Hotend and part fan not working
Posted by ibWizard
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Hotend and part fan not working December 13, 2017 06:59PM |
Registered: 12 months ago Posts: 14 |
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Re: Hotend and part fan not working December 13, 2017 08:09PM |
Registered: 3 years ago Posts: 872 |
Why are both fans connected to the same pin?
Normally, you would have the hotend fan either on all the time, or maybe off only while the hot-end temperature is below 50C or so. The part fan is usually only on when printing bridges and overhangs.
The first test I'd do would be to apply 12V to each pair of fan connectors and see if the fan runs. If it does, the problem is with the RAMPS (or firmware). If not, the issue is with wiring to the fan.
Normally, you would have the hotend fan either on all the time, or maybe off only while the hot-end temperature is below 50C or so. The part fan is usually only on when printing bridges and overhangs.
The first test I'd do would be to apply 12V to each pair of fan connectors and see if the fan runs. If it does, the problem is with the RAMPS (or firmware). If not, the issue is with wiring to the fan.
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Re: Hotend and part fan not working December 13, 2017 09:44PM |
Registered: 12 months ago Posts: 14 |
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Re: Hotend and part fan not working December 13, 2017 10:11PM |
Registered: 3 years ago Posts: 872 |
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Re: Hotend and part fan not working December 13, 2017 11:03PM |
Registered: 12 months ago Posts: 14 |
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Re: Hotend and part fan not working December 13, 2017 11:46PM |
Registered: 7 years ago Posts: 4,070 |
ok...
firstly you have to know that D9 both the + and - pins when off are at 12v. Only when its switched on does D9 - go to gnd and power flows
Looking at the diagram the hotend fan is getting +12v from D9+ and gnd from X min endstop gnd. This fan should always be on
The part cooling fan is over D9+ and D9- so is controlled by firmware
take photos of your wiring, I suspect its not correct
You do have 12v plugged into the ramps in the 5A plug?
Edited 2 time(s). Last edit at 12/13/2017 11:55PM by Dust.
firstly you have to know that D9 both the + and - pins when off are at 12v. Only when its switched on does D9 - go to gnd and power flows
Looking at the diagram the hotend fan is getting +12v from D9+ and gnd from X min endstop gnd. This fan should always be on
The part cooling fan is over D9+ and D9- so is controlled by firmware
take photos of your wiring, I suspect its not correct
You do have 12v plugged into the ramps in the 5A plug?
Edited 2 time(s). Last edit at 12/13/2017 11:55PM by Dust.
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Re: Hotend and part fan not working December 14, 2017 01:00AM |
Registered: 12 months ago Posts: 14 |
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Re: Hotend and part fan not working December 14, 2017 02:38AM |
Registered: 7 years ago Posts: 4,070 |
install the ramps test firmware (no configuring at all, only works on ramps)
It will step back and forth all the stepper (it ignores the endstops) so make sure its away from the ends
It also turns on all the mosfets, but doesn't monitor temperature so unplug the heaters
[reprap.org]
But unless you have played with the pins, or chosen the wrong motherboard, it is unlikely to be firmware
Edited 1 time(s). Last edit at 12/14/2017 02:40AM by Dust.
It will step back and forth all the stepper (it ignores the endstops) so make sure its away from the ends
It also turns on all the mosfets, but doesn't monitor temperature so unplug the heaters
[reprap.org]
But unless you have played with the pins, or chosen the wrong motherboard, it is unlikely to be firmware
Edited 1 time(s). Last edit at 12/14/2017 02:40AM by Dust.
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Re: Hotend and part fan not working December 14, 2017 02:44AM |
Registered: 7 years ago Posts: 4,070 |
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Re: Hotend and part fan not working December 15, 2017 12:27AM |
Registered: 12 months ago Posts: 14 |
Frandvdh and Dust, Thank you both for providing me with things to check. I appreciate your advice and help. This is my first ever 3D printer and it's proving to be quite the challenge. Where can I find the ramps firmware test file? I guess this will determine if the MOSFET is bad. Thanks again.
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Re: Hotend and part fan not working December 15, 2017 10:43PM |
Registered: 12 months ago Posts: 14 |
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Re: Hotend and part fan not working December 16, 2017 02:02AM |
Registered: 7 years ago Posts: 4,070 |
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