Heat Bed not heating August 03, 2019 08:03AM |
Registered: 4 years ago Posts: 12 |
Re: Heat Bed not heating August 03, 2019 08:25AM |
Admin Registered: 13 years ago Posts: 7,002 |
Re: Heat Bed not heating August 03, 2019 08:59AM |
Registered: 4 years ago Posts: 12 |
Re: Heat Bed not heating August 06, 2019 10:51AM |
Registered: 4 years ago Posts: 12 |
Re: Heat Bed not heating August 06, 2019 11:36AM |
Admin Registered: 13 years ago Posts: 7,002 |
Re: Heat Bed not heating August 06, 2019 12:30PM |
Registered: 4 years ago Posts: 12 |
Quote
Dust
The RAMPS has 2 power circuits, on the board they are marked as 5A and 11Amp power plugs
You need to supply 12v to both of these
The 11amp power plug supplies 12v to the d8 mosfet
The 5amp power plug supplies 12v to everything else (hotend, stepper motors, and the mega)
Re the hot end. If the D10 LED lights the ramps is probably fine.
Yes the electronics can die... the mosfets can be damaged by static electricity, but the fact the the LED turns on, indicates it is fine.
Re: Heat Bed not heating August 06, 2019 11:25PM |
Admin Registered: 13 years ago Posts: 7,002 |
Re: Heat Bed not heating August 07, 2019 02:33AM |
Registered: 6 years ago Posts: 1,007 |
Re: Heat Bed not heating August 07, 2019 03:11AM |
Admin Registered: 13 years ago Posts: 7,002 |
Re: Heat Bed not heating August 07, 2019 06:52AM |
Registered: 4 years ago Posts: 12 |
Quote
Dust
Stop guessing.. measure things.
Check with a multi meter you are getting power
For the bed
plug the -ve probe into D8 - plug (you have to use this -ve pin as this is what is switched on and off)
plug the +ve probe into the D8 +plug
Set the meter to DC voltage, if it doesn't auto scale set it to a voltage higher than 12v
It should read 0 volts dc when off and 12v dc when on.
For the hotend
plug the -ve probe into D10 - plug (you have to use this -ve pin as this is what is switched on and off)
plug the +ve probe into the D10 +plug
Set the meter to DV voltage, if it doesn't auto scale set it to a voltage higher than 12v
It should read 0 volts dc when off and 12v dc when on.
Check your cartage resistance.
Unplug the cartage from the controller and measure the wires it should read about 3.6 ohms for a 12v 40watt cartage.
Re: Heat Bed not heating August 07, 2019 07:39AM |
Admin Registered: 13 years ago Posts: 7,002 |
Re: Heat Bed not heating August 07, 2019 12:01PM |
Registered: 4 years ago Posts: 12 |
Quote
Dust
Maybe the heated bed is actually dead?
You can wire this directly to the power supply.. does it heat up then? (this will continue to heat up uncontrolled till you unplug it)
can you take a few photos oh how you have the bed to the external mosfet to the power supply connected? (have to check your wiring... as we are missing something)