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CP4 vs CP2 motor stalls?
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Tom Blahovici
Hi
I frequently image during cold temperatures with my AP600. A few months ago I updated to a CP4 from a CP2. Two days ago, the temperature was -12C and I received two motor stalls during slewing. In the past I could work at -25C and never got motor stalls. I have low temperature grease in the mount as per APs recommendations. Is there away I can minimize this occurance? Thanks.
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michaeljhanson@...
Hi Tom,
There are several things you can look at: - Do you know what version of CP4 software you have? There have been a few changes related to stall over the years. - Are you using the same power source as you did with the CP2? And, is that power source adjustable? It is possible that a little higher input voltage will help the system to maintain the slew speed. - Is the CP4 slewing at the same rate as the CP2? The slew rate can be reduced to reduce stall occurrences at a given input voltage. - Gear mesh can have a dramatic affect on the motor loading, make sure it's not too tight. See 600EGTO - Adjustments to Remove Worm Gear Backlash, at https://astro-physics.info/index.htm?tech_support/tech_support_legacy. It also discussed mesh. Regards, Mike Hanson
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There are some safety limits in the CP4 that could have a bug in some firmware revs that look like a motor stall but aren't. Make sure to be using the latest firmware rev.
On Thu, Dec 17, 2020, 5:52 AM <michaeljhanson@...> wrote: Hi Tom,
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Tom Blahovici
All firmware is up to date and all power supplies etc are the same as previously with my CP2. I will lower the slewing speed which I think is at 600.
Thanks, Tom
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