Hello,
Has ever anyone a problem with overheated cables and connectors[/img]? In my VERTEX K8400 the 2nd time cables are already blown.
The first time (a few weeks ago) it was the plug for Heating cartridge the print head 1 to the mainboard.
Today it is the plug on the print head! See also photo.
Why is that?
If the K8400 may not be designed for a pressure that lasts longer than 20 hours?
How can I post a picture to show you the Disaster?
[quote=“123wuffo”]How can I post a picture to show you the Disaster?[/quote]Find a free image hosting service (google that to find one) and upload your imges there. Then you can copy the provided link between the IMG tags.
Cables are overheating when too much current is drawn. And the plugs when there’s a bad contact. I’ve never experienced that and I’m printing many pieces every day since more than a year. So I have no clue.
Thank’s to raby for information.
Here is the link to the photo!
Why should suddenly more current to flow, so that the cable can be hot?
I’ve nothing here attacked or changed. Is it possible that the motherboard is faulty?
Hi,
I had a prob with the connector for the second nozzle.
my thread:
http://forum.velleman.eu/viewtopic.php?f=59&t=16824
Actually, I will change the heater connector on the main board from the molex connectors
to the same connectors you find on the print head connectors for the fans (the little green parts)
This will allow me to screw the wires to the board instead of this lousy spring pins…
There is no more current, but the pins itself are getting loose and the strength of the flexi pins.
I figured out, while replacing the connector on the board and on the wires, the new connection is much more tide.
It is much more difficulty to disconnect them (as we can say by this little connection)
So in short.
I will replace the heater connectors on the main board in the near future.
I just removed every pin one by one and bend the springy thing further open… Works well for a while now… I noticed a burn mark in the early stage after I noticed one heater took way longer to reach the set temperature. That pin allready got black, but after sanding that pin and bending every pin that carries allot current I hadn’t got any issues whatsoever. And tbh… I really don’t want to solder on the mainboard because im sure it’ll lose warranty…
Kind regards
Jeafke
From what you showed it looks like a problem with the so called “contact resistance”. Having a connector you always have a resistance bewteen both parts of the connectors. This should be some millli-ohms in the beginning, but can degrade and increase over time, acting like a heater and burning the case. (Just remember why HiFi freaks are so keen in using gold plated connectors)
The reasons for degradation can be manifold and will have different impact depending on quality of the contacts.:
The surface finish shall be gold in best case. With this surface the copper is protected against corrosion, which is important when you are in an environment with acid gases (e.g. when printing ABS). So mechanically abrasive treatment will enforce this mechanism. A similar effect can be achieved by too often opening and closing the connector!
The contact force shall be high to have a relative large area in direct contact to have the current spread over a large area. When concentrated to a small point the connector will be locally heated and elecromigration effects will degrade the contact quite fast.
So the replacement of the connector with the molex parts will improve the second effect, to be on the safe side for the first effect you should take care of the surface finishing when installing this alternative.
