<![CDATA[SoliForum - 3D Printing Community — Drivers too hot]]> https://www.soliforum.com/topic/12682/drivers-too-hot/ Thu, 29 Oct 2015 04:41:52 +0000 PunBB <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108492/#p108492 carl_m1968 wrote:

Normally clockwise does not increase. I use DRV88's as well and I can assure that counter is lower. What might have happened is that they where at max. These pots do not have a stop so you can turn them past max and back to minimum by turning the same direction too far.

In a nutshell ^that

]]> Thu, 29 Oct 2015 04:41:52 +0000 https://www.soliforum.com/post/108492/#p108492 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108486/#p108486 Normally clockwise does not increase. I use DRV88's as well and I can assure that counter is lower. What might have happened is that they where at max. These pots do not have a stop so you can turn them past max and back to minimum by turning the same direction too far.

]]> Thu, 29 Oct 2015 01:57:14 +0000 https://www.soliforum.com/post/108486/#p108486 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108484/#p108484 ***UPDATE:

Somebody please tell me that its not an easy thing to know or i might cry. I turned the pots CLOCKWISE this time. It seems thats the direction to lower the value. Why didn't I know this? Thanks all for the replies.

]]> Thu, 29 Oct 2015 01:37:17 +0000 https://www.soliforum.com/post/108484/#p108484 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108483/#p108483 carl_m1968 wrote:

My guess is you fried the DRV88 even though that is near impossible for those chips as they can handle 2+ amps if heat sinked. But I would first buy new drivers. You could also have bad motors now as well. When things get too hat bad things happen.

Neither the drivers or motors are fried. I can switch all the boards around and they all function fine. I can also plug different motors into different drivers and they all run. So it's not a problem there. The DRV8825's have only an hour or so of run time(which i know doesn't excuse them from being fried, just saying).

]]> Thu, 29 Oct 2015 01:15:24 +0000 https://www.soliforum.com/post/108483/#p108483 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108481/#p108481 My guess is you fried the DRV88 even though that is near impossible for those chips as they can handle 2+ amps if heat sinked. But I would first buy new drivers. You could also have bad motors now as well. When things get too hat bad things happen.

]]> Thu, 29 Oct 2015 01:13:11 +0000 https://www.soliforum.com/post/108481/#p108481 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108482/#p108482 wardjr wrote:

They will get too hot with too low of current just as too high.

I didn't know that! I guess I'll get the multi-meter out and actually set it correctly. We'll see if that helps. As soon as i get printing again I'll make some fan mounts.

Does anyone bother cooling their motors too?

]]> Thu, 29 Oct 2015 01:13:11 +0000 https://www.soliforum.com/post/108482/#p108482 <![CDATA[Re: Drivers too hot]]> https://www.soliforum.com/post/108472/#p108472 They will get too hot with too low of current just as too high.  Turn them up slightly and no matter what get a fan blowing on them.  Don't forget that drivers fail and excess heat will decrease their lives.

]]> Thu, 29 Oct 2015 00:48:19 +0000 https://www.soliforum.com/post/108472/#p108472 <![CDATA[Drivers too hot]]> https://www.soliforum.com/post/108470/#p108470 Hey guys. Been having a lot of problems with my printer lately. I thought I had them all fixed but things are actually getting worse. I'm using a Prusa i3, ramps 1.4 and drv8825's on all my drivers.

During a print my x motor shut off and the y motor continued. I attested this failure to a thermal shutdown on the drivers. They got extremely hot and so did my motors.

So naturally, i turned the vrefs down today. I didn't use the measurement way but i turned them down until the motors wouldn't run then turned them up a little bit. Now the drivers and motors are getting hotter quicker so much that i cant run the x motor more than 50mm without a shutdown(i'm still thinking thermal shutdown because once it rests for a minute i can repeat the process).

I have no clue what to do. And yes, to turn down the vref i turned the pot counterclockwise. I don't have a fan blowing directly on the drivers. Any clues as to keep everything from shutting down and why, even at minimum vref, everything is too hot? I barely ran my printer for ten minutes when it shut down. I'm desperate for answers

]]> Thu, 29 Oct 2015 00:34:53 +0000 https://www.soliforum.com/post/108470/#p108470