Power supply quick disconnect for Lack Enclosure? Has anyone done this
 

[Solved] Power supply quick disconnect for Lack Enclosure? Has anyone done this  

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(@)
Illustrious Member

Just a note: the C20 socket Einbau-Gerätestecker 24V_16A is NOT DC rated.  The GS21 is DC rated, but only 8.8 A ...  you need to ignore the max power due to other limitations: so the max current is the spec to follow: https://ch.schurter.com/en/datasheet/typ_GS21.pdf .  

Posted : 06/10/2019 9:03 pm
karl-herbert
(@karl-herbert)
Illustrious Member

@tim-m30

thank you for the note, you are right.

I think Direct current and alternating current must be considered for switches. I have tested the device plug with 30V and 20A (1500watts DC power supply) for a few hours -> this did not impress him. My printer did more than 2000 hours, the plugs are still like new.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 06/10/2019 10:03 pm
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(@)
Illustrious Member

It's a lifetime issue: as heat oxidizes the contacts and arcing as the plug is removed, DC resistance increases over time and the connector will eventually fail. For this application? It will probably work well enough for the practical life of the printer. 

Resistance of aged and oxidized tin plate is fine for 120v and higher where the electrons can jump the boundary layers, but gets marginal at 24v and less.  So an occasional unplug/plug cycle will help keep contacts clean; or even add some dielectric grease.

Posted : 07/10/2019 1:02 am
cwbullet
(@cwbullet)
Illustrious Member
Posted by: @tim-m30

It's a lifetime issue: as heat oxidizes the contacts and arcing as the plug is removed, DC resistance increases over time and the connector will eventually fail. For this application? It will probably work well enough for the practical life of the printer. 

Resistance of aged and oxidized tin plate is fine for 120v and higher where the electrons can jump the boundary layers, but gets marginal at 24v and less.  So an occasional unplug/plug cycle will help keep contacts clean; or even add some dielectric grease.

A little sandpaper can help with this.  

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Chuck H
3D Printer Review Blog...
Posted : 07/10/2019 1:24 am
jwvaughn
(@jwvaughn)
Estimable Member

+1 for Anderson Power Pole connectors.  They come in multiple colors, can handle up to 40 amps, are "lockable" so they won't come apart but unlock easily. are unisex but keyed and are a big favorite for amateur radio operators for everything power supplies to antennas.  The one downside is that you really need the crimp tool and it is not cheap!

https://powerwerx.com/anderson-power-powerpole-sb-connectors

Jerry

This post was modified 2 years ago by jwvaughn
Posted : 07/10/2019 1:57 am
rmm200
(@rmm200)
Noble Member
Posted by: @tim-m30

It's a lifetime issue: as heat oxidizes the contacts and arcing as the plug is removed, DC resistance increases over time and the connector will eventually fail. For this application? It will probably work well enough for the practical life of the printer. 

Resistance of aged and oxidized tin plate is fine for 120v and higher where the electrons can jump the boundary layers, but gets marginal at 24v and less.  So an occasional unplug/plug cycle will help keep contacts clean; or even add some dielectric grease.

If we are still talking about XT60H connectors - they are gold plated. I don't expect the plating to ever wear through in normal use.

And this is for the DC side. Would anyone actually unplug the printer in the middle of a print? I would turn it off first... No arcing.

Posted : 07/10/2019 2:23 am
Bunny Science
(@bunny-science)
Noble Member

Caig DeOxit - I became a believer after it stopped antiseptic cleaners rapidly ruining slide contacts on videoscopes. One spray and wipe and the contacts stayed in good shape. No more critical video signal loss at a very bad time to lose visual. I keep both the spray and brush bottle in stock. A little bit lasts a long time.

 

Posted : 07/10/2019 2:48 am
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(@)
Illustrious Member
Posted by: @charles-h13
Posted by: @tim-m30

It's a lifetime issue: as heat oxidizes the contacts and arcing as the plug is removed, DC resistance increases over time and the connector will eventually fail. For this application? It will probably work well enough for the practical life of the printer. 

Resistance of aged and oxidized tin plate is fine for 120v and higher where the electrons can jump the boundary layers, but gets marginal at 24v and less.  So an occasional unplug/plug cycle will help keep contacts clean; or even add some dielectric grease.

