June 27, 2019, 09:09:44 AM
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  Corrosion in the tracks of electrolytic capacitors on kuka drivers

normal_post Author Topic:   Corrosion in the tracks of electrolytic capacitors on kuka drivers  (Read 828 times)

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June 22, 2018, 08:28:37 PM
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raulboter


Hey guys, I'm facing this situation: Some kuka drivers are spoiling and the reason is the corrosion of the tracks of electrolytic capacitors caused by the electrolytic capacitors itselves. Do you guys have already had this problem? Is it normal?
The pictures of this situation are attached on this post

Today at 09:09:44 AM
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June 22, 2018, 08:43:31 PM
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panic mode

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« Last Edit: June 22, 2018, 08:45:21 PM by panic mode »
1) http://www.robot-forum.com/robotforum/kuka-robot-forum/read-first/
2) if you want reply about robot, post it in forum
3) read 1 and 2

June 22, 2018, 09:30:29 PM
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Spirit532


https://www.robot-forum.com/robotforum/kuka-robot-forum/read-first/[/url]

There is nothing in his question that requires reading of that thread.
This is a valid issue that may affect others, which could be a good warning to check the caps before they die in the future.

@raulboter - leaky caps can happen, yes. It's usually due to improper cooling, age, or just bad luck. Yours looks very salvageable, I would clean it thoroughly(but gently), strip the solder mask, and tin the affected areas. Then cover it with high temperature lacquer(conformal coating products exist for this purpose, not expensive) for insulation. And replace the caps of course - with something quality, like Nichicon, Nippon Chemicon, Samsung, and the like.
« Last Edit: June 22, 2018, 09:32:06 PM by Spirit532 »

June 22, 2018, 11:45:31 PM
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panic mode

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https://www.robot-forum.com/robotforum/kuka-robot-forum/read-first/

There is nothing in his question that requires reading of that thread.
[/quote]


Sure there is... Any question requires related info. "Some kuka drivers" is not telling what exact product we are looking at. There is more than one KUKA controller or servo drive.


In general electrolytic capacitors age not too gracefully but some are better than others. They also have poor tolerance, high leakage current etc. On any sufficiently old product, such capacitors are to be replaced.

June 23, 2018, 07:28:03 AM
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Spirit532



Capacitors are capacitors regardless of the product's model number. This looks like a low voltage bus cap(likely logic supply), so tolerance and leakage currents don't matter. Electrolyte leakage currents do matter though :icon_mrgreen:

June 24, 2018, 02:16:49 PM
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panic mode

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nice video showing failure of various components when stressed.
for capacitor skip to 4 minute mark



https://www.youtube.com/watch?v=ptWr0jS-aL8

June 26, 2018, 12:13:58 PM
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Sulivan Visentainer


@raulboter, can you specify what kind of driver is this board? 

Today at 09:09:44 AM
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