Hi, A few years ago I bought this set:
CNC Bauteile -- 5 Achsen Interface + 4 X Einzel-Schrittmotor-Steuerung M542H | eBay
I'm just now getting to set up a portal mill and am having odd problems with it. If I hook up limit switches I can't get Mach3 to reset to allow the steppers to move. Mach3 says "external E-Stop activated". I have checked the wiring about 50 times and replaced all cables with one shielded cable per limit switch. This goes for the e-stop as well. If I disconnect the limit switches it will work for a few seconds to a minute and then stop again. In the diagnostics screen, there is no indication that the e-stop was activated. Running G-code has no effect. Configuring Mach3 to run without e-stop and disconnecting the cable seems to extend the amount of time before it shows up again.
Normally I would guess RF-noise but I have everthing in a grounded metal housing and all cables are shielded so I don't see how that's possible.
If anyone has experience with this set or can make a suggestion what to check next I would very much appreciate it.
Thanks