Re: Mach1 and GTOCP4 Yellow Light
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There is also some mysterious limits function in the CP4 that I have encountered in the past that I don't yet fully understand when using the CP4 and just the hand controller. It might manifest in other control scenarios as well. Basically, one day my Mach1 with CP4 wouldn't slew very far to the East (or West. I forget.) before the power light would go yellow and not let me slew farther. This was on a solid 13.6V 10A power supply. No hanging cables or other mechanical snags or problems. Cycling CP4 power got the red light back but as soon as I would try to slew into the "forbidden zone" the light would go yellow again. The mount was finding things in the sky everywhere else just fine and time/date/location/TZ info in the hand controller all looked fine. I tried a couple of "resume from Park X" procedures and suddenly the problem vanished and I could not duplicate it. I suspect that some safety limit variable was out of sync in the CP4, but I was unable to reproduce the problem to study it.
It has resurfaced about every other month or so on my Mach1/CP4 and the solution seems to be to do one or more CP4 power cycles and "Resume from Park X" procedures to get whatever variables inside the CP4 that are managing safety slews resynchronized with the rest of the CP4 code.
I shared this info with the AP CP4 programmer but I didn't hear back if he was able to reproduce the problem and/or get it figured out and fixed.
And of course there is always the chance that somehow I was unknowingly causing the problem and there isn't a mystery horizon limit bug in the current CP4 code.
I hope this helps.