Wiring Limit & Home Switch

[Hood]

Do you have a Z Home switch? If yes then you wont be screwing about with Homing without Home switches
If you dont then the axis will not move when you do a RefAll.
Not read the doc but if you want to home without switches you need to manually move the axis to a known position before you press the Ref All.
Hood

[kolias]

Sorry Hood, my mistake

I do have two limit switches on the Z axis but they both share the same pin number on the BOB and so I cant consider one of them as a Home switch

Thank you

[Hood]

You can use one as a home switch Just set the Z home to same port and pin as the Z Limits use.
Hood

[Tweakie.CNC]

You can use your limit switch as a home switch because when set-up the axis will only home in the one direction.

Tweakie.

(In answer to your earlier question re soft limits - the axis would home to the 0.25" position because that is the figure Rich specified in his setup).

[kolias]

You can use one as a home switch Just set the Z home to same port and pin as the Z Limits use.
Hood

 I did this but the axis moves in the plus direction when I hit the Home button. I switched on the Active Low but then I get a message that one limit is one and I have to press reset

The keyboard arrows move the axis correctly.

How can I get the axis to Home in the negative direction?

[Hood]

The Z should move in the positive direction when you home, ie up the way. Homing down the way is not a good thing to do as it would cause problems with the spindle fouling clamps. work pieces or even the table.
Hood

[kolias]

The Y and Z axis are Homing ok now but the X axis was Homing in the wrong direction

So I went to the Motor Home/Soft Limits and un ticked the Home Negative like the Z axis

I wonder why the X axis was Homing in the wrong direction

Also on the same screen I have set the Slow Zone to 2.00 and the Speed % to 20. I understand that the Slow Zone means when the axis approaches the 2.00 the speed will be reduced to 20% until she hits Home. But this does not happen, no matter where the axes are when I Ref Home they start moving to Home at the 20% speed. What I do wrong?

[ger21]

Slow zone is for soft limits, not homing.