Hello
I guess my problem is of the same nature. My mount ASA DDM60pro (serial no. 10110, production year 2012) makes the mistake on RA axis while using at low temperatures. The lower the temperature the more faulty exposures. Worst effects are observed in temperatures below freezing. In fact I am unable to take any pictures in such weather conditions. I can feel greater resistance on the bearing then. On the other hand, during spring while the air temperature exceeds 8 degrees Celsius, mount works without any disruptions.
My two colleagues from Poland have experienced exactly the same issues and it appears the production dates of their mounts are the same as mine.
I have performed two tests on my mount DDM60pro. First took place on 15th April 2015 and night temperature was 12 °C then. I haven’t observed any issues during taking photos. I did second test on 21st April 2015 and temperature was lower on that day: 6 °C. I noticed two exposures with errors:
1st exposure 600s, dated 21-04-2015, time: 23:09:51
2nd exposure 600s, dated 22-04-2015, time: 00:23:49
Below you can find photos taken on the same day during bad exposures at 600s as well as CIServoLogs file. For clarity I am providing a selection of CIServolog lines where tracking errors have occurred.
-23:01:28 error 2.41 arcsec 7.3A
-23:01:40 error 2.87 arcsec 5.0 A
-23:01:46 error 21.85 arcsec 5.0 A
-23:01:58 error 21.42 arcsec 5.0 A
-23:02:04 error 84.91 arcsec 5.0 A, end of exposure 1 - 23:09:51
-00:15:11 error 1.77 arcsec 6.2 A
-00:15:28 error 2.13 arcsec 3.8 A
-00:15:40 error 2.71 arcsec 4.9 A
-00:15:47 error 10.27 arcsec 5.0 A, end of exposure 2 - 00:23:49.
Best Regards
Andrzej
2015_4_21_20h58m (5).txt