Bed Heating Issues

[cmore11]

Thought I would test out the new forum with my latest finding.







After a few week layoff (Christmas travel and a dead PC), I finally got my 3d printer dusted off to get back into some printing. First thing I noticed was my bed refused to heat up (I'm using ABS and HIPS). I checked the connections on the board and immediately found the issue. Notice the nice charring on the side of the plug and on the one remaining post attached to the board. Not sure if it was something I did to cause this or if there is an easy fix. Yay.





Hope this image shows up...

[piscanc]

Yep, underrated connectors.
After my failure of main power connector I inspected rest. Same bed connector shows signs of overheating.

I also do a lot of ABS.
I'm thinking of soldiering wires directly on the board.

[JohnOCFII]

Thanks for posting. I'll be sure to check that often.

[cmore11]

I ended up soldering the wires directly to the board and retrying. Got everything wired back up and powered on and heated up the bed. After an hour or so at 100C, the bed shut off again. Looking at the board, I have some charring around the 15A fuse. Not sure what is going on with this board, but it does not seem to want me to print ABS.

[piscanc]

if you have SSR at hand, you can try that...
(ssr - solid state relay) bed output to relay and rely output to bed (directly from PSU), so you put some load off MB.
but SSR should be for DC.
you can use regular relay, but you would have to tune down switching speed.



look at my temps post on G+, could be that your mosFET is overheating.

[rick]

Might also check Power supply wouldn't take but a volt or two to make the Amperage extremely high at the board.

[cmore11]

I have a voltage display on my power supply. Always seems to be running at 12.2 V.

[uzi3l]

Jan 21, 2016 14:16:04 GMT cmore11 said:

I have a voltage display on my power supply. Always seems to be running at 12.2 V.

can you tell me now you hooked it up and where you got voltage display from Plz   

[piscanc]

Jan 21, 2016 14:34:42 GMT uzi3l said:

Jan 21, 2016 14:16:04 GMT cmore11 said:

I have a voltage display on my power supply. Always seems to be running at 12.2 V.

can you tell me now you hooked it up and where you got voltage display from Plz   

www.lightinthebox.com/v20d-0-56-led-two-line-3-digital-direct-current-voltmeter-meter-module-white-green-dc-2-5-30v_p523750.html  (i have one like this)
www.miniinthebox.com/hzdz-3-digit-red-led-digital-voltage-meter-dc-4-5v-30-0v_p1444876.html
something like this? you can get it without holder (like me)
simple, red on +, back on COM. (if you switch nothing should go wrong, except negative voltage will be shown)

of course you can get ones that measure amps too, but for our kind of loads they can get expensive.And wiring gets bit more complicated

[cmore11]

Yeah. Basically what pisanc said. I got mine off Ebay awhile back. They come in a variety of colors.

www.ebay.com/itm/141794941356?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT


Mine looks like this:

[rick]

Great idea. Going to have to get me one of them.