Slew settle time or bad PID?

[Corpze]

Hi, feels like i am spamming this community, but as a total newbee on ASA's mounts, i hope you understand

 

I have come so far that i was able to perform a auto point with 20 stars yesterday, together with my C9,25" SCT.

At first, i had a slew settle time of about 2sec, wasn't good enough so i raised it to 5 and later on 7 seconds.

How ever, when pointing east, south or west I am getting pretty good stars for the 5sec exp. pinpoint needs. But when i am pointing north-ish at mid to low declinations, the 7sec is not at all near enough in settle time OR is it the servo PID-settings that might be different in this direction, making star trails? 

 

This resulted in just two successful solved images.

 

How long slew settle time do you guys have?

 

/Daniel

 

[lukepower]

Hi Daniel,

 

I would (sorry for saying this again) first check carefully the balancing in all positions - especially in those you say you had poor tracking and long settle times.

This of course has also to do with the PID values, however in a prefectly balanced system - and no wind - the PIDs should be fine no matter which position you have. Anyhow, you could also try to slew to the bad positions and try to perfect your PID values there - at least that's what I'd try first.

 

Good luck

Lukas

[Corpze]

Will doublecheck that again, my first thought was bad mounting (vixen dovetail) and a sloppy mirror, in conjunction with to short slew settle, but i will take a closer look at the PID when facing around 30deg N and 35Deg Dec...

 

/Daniel

[lukepower]

Have a look at the diagram Autoslew makes when tuning the PID manually. If the values there are quickly stable, you should be fine. If, afterwards, you still have trouble then it might something mechanical in your OTA...