Yeah, that's the same version of the MEGA I have as well. It's annoying, but I just keep it plugged into an accessible USB port so I can easily plug and unplug it.by naPS - RAMPS Electronics
So, basically this boiled down to the diode. I'm using a large 12v power supply, and it was providing too much power through the D1 diode. So, it's clipped off the board now. I ended up nuking a Mega and 4 Pololu drivers in the process - I imagine it was applying >5v to the board due to the high power being fed into the regulators, and it fried it. Oh well. The drivers themselves were resby naPS - RAMPS Electronics
571-2828376 Is the mouser part number for the 6 position terminal block. You can save a few dollars buying these instead of the male / female connectors listed here. 651-1758364 is the mouser part number for the 2 position terminal block, I think. Although the one listed is definitely less expensive. Also, the only female headers you need are 4 16 pin headers for receiving the drivers. Thereby naPS - RAMPS Electronics
nophead Wrote: ------------------------------------------------------- > The drivers should only take about 10ma from the > 5V rail so you must have something wrong. I think it might be because I'm using the A4988 drivers, not the A4983's. They have their own pull-down resistors in them which I think is causing the increased current draw.by naPS - RAMPS Electronics
jcabrer Wrote: ------------------------------------------------------- > Test each of the drivers individually in each > socket. See if you have shorts in the soldering. > Cut that diode though. I don't recommend using > it. Yeah, gonna nuke the diode for sure. Each of the drivers works individually in each socket. Tested all of them.by naPS - RAMPS Electronics
It's actually not, not with the 4 drivers. The max USB power is 500ma at 5v, which is not enough for this particular MEGA and the 4 drivers. It's enough for 1, sometimes 2 drivers, but not all of them.by naPS - RAMPS Electronics
jcabrer Wrote: ------------------------------------------------------- > Do you have the diode installed on the RAMPS. If > so, cut it. I do, and I've thought about that, but then the problem comes in that the 5v signal from my USB port drops to 3v when I plug in more than 1 driver, and the board doesn't run. I guess I need to provide the board with external power.... I believe 5 volts /by naPS - RAMPS Electronics
I'm using a RAMPS pcb on top of a MEGA 2560. I'm powering the RAMPS with a 12V PSU rated @ 320 watts. Everything is connecting fine, I've tested almost everything, but I think I fried at least one of my megas. The megas run fine plugged into the computer with no RAMPS board attached, and then again with the board attached but carrying no drivers. When there's no drivers on the RAMPS, I'm gettby naPS - RAMPS Electronics