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Heatbed Stuck on After PID Autotune

Posted by xelad

xelad

Heatbed Stuck on After PID Autotune
July 30, 2015 08:58AM

Registered: 11 years ago
Posts: 58

Hi all,

I've built a printer and used a Ramps 1.4 Adruino MEGA 2560. All was going well, i installed a heated bed, it took a couple of minutes to get up to temp, so i did PID autotune, since running the autotune the bed is stuck constantly on, the ramps smells burnt when on, and the LED for the bed is constantly on.

Is the board fried?

Thanks

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o_lampe

Re: Heatbed Stuck on After PID Autotune
August 01, 2015 03:48AM

Registered: 11 years ago
Posts: 5,232

Some cheap Ramps clones use bad screw terminals for the PSU and the extruder/bed cables.
If you happen to have a weak 5V regulator on the arduino, you can also get very hot MOSFet´s. Measure the 5V rail on your endstop-connectors. Is it lower than 4.8V?
I´ve seen, that a hot MOSFet touching the screw terminal, made it smell and smoke!

Make sure, your connectors don´t melt! They can cause shortcuts.
-Olaf

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xelad

Re: Heatbed Stuck on After PID Autotune
August 03, 2015 08:01AM

Registered: 11 years ago
Posts: 58

I think i broke the ramps, as my printer was set to use bang-bang, but i tried to PID autotune on bang bang. So i think this is why the MOSFET is stuck on.

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tadawson

Re: Heatbed Stuck on After PID Autotune
August 03, 2015 12:04PM

Registered: 11 years ago
Posts: 606

There really isn't anything involved other than the MOSFET. Replace it and keep moving forward . . . no need to trash the board for a component failure . . .

- Tim