Z AXIS BLOCKED in one direction

[Pierfrancesco]

Hello! I finished to build my Geeetech Prusa I3 B Acrylic and started the main configuration of the printer. All components works fine except the Z Axis that move in only one direction. I will try to explain better the problem...

Using Repetier when I try to set home position all axis bumps endstops and stops, this is not the same for the Z axis, that hit the endstop and push it for other 8-9mm. Also If I try to move the Z axis UP it cointinues to move DOWN, this happen after and before the home position calibration.

I checked several things: Motor Driver (0,8), ENDSTOP Plug and connection (It works fine, in fact when the extruder support bump the endstop I can see the codec of ENDSTOP OPEN/TRIGGERED on the software). I tried also to invert motor sense of turn, and they go, at the same way, UP without the possibility do go DOWN.

I can't understand what are other possible causes of this problem... I don't know If it's the software... I tried Repetier 1.6.0 and 1.6.2 and nothing changed. Help me please!

[William]

Hi,
Read your post carefully,i think it's still more likely the connection of Z axis endstop has a problem:
1.You should double check on the two ends of Z endstop wiring(to the board and to the endstop itself),make sure the two ends all have a good connection.
2.If &1 still doesn't fix it,you can swap the connector with other endstops to check if the Z endstop is broken or the Z-min slot on the board is not working.

[Pierfrancesco]

Thank you for reply... I think that end stop work well bacause Repetier could show me if it is closed or open... It's like the inversion of motor rotation doesn't exist. What about windows 7 drivers?

[Pierfrancesco]

Thank you for the reply... I think that isn't the endstop the problem, that because on repetier appear when Z endstop is triggered or open and that could means that it is working. What do you think about win7 driver? Could be this the problem?

[William]

The Win7 driver?What exactly do you mean?The driver is just for detecting by computer.
Sounds wierd,you said Repetier shows triggered when Z axis touched it?Generally Z axis moves in one direction i encountered is caused by the endstop.Could you attach a video about the "trigered"?
Anyway,maybe you can have a try on the solutions i proposed.
If it doesn't fix it indeed,you can reflash the firmware to have a try.

[Pierfrancesco]

https://www.youtube.com/watch?v=Iji5Pp1OiFU In this video I try to explain better my problem...

[Toy]

First you need to make sure z axis is installed well, the rods can move smoothly when you move it by hand.
You can release the motors from z axis, then activate the motor in repetier, see how it rotates,
you can check if it's the problem of motor, the driver or the motor wire according to the link:
http://www.geeetech.com/forum/viewtopic ... 17&t=17038

[Pierfrancesco]

All wires are right, and motors are well because they run, but only in one direction. The electronic part is right, I tried to change some parameters on the firmware and it seems like there is a block with the rising movement of z Axis.

[William]

All wires are right, and motors are well because they run, but only in one direction. The electronic part is right, I tried to change some parameters on the firmware and it seems like there is a block with the rising movement of z Axis.

1.Have you tried removing the rods from Z motors and see how it goes?
2.You can swap the driver for Z axis to see if there is a difference.

[Pierfrancesco]

If I remove the rods, motors run at the same way in one direction. With another driver nothing happen... It's the same thing