wardjr wrote:Most PC Supplies will be 12v and you need 24volt.
Until you put a meter on we won't know if this is even an issue.
When it comes to PSU issues it usually comes down to a lack of current (Amperage) or the volume that can flow to a given circuit. Any electronic circuit will only draw what it needs. In this situation if the bed heater is off that PSU is rated with enough power. But with the new bed heater you will need a bigger PSU. All that being said and seeing you've replaced the bed heater (and correct me if I am wrong) that heater can be wired either 12 or 24 volts? Then why mess around with 24 volts at all?
His heater cartridge is still 24 volts. So he still needs a 24 volt supply unless he swaps it out.I still suspect the power supply and the only reason the motors worked with no firmware was due to uncontrolled power routing through the RAMPS.
I am still leaning on the power supply and until that is ruled out I am not going to help much more on this as I don't like following ghost.
I for one am not a fan of PC supplies as most only do half of their current rating unless you buy one of the top brands that are over 100 bucks. The little sealed supplies like the one he has no have failure written all over them. Went through three on one laptop. Nope I am a firm believer that all printers should require and/or come with the common brick type power supply.
I would really like to see one of these here as it will rule out power. Plus as you all said you can never have too much and I am pretty sure that bed alone does 12 amps under initial heating load. At 24 volts that would still be 6 amps. Not leaving much for the rest of the print considering the hot end will do another another 3 amps when it is heating.
My question is right now when you try to move the motors do you have any heaters on?
If you want to confirm if it is a power problem you can do that easy right now.. Simply disconnect the bed and the hot end. Then remove all the stepper drivers except one axis such a X or Y.
Now power up the board, connect to it in your host, and try to send a move command to that axis that still has the driver.. If that motor runs then you know you have a power issue.
http://www.amazon.com/Switching-Transfo … wer+supply
Printing since 2009 and still love it!
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