**RESOLVED** - limit switches - unclear

[yolk]

hi
i tried the manual - read all the post on this topic in the forum and tried 34 versions on the machine. nothing works.

okay here's the machine: i have 3 limit switches i'd like to use as home switches. (on the other end of the axis i'd like to use soft-switches)

i read axis movements are not defined by the table movement, but the tool movement. (so i reversed some axis in the settings)
so when i push
-x the table moves to the right (the tool to the left)
-y the table moves to the back (the tool to the front)
+z the head moves up - so does the tool

this looks correct to me - right?

to reach the limit switches i have to move
-x: table totally to the right
-y: table totally to the back
+z: head completely up

hence i wired the limit switches to:
-x
-y
+z

jumper settings
you write: Using the Limit DIP Switches, a limit switch is defeated by setting the appropriate switch to
the UP position. Setting the switch to the DOWN position, enables the limit switch and will
prevent motor motion when the input is open.

so i pushed all jumpers up to defeat them
then pushed down:
-x
-y
+z

now no matter what i type in the settings, nothing works. the best i get is that the motors stop but don' travel back to free the limit switch (so they seem to trigger at least something )

did i make a mistake with the wiring, the jumpers or the settings? (the settings in this photo are completely wrong)

thanx in advance
david

[cncsnw]

It depends on the direction reversal setting for each axis.

Because you have direction reversed on X, your logical X- limit needs to be the internal/electronic X+ limit (that is, INP2).

You should enter "2" for the X- limit number, wire the switch to INP2, and close the defeater switch for INP1 (the internal/electronic X- limit).

Y looks correct. Because Y is not reversed, the logical Y- limit and the internal Y- limit are the same, INP3. You should wire the switch to INP3, and close the defeater switch for INP4 (the internal/electronic Y+ limit).

Z looks correct. Because you have direction reversed on Z, your logical Z+ limit should be the internal/electronic Z- limit, INP5. You should wire the switch to INP5, and close the defeater switch for INP6 (the internal/electronic Z+ limit).

Finally, you need to enter the same numbers in the "Home" columns that you entered in the "Limit" columns: X- = 2, Y- = 3, Z+ = 5.

[yolk]

see below

[yolk]

see below

[cncsnw]

When you try to jog X-, does it say "407 X- limit (#2) tripped", or does it say "411 X axis (#1) full power w/o motion"?

If it says "limit tripped", then your switch circuit is open. Use the PLC diagnostic display (alt-i at the main screen) to see whether the first six inputs are all closed (green) when no switches are tripped.

If it says "full power w/o motion" then your direction reversal choice and defeater switch settings are probably wrong.

[yolk]

see below

[yolk]

see below

[yolk]

here again what i did in pictures:

jumpers +x -y -z down, all the rest up

x limiter to input 2
y limiter to input 3
z limiter to input 5



and my settings:

[yolk]

okay - i powered the system down. disconnected it from the power source.


when handcranking.. +X moves easily but for -X i have to crank harder

then disconnected the shield and + and - power from the board . now i can hand crank in both direction easily

[yolk]

found the culprit - blew the -X mosfet (or at least it looks like a mosfet)
had a similar problem on my other cnc once.


can i buy these separate or do i have to send in the board?

best
david