PCB Heatbed not getting hot enough October 19, 2012 07:39AM |
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Re: PCB Heatbed not getting hot enough August 10, 2015 01:00PM |
Registered: 8 years ago Posts: 2 |
Quote
Logrod
If your bed is getting to 90C then it's not a simple question of your power supply not having enough oomph (aka amps) - the bed takes no more power at 90C than it does at 40C. There are two possible issues:
1) Your bed is putting out the design wattage (ie no resistance or voltage issues) but that wattage isn't large enough to compensate for the heat loss to the environment above 90C (the heat loss to the environment increases with bed temp so you get to a point where losses balance maximum bed output)
2) Due to increased resistance in bed and/or supply wires or low voltage supply from your power supply your bed isn't capable of delivering design output (again the actual output being equal to the losses to envirnoment at 90C). In this case you need to solve the resistance issue both in the supply wires (use thicker wires) but also in the bed itself as DCG Partworks calculates 41 Watts will not be enough to heat your bed (for what its worth I'd be surprised if your output is as low as 41 W and you're still getting to 90C , this sounds like an error in measuring the resistances. One thing you should make sure of is that you disconnect the bed from the control board (ramps/sanguinolulu) before you measure the resistance. My bed is approx 1.3 Ohms resistance so my 12 volts supply generates 12x12/1.3 = 110 Watts which gets me to 104C (but I do work in a fridge!)
Re: PCB Heatbed not getting hot enough August 10, 2015 02:40PM |
Registered: 10 years ago Posts: 869 |
It doesn't work that way. The circuit's total resistance might be what an ideal resistance would be, but the actual PCB bed's resistance would remain the same plus you'd have a resistor heating up somewhere, wasting power. You could attach the power resistor to an aluminum bed somehow, but then you'd get a hot spot localized. The only time where adding a resistor would work easily is if you were already using an array of them.Quote
batchkrazy
Has anyone tried adding a 3.3 or 10 ohm resistor to thier bed to drop its resistance. 3.3 would bring it down to around .8 and the 10 would drop it down around .9. this would help your bed heat up faster and get to higher temps. not sure what it would do to the rest of the system.
Re: PCB Heatbed not getting hot enough August 10, 2015 02:46PM |
Registered: 8 years ago Posts: 2 |