[The Wizard]

Hi Folks,

I just upgraded my system due to a low speed/feed problem I discovered after I finished building the CNC router. I now have a Hobby CNC board and 200 oz. motors with a 35V power supply. I have also wired up my home/limit and e-stop switches this time but I am having problems getting things set up in TCNC V4.01. Can someone give me some pointers as to where I have gone wrong. I can spin the motors if I go into the jog screen and toggle the limits to 'off' (and I get good speeds) but with the limits toggled to 'on' I get no movement in 'jog' and no movement if I use the MDI screen. The 'Status Window' says 'Stopped' at the top and any attempt to move under the MDI screen says 'A limit switch is active'. When I hit the e-stop I get no indication on the screen that the e-stop has been hit but thankfully I have the e-stop wired through a relay that turns off all power to the board so the motors do stop as they should. I have tried toggling the 'active high/low' settings and toggling the limits to 'enabled/disabled' but it makes no difference to the operation. I also have the 'Use home as limit' option checked too. I have been making sure I reset the ports after making any changes.

This is my hardware set up:

Three limit switches wired NC in series connected to pin 13.

Three home switches wired NO to individual pins as follows:

X home - pin 10
Y home - pin 11
Z home - pin 12

E-stop wired NO to pin 15

This is my software set up:

Use home as limits - active
E-stop - enabled - pin 15 - active low
Limit switch - enabled - pin 13 - active low
X home - enabled - pin 10 - active low
Y home - enabled - pin 11 - active low
Z home - enabled - pin 12 - active low

It would appear that for some reason TCNC is seeing a tripped limit somewhere but for the life of me I can't figure out where and changing parameters seems to make no difference. I have checked the physical pin wiring and the switches themselves to make sure those are ok and they all check out as fine.

Any help/pointers greatly appreciated.

Larry