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Prusa i3 - Home to endstops and now get no movement

Posted by Booda 
Prusa i3 - Home to endstops and now get no movement
January 12, 2018 08:24AM
Folgertech Prusa i3
Marlin firmware -see attached config.h

When I hookup printer i am able to move axis and have them setup so moving correctly.
Endstops:

X / Y - optical
Z - mechanical

Y axis - Back right
x axis - right side
z axis - right side

All hooked up to min on ramps (had guy setup for me and left configured that way)

Issue:

I home all axis, even if just move axis to and endstop it becomes 'triggerred' like it's supposed to. However I'm unable to move any of the axis off the endstop once it has been triggered.

Any help would be greatly appreciated.
Thanks.
Attachments:
open | download - Configuration.h (16 KB)
Re: Prusa i3 - Home to endstops and now get no movement
January 12, 2018 08:39AM
The homing position is wrong. You'd have to define X-axis as max. endstop or move it to the left of the printer.
Re: Prusa i3 - Home to endstops and now get no movement
January 12, 2018 10:53AM
Ok thank you I will probably change sides of x axis.

Is it ok run all 3 axis on min or should 1 be on max?

Will try it out this afternoon when can get time work on it.
Re: Prusa i3 - Home to endstops and now get no movement
January 12, 2018 06:25PM
any combination of min and max is valid, as long as thats what you have in hardware and you tell the firmware
Re: Prusa i3 - Home to endstops and now get no movement
January 13, 2018 01:00PM
Perfect thank you.

Work on it tomorrow hopefully get it figured out.
Re: Prusa i3 - Home to endstops and now get no movement
January 15, 2018 08:21AM
So I had changed my x axis and while I was homing my z axis lcd went blank.

Now - No longer have 12v power. Lcd will come one once I have 5v from usb though. I am able to move axis, but when endstop on z axis is hit lcd went blank again.

Possibly bad endstop, would it have fried ramps board if no 12v power?

ugh. This printer been nightmare since bought it but determined to get working (again).
Re: Prusa i3 - Home to endstops and now get no movement
January 15, 2018 03:24PM
If your endstop is plugged in backwards to that it shorts +5v to gnd this will stop everything and often kills the 5v voltage regulator on the mega
Re: Prusa i3 - Home to endstops and now get no movement
January 16, 2018 03:43PM
I only have 5v power now. I plug in 12v and no display or anything until I plug in 5v usb power.

Busy with work so not alot time work on it right now. Think time to take apart and go through step by step again.

Have spare ramps and mega. I'll redo everything hopefully in next week.
Re: Prusa i3 - Home to endstops and now get no movement
January 16, 2018 09:11PM
Yip, thats a dead voltage regulator on the mega

The power comes into the ramps 12v 5amp circuit. This goes threw the 5amp fuse threw D1 and into the vin pin on the mega

The mega can take power 3 ways. the dc jack and the vin line are the same, they go to the voltage regulator which turns 12v into 5v.
The 3rd way its to take 5v from the usb cable..

If the regulator is broken it still work with usb applied. (ie what you have)
Re: Prusa i3 - Home to endstops and now get no movement
January 16, 2018 09:11PM
Double post removed.

Edited 1 time(s). Last edit at 01/16/2018 09:15PM by Dust.
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