<![CDATA[SoliForum - 3D Printing Community — Upgrading power supply issues.]]> https://www.soliforum.com/topic/2491/upgrading-power-supply-issues/ Fri, 24 May 2013 22:49:12 +0000 PunBB <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23984/#p23984 Well,  I thinned the traces even more today and will test tonight with and inline current meter to get an actual value in circuit.  I did have it working but current draw still to high and you could hear the drag on the other components.

]]> Fri, 24 May 2013 22:49:12 +0000 https://www.soliforum.com/post/23984/#p23984 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23908/#p23908 As you changed the power supply at the same time as the heatbed, have you tried connecting the old heatbed up to the new supply?

]]> Fri, 24 May 2013 11:30:21 +0000 https://www.soliforum.com/post/23908/#p23908 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23895/#p23895 Diecrusher wrote:

Dang, wrong again..... My meter must have been screwy because I checked the pcb heatbead at work today and got a good reading of 1.1ohms, right where it is supposed to be.  So my problem must be somewhere else...... sad

What does your meter read when you just short it's leads together? make sure and minus this reading off of the reading you are getting from the pcb to get accurate results.

]]> Fri, 24 May 2013 05:26:32 +0000 https://www.soliforum.com/post/23895/#p23895 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23844/#p23844 The resistance will change with temperature (colder = higher), but you wouldn't think by that much.

]]> Thu, 23 May 2013 21:09:51 +0000 https://www.soliforum.com/post/23844/#p23844 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23843/#p23843 Dang, wrong again..... My meter must have been screwy because I checked the pcb heatbead at work today and got a good reading of 1.1ohms, right where it is supposed to be.  So my problem must be somewhere else...... sad

]]> Thu, 23 May 2013 21:04:57 +0000 https://www.soliforum.com/post/23843/#p23843 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23803/#p23803 Well, I had another thought also.

The board I eched was 2oz copper, double-sided, but I only etched the one side.  I noticed that even though there are no "bridges" anywhere in the loop, the etched gap is pretty thin.  I am planning on throwing the board on a milling machine and widening the gaps thereby reducing the width of the traces until I arrive at the proper pcb resistance of 1.1ohms.

Thoughts?

Thanks again everyone. smile

]]> Thu, 23 May 2013 15:41:24 +0000 https://www.soliforum.com/post/23803/#p23803 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23763/#p23763 Just measured mine at 1.1 Ohms. So 11 amps at 12.1 volts (as measured).

Since Diecrusher is measuring pretty much half the resistance, could it be that the etched board is twice as thick as mine?

Adrian's idea about etching a second board in series to halve the resistance is a very simple and clever solution.

]]> Thu, 23 May 2013 09:01:12 +0000 https://www.soliforum.com/post/23763/#p23763 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23752/#p23752 you could etch another board and put them in series... double or single sided ? and did you etch both sides ?

]]> Thu, 23 May 2013 05:27:57 +0000 https://www.soliforum.com/post/23752/#p23752 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23751/#p23751 You can theoretically, however, given that the resistor will also have 15amps running through it, the amount of power it would need to dissipate would be huuuuuge. It'd be as hot as the bed itself.

I think the only way you can solve this is etch another board.

Post a pic of the one you made, maybe the issue is obvious.... *shrug*

]]> Thu, 23 May 2013 05:23:12 +0000 https://www.soliforum.com/post/23751/#p23751 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23750/#p23750 Well after some quick math with my novice electronics experience, I may have found the problem.

The resistance of my heat-bed pcb is .5ohm and that combined with 12vdc = 24amps current draw, right?  Well that obviously is way beyond the specs of my power supply.

If the pcb resistance raised to .8ohms it would only draw approx. 15amps and my current 19amp supply might be sufficient.  Could I just add another power resistor to the circuit to achieve this?

]]> Thu, 23 May 2013 05:10:41 +0000 https://www.soliforum.com/post/23750/#p23750 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23736/#p23736 2n2r5 wrote:
RavensCrest wrote:

can someone direct me to the Sanguino mods for power supply?
I look at some of the posts and still don't understand which part needs to be strengthened on sanguino board

http://www.soliforum.com/topic/1819/hea … isonsstls/

thank you,
i was expecting some wiki page but sure. this will work.

]]> Thu, 23 May 2013 04:00:45 +0000 https://www.soliforum.com/post/23736/#p23736 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23651/#p23651 RavensCrest wrote:

can someone direct me to the Sanguino mods for power supply?
I look at some of the posts and still don't understand which part needs to be strengthened on sanguino board

http://www.soliforum.com/topic/1819/hea … isonsstls/

]]> Wed, 22 May 2013 16:14:47 +0000 https://www.soliforum.com/post/23651/#p23651 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23639/#p23639 can someone direct me to the Sanguino mods for power supply?
I look at some of the posts and still don't understand which part needs to be strengthened on sanguino board

]]> Wed, 22 May 2013 14:27:14 +0000 https://www.soliforum.com/post/23639/#p23639 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23618/#p23618 Sounds like an excess current issue shutting the PSU down. Possible short on the board somewhere?

If you measure the resistance for the bed this could show up the problem? Or at least give you an idea of what sort of current it is expecting to draw.

If you were feeling brave (and had no other means to diagnose the issue), you could put both power supplies in parallel, 12v @35A should either work or cause something to melt. Actually that is is daft idea running two unknown switch mode power supplies you 'll probably just end up with a lightning storm in the supplies (nice to watch if you know it is going to happen, not good for the supply) and both would end up dead along with a nice fire if it went pear shaped.

]]> Wed, 22 May 2013 07:59:18 +0000 https://www.soliforum.com/post/23618/#p23618 <![CDATA[Re: Upgrading power supply issues.]]> https://www.soliforum.com/post/23604/#p23604 The QU-BD bed draws 12A, and his heats even faster so it's probably around 15A. The SD draws about 2A with extruder off.

]]> Wed, 22 May 2013 04:49:19 +0000 https://www.soliforum.com/post/23604/#p23604