Author Topic: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive  (Read 181 times)

Offline Mads Barnkob

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Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« on: July 27, 2019, 04:18:34 PM »
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A teardown of a Danfoss VLT6000 4kW VFD, a run down of the current paths in the system and I show which parts I find to have a value.

Datasheet on the unit: https://www.danfoss.com/en/products/ac-drives/dds/vlt-and-vacon-legacy-drives/vlt-6000/#tab-overview
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Offline rikkitikkitavi

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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #1 on: July 27, 2019, 08:21:19 PM »
Cant watch it, it reminds me to much of the two 37 kW units and the 75 kW units that I bingedived from my previous work and spent a good evening with beer , recovering ferrit-toroids, LEM current sensors, some drive Xformers, all IGBTs (halv bridge units) , rectifiers , capacitors and of course the heatsinks.

It made up a pretty large and heavy box of stuff.

That I unfortunately misplaced during a housemove so it went to the recycling station instead.

Kicking myself repeteadly I still havent forgiven me. Damn it.

Good teardown though. Unfortunately IGBT development have now reached so far that even in quite large units the IGBTs are in sixpacks or sevenpacks (brake chopper style) and thus smaller chips perhaps not so good for coiling en massive scale. But the rest is still useful. The modules that are soledered to the thick-copper-cladding-double-sided-PCB are a b-tch to desolder though.
I recommend dremel of the PCB so there is less heat conductive material, but carefully to prevent damage.
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Offline klugesmith

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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #2 on: August 12, 2019, 09:02:38 AM »
Has anyone else here noticed that VFD makers write very conservative rules about re-forming electrolytic capacitors?
A think I discovered last week, while investigating best practice for consumer electronics that's been without power for 10 or 15 years.

We all know that ancient vacuum-tube gear needs attention to reforming, or replacing, old caps.

Now it appears that if you have a modern VFD, which has been in "spares" stock for one year or more, it seriously needs attention to reforming before being put into service.  Is that a thing that's familiar in the trade? 
https://library.e.abb.com/public/cf2c9be9fc666ebbc1257729002bd7be/Guide_for_capacitor_reforming_Rev_G.pdf

.
I guess it's the equipment makers who would hear about it, if un-reformed drives fail soon after power-up in 1% of the cases, because of capacitor that is statistically weak at maintaining its form.


« Last Edit: August 12, 2019, 09:14:05 AM by klugesmith »

Offline shrad

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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #3 on: August 12, 2019, 09:06:34 AM »
From experience with a former employee, they are stocking spares during approximately two years and every now and then they throw them away to avoid having bad ones in spare

Offline klugesmith

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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #4 on: August 12, 2019, 09:18:15 AM »
That could get expensive if you are talking about 100 kW drives!  (Hmm . . . how big are the drives in Tesla automobiles?)

Mads, how did the unit in your video come to be on your autopsy table?
« Last Edit: August 12, 2019, 09:22:02 AM by klugesmith »

Offline Mads Barnkob

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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #5 on: August 16, 2019, 10:26:19 PM »
That could get expensive if you are talking about 100 kW drives!  (Hmm . . . how big are the drives in Tesla automobiles?)

Mads, how did the unit in your video come to be on your autopsy table?

I was not aware that shelf-life was so short, which is ridiculously short, compared to some systems I have worked on/made service on/restored, they could be 30 year old systems, with some spare parts being just as old or at-least nearing 20 years. I guess it just comes down to things are not made as they used to be :)

I fetched this drive from a scrap yard, I assume it was thrown out due to upgrade or maybe defective, but it has no visible signs inside of being defective.
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Re: Teardown of Danfoss VLT6000 4kW Variable Frequency Drive
« Reply #5 on: August 16, 2019, 10:26:19 PM »

 


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