A little sandpaper can help with this.  

Sand paper is NOT an answer to oxides. They remove way too much of the plating that you really want to keep.

 

And my post was dealing with the high voltage high power connectors C20 and G21.  Not the XT connectors.

As for the Xt connectors, it is often fun to investigate the gold layer to see just how thin it is, and check to see if the seller has actually tested insertion cycles, and how many cycles it takes to remove the gold completely.  Those gold plated square pins you see around? Typical life is 11 cycles (that's right: eleven, last time I checked).  

This post was modified 2 years ago by --
Posted : 07/10/2019 4:27 am
cwbullet
(@cwbullet)
Illustrious Member
Posted by: @tim-m30
Posted by: @charles-h13
Posted by: @tim-m30

It's a lifetime issue: as heat oxidizes the contacts and arcing as the plug is removed, DC resistance increases over time and the connector will eventually fail. For this application? It will probably work well enough for the practical life of the printer. 

Resistance of aged and oxidized tin plate is fine for 120v and higher where the electrons can jump the boundary layers, but gets marginal at 24v and less.  So an occasional unplug/plug cycle will help keep contacts clean; or even add some dielectric grease.

A little sandpaper can help with this.  

Sand paper is NOT an answer to oxides. They remove way too much of the plating that you really want to keep.

 

And my post was dealing with the high voltage high power connectors C20 and G21.  Not the XT connectors.

As for the Xt connectors, it is often fun to investigate the gold layer to see just how thin it is, and check to see if the seller has actually tested insertion cycles, and how many cycles it takes to remove the gold completely.  Those gold plated square pins you see around? Typical life is 11 cycles (that's right: eleven, last time I checked).  

Not worried about it.  I have unplugged mine at least 30 and they still work fine.  If they start acting up, I will replace them.  Thanks for the heads up.  

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Chuck H
3D Printer Review Blog...
Posted : 07/10/2019 11:01 am
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(@)
Illustrious Member

Here's another idea:

Posted : 07/10/2019 11:14 am
cwbullet
(@cwbullet)
Illustrious Member

I rarely buy from hobby king because of a similar finding.  

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Chuck H
3D Printer Review Blog...
Posted : 07/10/2019 11:28 am
karl-herbert
(@karl-herbert)
Illustrious Member

I'm using since many years (1990 until now) the C20 also on my 4-axis CNC milling machine (24VDC). No oxidation and no explosions.

Only plug the connector when power is off (this is the normal case).

If anybody knows a better solution please let me know (pictures or link - i think that was the original question).

Thank you!

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 07/10/2019 2:46 pm
rmm200
(@rmm200)
Noble Member

I received my XT60H connectors today, from the link above. Yay Amazon!

From what I can tell - they are both authentic Amass  and an incredible value. I checked all the write-ups on fakes.

They have sharp letters, registered symbol, rounded male tips, very firm connection, holes not bored through, Great, even gold plating.

and the female receptacle is even cross drilled at the bottom to let air out.

I checked them under an inspection microscope - and the are the prettiest connectors I have ever seen... Had no idea I had a connector hangup.

I may buy another 10 - just because...

Posted : 08/10/2019 2:09 am
jrdelrey
(@jrdelrey)
New Member

Hello, 

I found this design that might add a cool quick disconnect XT60 + panic connector cable output to the rear short rail of the MK3s. It would be ideal to have 2 XT60s but my CAD skills are not enough to modify it.
https://www.thingiverse.com/thing:4291299

Posted : 20/05/2020 3:00 pm
Alistair
(@alistair-3)
New Member

This is what I was looking for but can anyone share how they are mounting the power supply both on the printer and the enclosure? Thanks

Posted : 13/05/2021 8:16 am
cwbullet
(@cwbullet)
Illustrious Member

@alistair-3

https://www.prusaprinters.org/prints/3450-black-psu-holder

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Chuck H
3D Printer Review Blog...
Posted : 13/05/2021 11:44 am
karl-herbert
(@karl-herbert)
Illustrious Member

@jrdelrey

I just quickly remodeled this - maybe like this?

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 13/05/2021 12:30 pm
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