Homing

[mr-ben]

I have masso input pins 1,2,3 configured as input homing. The X and Y work ok, hitting the sw and pull back. The Z, which is last, hits the sw, stops, and gives a hard limit alarm. I can't clear the alarm without rebooting.

Any ideas? I've checked configuration and looks same as X and Y.

Ben

 

[masso-support]

whats your homing feedrate? have you tried reducing the homing feedrate?

Also please check that your Z axis homing input in F1 screen only shows H when the switch is pressed, else select the input and press space key to invert it. If the Input shows H when the switch is not pressed then you will have issues with homing.

 

[mr-ben]

Hi,

I have tried several feed rates, from 500MM/M to 100MM/M. If I watch F1 during homing, I see L during homing, and that goes H when it hits the sw. Should I try another input? Where does the hard limit alarm come from? When the Z axis hits the sw and the status light goes H, why does it say hard limit alarm AND blink the homing sw? Why both? How do you set a HARD LIMIT?

Ben

Also, you might want to check your wire NUMBERS for step and direction for clear path servos.

 

[masso-support]

Have you tried to disable hard limits in F1-Setup under General Settings? does homing works fine after disabling hard limits?

Regarding the clearpath did you find anything wrong with the numbers?

 

[masso-support]

@mr-ben I was just discussing the issue and am told that there has been a bug found regarding hard limits, can you please let us know your controller serial number and will email you the test software.

 

[mr-ben]

I tried disabling hard limits and all it did was clear the alarm, Z still stops after hitting the sw, status goes H. Low feed rate makes no difference.

About the servos: I had to use 2 and 6 for step and 3 and 7 for direction. I believe your docs say 3 and 7 for step and 2 and 6 for direction.

I'm going to load 3.35 and see if that helps.

Thanks for the support, we will get this solved.

Ben

 

[masso-support]

yes you are right @mr-ben, after checking we found that the numbers are swapped, thank you so much for pointing the issue and we have now updated the web page with a new wiring example.

 

[mr-ben]

I found my homing problem, I had entered wrong values for min and max travel. Rookie mistake! All OK now. Thanks for your help.

Ben

 

[masso-support]

great stuff, thank you for letting us know.

 

[lordy]

Hi I'm running V3.36 and having the same issue as above. I have tried everything listed in the posts but my Z axis is still hitting the limit switch and not backing off, then giving a Z hard limit alarm?

 

[mr-ben]

Lordy...

Here is what I did to clear the same problem: Go to F1, and set Z max travel to 0.000mm, set Z min travel to -200.000mm ( or what ever your Z travel is).

Worked for me.

Ben

 

[masso-support]

@lordy whats your Z min and max travel values?

 

[lordy]

Hi,

I think Mr Ben has highlighted the problem I put the Z maximum value as a positive (but it is homing at the top of the axis) rookie mistake, I have not tried it yet but I think that is the problem.



Thanks All.

 

[masso-support]

@lordy please let us know how you go, thanks