Re: E-stop relay welds contacts for load dump resistor

The E-stop circuit is, at the very least, energized when the machine is powered up for a working session, and dumped when the machine is shut down at the end of the evening (home hobby workshop). Under normal circumstances, yes, it is not activated frequently. As I finish configuring this machine, I may have to go into E-stop three or four times on a Saturday to unplug motors for troubleshooting, or to make adjustments on things. Have you seen any sample schematics, or do you have any methods for safely de-energizing the drives and power supply by not passing power through the load dump resistor? I have worked with many other industrial machines in the past where engaging E-stop is a required part of lockout/tagout procedures, and is never considered an extraordinary, or "disaster only" event that risks causing damage. Large production machines like printing presses running at high speed are excepted, of course. We only E-stop them to "safe" the machine when idle. Thanks,

Dan.

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--- In CAD_CAM_EDM_DRO@yahoogroups.com, David Speck <Dave@...> wrote:

>
> I'm a little puzzled about the whole issue. The dump circuit should
> really be reserved for rare emergency situations, not for routine
> shutdown operations. Perhaps there is a bit of a learning curve being
> addressed?
>
> Dave
>