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Thread: Auto bed leveling servo hookup
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01-16-2016, 09:34 PM #1
- Join Date
- Oct 2014
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- 134
Auto bed leveling servo hookup
I have been following Zenmasters instructions for setting up auto bed leveling. I jumpered the two pins on the ramps board as he said to do. Immediately after doing so my lcd dims and I lose the USB connection to the board. Remove the jumper and everything works normally. Any ideas of what may be wrong?
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01-17-2016, 09:54 AM #2
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- Dec 2015
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- 24
Your servo is pulling too much power. When I hooked up ABL, everything *worked* but the servo jiggled constantly when printing as power fluctuated to the steppers. I pulled the jumper and ran 5V from my ATX PSU direct to the servo power pin (the middle one in the group you jumpered) and the problem went away.
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01-17-2016, 01:23 PM #3
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- Jan 2016
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- 4
for the servo jiggling during moves you can activate #define PROBE_SERVO_DEACTIVATION_DELAY in config.h - this will disable it unless needed. default is 300 - I found 400 to work best with a tower pro 9g servo. depending on the speed you may have to increase the delay; If the servo doesn't complete it's moves increase it and vice versa
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01-17-2016, 03:45 PM #4
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- Dec 2015
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- 24
Defining that improved things, but it didn't go away 100% until I changed the 5V supply to the PSU.
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01-17-2016, 04:29 PM #5
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- Jan 2016
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- 4
interesting. I'm using an LED power supply so I only have +12vdc but I'm sure I have a spare 5vdc supply somewhere around here. I'll give it direct power a shot.
If I use external servo power will deactivation delay will do nothing? I assume it works by cutting +5v to the servo x milliseconds after a command is given.
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01-17-2016, 05:18 PM #6
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01-17-2016, 05:23 PM #7
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- Jan 2016
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- 4
interesting. thanks! to be clear my servo works fine but before I enabled deactivation I was getting a lot of jerking. wondering if external 5v power would make things a bit more reliable and consistent
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01-18-2016, 08:06 AM #8
Another thing you can do is change the angles +/- 1 or 2. Certain positions are more sensitive to twitching than other positions.
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