Wall power Outlet + 3Dprinter

[nismobg]

I have noticed something funny but can not trouble shoot it. 2 power sockets on the wall one for the printer one for a desk lamp. Turn the power to the lamp and the printer resets . Any ideas ? Possible big voltage drop or something ?

[bdring]

What controller are you using?

[nismobg]

Ramps 1.4 + Mega r3 + 750w PSU on another outlet close by I have 1200W PC + Soldering station and more stuff and never had any issues.

[bdring]

I have had that happen myself a few times with printers and Arduinos in general. I thought it might be related to the USB, so I have tried some really long prints off the SD card with the USB unplugged. So far it has not reset.

You can unplug the USB without reseting the Arduino, you just cannot plug it back in.

[nismobg]

Thanks bdring that actually makes a lot of sense.

[canadianavenger]

if it is the USB, try a USB cable which has a ferrite choke attached at the end closest to the arduino.

[SystemsGuy]

Oddly enough, I have *exactly* the same problem - regardless of printing from SD or USB, but it's my soldering station that does it - 100% of the time. It's plugged into the same physical wall socket as the power strip for the Arduino power supply. Of all things, it's not turning the station on, but turning it off that causes the reset!?!

[cvoinescu]

Turning something off is more likely to cause problems than turning it on. All my problems happened when the bandsaw turned off and when the fridge compressor turned off. It's the arcing in the contacts, most likely -- sparks are a great way to generate broad-spectrum RF energy. In fact, the first radio transmitters were spark-gap generators.

Try one of those split ferrite chokes on your power supply cables.

I eventually solved my similar problem by doing three things:

• Ferrite core on the USB cable, three turns;
• Connected printer GND (V- of 24 V supply and digital GND) to earth;
• Used a separate USB-to-serial converter (cheap CP1201 based Chinese board, but Pololu also sell one) and two 6N137 optoisolators.

The first two changes each helped but did not completely solve the problem. I kept them, but I suspect they are redundant now that I have optical isolation.

[bdring]

FWIW: I am stopped using USB power for the Arduino and am using 5V derived from the 12V power supply. It did not help much.

[nismobg]

After further investigation seems like when I turn another device on/off what happens is the power supply gets reset, the 1st thing that comes into my mind is safety switch :
**** my psu is enabled by shorting the enable wire ****
So thinking about it is is possible to be grounding issue or diodes missing or not properly operating on the arduino or ramps , hence shorting the entire chain.