<div dir="ltr"><div dir="ltr">On Wed, Jan 9, 2019 at 8:00 PM Andrew Kohlsmith (mailing lists account) <<a href="mailto:aklists@mixdown.ca">aklists@mixdown.ca</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Unless you’ve got a real reason to suspect poor or intermittent connectivity I would look more at the steppers and mechanicals needing more current due to stiffening and low temperature.<br></blockquote><div><br></div><div>The reason I suspect bad connections is that I changed the controller to a backup</div><div>board that I have. Same result. Then other RJ45 cables. Same result. <br></div><div><br></div><div>The following day, I wrote a program to stress test the telescope and move it from <br></div><div>extreme position to the other extreme position repeatedly, for more than hour, <br></div><div>and this was indoors: things worked well.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
What is the current carrying capacity of the power supply? </blockquote><div><br></div><div>It is rated for 2A, and seems to work fine indoors.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Can you swap out a more powerful (higher current) power supply easily? </blockquote><div><br></div><div>I have one that is 5A, but it is very bulky (looks like a PC power supply, with</div><div>long cables going in and out, with a car 12V plug). Will try that one.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">What about the stepper drivers, are they marginally sized and higher current required for stepping in cold temperatures is causing them to fault?<br></blockquote><div><br></div><div>They are tiny. NEMA 11 instead of the usual NEMA 17. But they have an 18:1 <br></div><div>gearhead which gives them enough torque, and there are others who are using</div><div>the same model of motors without issues (not in sub zero temperatures though).<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
I have a number of RJ45 connections in outdoor settings and unless the connectors themselves are poorly made or of poor quality, I would not suspect them contracting and breaking contact.<br></blockquote><div><br></div><div>I did buy the flat RJ45 cables and the sockets, from eBay, so they may not be the best <br></div><div>out there. But they are the flat ones, which are the most flexible. <br></div><div><br></div></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div>Khalid M. Baheyeldin<br><a href="http://2bits.com" target="_blank">2bits.com</a>, Inc.<br>Fast Reliable Drupal<br>Drupal optimization, development, customization and consulting.<br>Simplicity is prerequisite for reliability. -- Edsger W.Dijkstra<br>Simplicity is the ultimate sophistication. -- anonymous<br><br></div></div></div></div>