Heatbed burned up. What happened? November 23, 2014 09:43PM |
Registered: 9 years ago Posts: 38 |
Re: Heatbed burned up. What happened? November 23, 2014 11:28PM |
Admin Registered: 12 years ago Posts: 1,063 |
Re: Heatbed burned up. What happened? November 23, 2014 11:32PM |
Registered: 9 years ago Posts: 38 |
Re: Heatbed burned up. What happened? November 24, 2014 12:35AM |
Admin Registered: 12 years ago Posts: 1,063 |
Re: Heatbed burned up. What happened? November 24, 2014 09:36AM |
Registered: 10 years ago Posts: 869 |
The rise in temperature being called for does not proportionally increase the current being applied to the heated bed. In other words, your bed will draw the exact same current at the same voltage whether you tell it to rise 1 degree over ambient, or 100 degrees over ambient. The different is the amount of time that current is on. The 1 degree rise takes a lot less time to reach the desired temperature than the 100 degree rise.Quote
scubaguy
Issuing a barely even warm command of 30 degrees C. Immediately I heard popping and this track burned up before I could do anything about it.
Re: Heatbed burned up. What happened? November 24, 2014 12:45PM |
Registered: 9 years ago Posts: 38 |
Re: Heatbed burned up. What happened? November 24, 2014 01:24PM |
Registered: 10 years ago Posts: 869 |
That's a little high. 12 volts / 2 ohms = 6 amps. The target usually is 10-11 amps which is right around 1.2 ohms. I guess it's better to be too high of resistance then be too low, but you may have trouble reaching higher temperatures or longer warm up times.Quote
scubaguy
measure roughly 2 ohms resistance.
Re: Heatbed burned up. What happened? November 24, 2014 09:17PM |
Registered: 9 years ago Posts: 38 |
Re: Heatbed burned up. What happened? November 25, 2014 09:04AM |
Registered: 10 years ago Posts: 869 |