Heatbed not heating ramps 1.4
March 23, 2014 02:00AM
Hi folks!

I'm having a problem with my heatbed.
When I turn it on there is no red led on my ramps/no voltage on D8 (extruder on D10 works just fine).
Tested the same ramps with a brand new arduino and I had same problem

Do you know what could be the cause of this issue??

Thanks!
Re: Heatbed not heating ramps 1.4
March 23, 2014 10:40AM
There are two incomign 12V power connectors. One connector provides the 12V for just the heated bed output, the other connector provides power to everything else. Did you wire power to both connectors?


"Never argue with stupid people, they will drag you down to their level and then beat you with experience."
Re: Heatbed not heating ramps 1.4
March 23, 2014 06:07PM
Both incoming power connectors read 11.5 volts
Re: Heatbed not heating ramps 1.4
March 23, 2014 09:18PM
What motherboard have you set in firmware?


_______________________________________
Waitaki 3D Printer
Re: Heatbed not heating ramps 1.4
March 23, 2014 11:30PM
RAMPS controls the heatbed by switching the low side of the heatbed to ground or not. If you don't have the +12 on both sides of the heatbed terminals when idle/not calling for heat, then the problem is somewhere in the +power-in/fuse/+heatbed-out circuit.
Re: Heatbed not heating ramps 1.4
March 27, 2014 12:45AM
The POWER IN is ok (It gives 11.6V) on both ramps power input terminals.
How can I test the fuse?
Re: Heatbed not heating ramps 1.4
March 27, 2014 01:11AM
easiest way is a continuity check from pulling fuse out then measuring resistance or continuity.
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