AM5 Erratic Guiding

AdrianW

I had a similar problem with my guiding but it manifested itself the closer the scope got to the meridian.
I made a few changes all at the same time and it came good. I haven't bothered to go through them one by one to see which fixed the problem but some may apply to you.
The main expenditure was on a 50mm Skywatcher ED guide scope. I had a little 30mm and I had lost confidence in it.

ZWO almost certainly designed the ASIAIR to work with their own gear so I'm pretty certain that the default calibrations for guiding were set because they give optimum performance so put them back to 2000ms.
You say you changed to a 5A power supply. If you purchased the ZWO power supply and have a pier extension the cable is short enough for the weight of the power supply to be hanging off the mount at some point. That could effect guiding.
I have my 10A Li-ion battery on the 5A socket of the mount and run the AIR off the 3A socket on the side of the mount. Since my ASI 294MM is the only other 12V powered device, it is fed from the AIR 12V output.
The EAF runs off one of the AIR USB ports and the filter wheel and guide camera are connected to the USB hub on the camera because when they are pulling 5V power off the USB port the camera isn't.
You should also have a think about getting some better quality cables and make sure your cable management is spot on. You've been playing around with the setup a bit and one of your cables may have developed a fault.
You should also have a look at the USB jacks on the ASIAIR because I've read that there is a fault that develops where the USB jack connects to the AIR.

Kevin_A

AdrianW unfortunately Asiair was designed well before ZWO sold any harmonic mounts of their own. The 2000ms max durations were a standard setting derived from phd2 guiding parameters based off of typical 2s guide exposure lengths for worm driven mounts and not at all for faster harmonic mounts. When a harmonic mount guides with 0.5s to 1s exposures there is no point having a 2000ms max duration and after a dither it can actually result in wild oscillations in certain mounts to which has been documented and discussed. As long as your max durations are equal or a bit less than the guide exposure length then that is the correct range for any mount.

AdrianW

Kevin_A. The point being that when they started selling their own mount they remained the default settings.
ZWO has a good record of making their equipment work well and I don't think they would set default settings that they hadn't determined to be optimal.

Kevin_A

AdrianW unfortunately that does not apply to harmonic mounts. They are fairly new to that product line. The settings are ideal perfect standard settings for worm driven mounts to which was 99% of the market at the time they introduced asiair and still is 90% of mounts used with asiair. They still will use these standard settings as they want to keep it simple. If you know a lot about strain wave gears you would understand why the standard settings they use for durations are not ideal for the AM5. I asked zwo why they do not use seperate data for their mounts and they said they want to keep simple standard settings and have told individual users to reduce max durations down to 1000ms with AM5 mounts in quite a few posts. Cheers!

Kevin_A

AdrianW the main thing to remember about SWG mounts is that non are the same and you cannot use the same settings for all that work great for others so it is up to users to learn about their own mounts and what works best for them. 3 years ago 99% of PHD2 users used 2000/2500/2500 as standard settings with worm gear mounts and they still do so today. The only one that changes is the calibration step size setting ms that is based on guide scope FL and guide camera pixel size. I know a few people that standard settings with the AM5 works fine and many that reduced the numbers dramatically to get much better results.

SFG8UeX8

Problem Solved. I'm embararessed to say it because i have spent litterally 2 weeks trying to figure what the problem was.
The camera rotator( i think thats what its called) was loose. It has one thumb screw that if you loosen it will allow you to rtotaTE

Kevin_A

SFG8UeX8 haha… things like that happen to us all… it’s like imaging for hours with a bahtinov mask still on. Glad it is fixed! Good luck!

ASIMount@ZWO

SFG8UeX8 Happy to know your trouble was gone.

MrAstro

SFG8UeX8 Happy for you,
Last year, As soon as I received the AM5, I checked all visible screws and found 2 were loose, They are on top of the saddle plate as I recalled.
Since then, I rechecked all screws in 6 months routine.
Temperature changes+ transportation.. etc. are likely affect the screws.

SFG8UeX8

Thanks guys for your help!

ASIMount@ZWO

MrAstro Thank you for your feedback. We'll pay attention this potential risk during our manufacture, storage and transportation process. We'll get better with your help and support.