Hello All,
I am using the MK2A heated bed, RAMPS 1.4 and the Taurino Classic to drive my system. I am using a 400W ATX power supply (http://www.coolermaster.com/product/Detail/powersupply/elite-power/elite-power-400w.html)
My heated bed struggles to reach temperatures over 100 C degrees. I tried trouble shooting the issue and found out that the power supply is delivering about 9.5 V to the heated bed when it is on. (the LED on the bed lights up fine). My leads to the bed are 'thick' wires but not as thick as they could be.
Yesterday I found out that ATX power supplies need to be loaded on the 5V line so that the power supply can deliver the voltage and current on the 12V line. So I went out and bought a 12V 50 W bulb.
I hooked up the bulb to the 5V rail and measured a current draw of about 2.5 amps, but the voltage at the heated bed was still 9.5 V.
Do you guys have any idea of whats going on ? My other theory is that the MOSFET used to toggle the heated bed (Q3) has some internal resistance when on which is cause a voltage drop of about 2.5 V.
Any suggestions ?
I am using the MK2A heated bed, RAMPS 1.4 and the Taurino Classic to drive my system. I am using a 400W ATX power supply (http://www.coolermaster.com/product/Detail/powersupply/elite-power/elite-power-400w.html)
My heated bed struggles to reach temperatures over 100 C degrees. I tried trouble shooting the issue and found out that the power supply is delivering about 9.5 V to the heated bed when it is on. (the LED on the bed lights up fine). My leads to the bed are 'thick' wires but not as thick as they could be.
Yesterday I found out that ATX power supplies need to be loaded on the 5V line so that the power supply can deliver the voltage and current on the 12V line. So I went out and bought a 12V 50 W bulb.
I hooked up the bulb to the 5V rail and measured a current draw of about 2.5 amps, but the voltage at the heated bed was still 9.5 V.
Do you guys have any idea of whats going on ? My other theory is that the MOSFET used to toggle the heated bed (Q3) has some internal resistance when on which is cause a voltage drop of about 2.5 V.
Any suggestions ?