Power supply on PC marginal?
Sent from my Galaxy -------- Original message -------- From: Peter Wallace <[email protected]> Date: 2026-08-10 10:10 a.m. (GMT-08:00) To: "Enhanced Machine Controller (EMC)" <[email protected]> Subject: Re: [Emc-users] PC restarts when pwmgen value is non-zero On Mon, 10 Aug 2026, Viesturs L?cis wrote: > Hello! > > So I am now at customer's premises, I have mounted PC inside control > cabinet, wired basic safety loops and connected servodrives to 7i33 > board - analog outputs and encoder inputs. Encoder inputs seem to work > - rawcounts value is changing nicely if I push the machine around. > So I wanted to try to move some motors from LinuxCNC. There are total > of 4 servodrives and one of them is toolchanger carousel - I wanted to > start with that because it will cause no damage with its motion. > I usually start with setting pwmgen value with vcp slider so that I > can check if there is any analog voltage on output and if the drive is > actually moving the motor. > The end result just does not make sense to me. Long story short - with > machine power still disabled, LinuxCNC enabled and giving any pwmgen > (I tested with 2 out of 4) nonzero value, PC restarts in seconds. > I thought that my wiring is bad, but it happens even if I unplug all > cables from 6i24 board: > https://photos.app.goo.gl/882aHXWcDAYcLsf29 > > Another of previous attempts that was filmed: nonzero value for pwmgen > is fine, if it is disabled. PC restarts in 3 seconds, when pwmgens are > enabled and value goes from zero to nonzero: > https://photos.app.goo.gl/bFTSQout66WjaUXh7 > > First attempt that I filmed - long video, starts with powering the > machine on. PC restarts almost immediately as I change pwmgen value > > As I am preparing and writing this email, PC is turned on, LInuxCNC > enabled, all pwmgen values are zero, for 26 minutes now. > > This is what happened when I changed the slider value: > https://photos.app.goo.gl/hYYmEBvZNdHPvpRg6 > > Does anyone have any idea what is going on? This is the first time I > am seeing something like this. > > Viesturs > Very strange What LinuxCNC verion? > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
