Astro-Physics position error on slew-back near meridian [subj changed]

[Larry Owings]

I had a problem with my AP 1200 mount not pointing correctly when going to a new target after completing the run on the first target. The last image finished and plate solved in ACP. It was the 50th image of the run which involved a mount flip between images 18 and 19. This worked perfectly. After plate solving image 50 the scope was at Az = 225d 30' 57" Alt = 27d 50' 36". The slew to the new target should have taken it to Az = 179d 32' 24" Alt = 36d 55' 25". After the slew ACP did a pointing exposure and could not solve it. After three attempts at taking pointing exposures and failing to plate solve the ACP plan script aborted and the script fail script ran, which simply parks the scope and closes the roof. The mount went to what was supposed to be park position 1. It wound up with the Az axis at 187.86 deg. (it shold have been 180 deg.) and Alt axis st 36.65 which points the scope toward the floor. ACP reported the f inal position as Az: 187.86, Alt: 36.65. At this point the roof would not close because of the limit switches I have on the mount that will not close unless the mount is in park position 1.

It seems to me that somehow the mount got confused as to whether it was to flip or not when going to the new target since it was just barely east of the meridian flip point. I have
attached the ACP log of this run.

This has happened to me 3 times in the past month so it is not a one-time fluke.

I am running ACP V6.0 Hot Fix 1 and AstroPhysics_V2_Setup_5.00.04-Beta15 for the AP1200 driver.

Any ideas or things to try would be greatly appreciated.

Larry Owings