will move the telescope around to the opposite side of the pier and then resume imaging. Doing this invalidates the original calibration, typically because the declination directions are now reversed.". (Emphasis is mine.)
If you are performing a Meridian Flip manually, you will need to either recalibrate the autoguiding, or slide the "Flip" control in that small "Calibration Data" popup window.
If you don't flip the Calibration Data, instead of applying a small pulse to correct the mount's error, ASIAIR will instead issue a small pulse with the wrong sign. The result is that the guide pulses will make the error worse instead of reducing the error, and cause a run-away condition, like what your graph is showing.
There could be other reasons for that guide graph that you posted, but not flipping the calibration data is the most common cause for it.
Next time you are out in the dark skies, do a GOTO to a star that is east of the meridian, and close to the celestial Equator. Bring up the Calibration Data popup and tap on the Clear button. After clearing the calibration data, ASIAIR will recalibrate when it is asked to guide.
When it is done, stop autoguiding, and note down the directions of the red and blue lines in the Calibration Data popup window.
Next do a GOTO to a star that is west of the Meridian (a German mount should go to the new target by going through the pole -- i.e., a Meridian Flip). Make ASIAIR recalibrate a second time. When ASIAIR finishes calibrating, the new red and blue vectors should be different from your first calibration. Now tap on the Flip switch in the Calibration Data popup. Are directions of the flipped red and blue vectors the same as the original red and blue directions from the first calibration? If it is, you can just use the Flip button in the future instead of having to recalibrate after a Meridian flip.
After an Auto Meridian Flip, ASIAIR should perform the Flip switch for you. If what you showed was caused after an Auto Meridian Flip, then ASIAIR has a bug where it did not flip the Calibration Data, or, as noted in the last paragraph, a simple flip does not work with your mount model.
(Be sure to always recalibrate if you ever move the guide scope, especially the guide camera angle, even if it just changing the camera angle by 1 degree. Also recalibrate when you change autoguiding parameters, like guide exposure, guide rate, guide steps, etc. I personally always recalibrate autoguiding every night even when I leave the telescope out between two different nights.)
Chen