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Fan on D9 not working

Posted by Fri

Fri

Fan on D9 not working
April 27, 2013 02:16PM

Registered: 11 years ago
Posts: 41

Screwed the fan wire onto D9 while printing and screw driver touched Q3....spark...
Not sure if I had power on D9 before that, but certainly don't have power now when sending M106 S255.
Everything else works fine, did I burn Q2? Any suggestions

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jamesdanielv

Re: Fan on D9 not working
April 27, 2013 02:40PM

Registered: 13 years ago
Posts: 1,797

if it is ramps i think the mosfets handle up to 15amps. do you have seperate and connected power to power pins on ramps board. there are two positive and negative plugins.

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Fri

Re: Fan on D9 not working
April 28, 2013 05:52PM

Registered: 11 years ago
Posts: 41

Thanks James,
It's Ramps 1.4 and all four inputs are connected. I get 12v on both D10 and D8 when turning on the bed and the extruder,
but nothing on D9. What exactly do you mean with seperate and connected?

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jamesdanielv

Re: Fan on D9 not working
April 28, 2013 07:29PM

Registered: 13 years ago
Posts: 1,797

do you have power to both power inputs. there is a 4 pin connector for power. two are for positive, two pins are negative. they actually route to separate power circuits.

you can change the firmware in pins.h look for '== 34' board, so a fan pin exists, just comment out line for extruder pin, and instead assign fan pin.

Edited 1 time(s). Last edit at 04/28/2013 07:32PM by jamesdanielv.

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Andrew Smith

Re: Fan on D9 not working
April 28, 2013 07:45PM

Registered: 13 years ago
Posts: 643

D9 is on the 5A power connector, so if the printer is working at all the fan should run.

It could be pin definitions, motherboard=33 puts the fan on D9,. motherboard=34 puts the fan on D4 (which doesn't have a mosfet but you could connect a sevenswitch to it) and the second extruder heater on D9.