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salkar16
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Join Date: Jan 2015
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ABB Drive Short Circuit

01/15/2015 8:44 AM

hello everyone ,

i have a ABB drive ACS550-01-072A-4

drive was working with a ahu system and failed with a short circuit , when opened we found a lizard on (k3747 ic mosfet ) and hence it was short and we replaced with new ic. but still the drive is not getting on. can anyone suggest which component we have to check ??
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Anonymous Poster #1
#1

Re: ABB Drive Short Circuit

01/15/2015 9:18 AM

Check the lizard's teeth, then it's feet.

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Noudge79
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#2

Re: ABB Drive Short Circuit

01/15/2015 9:29 AM

could be a domino effect.

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Crabtree
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#3

Re: ABB Drive Short Circuit

01/15/2015 9:52 AM

Of course. ABB can. Pick up the phone and talk to them.

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JRaef
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#4

Re: ABB Drive Short Circuit

01/15/2015 2:05 PM

That appears to be a DC/DC step-down module regulator, most likely part of the DC/DC power supply that was powering up all of the electronics. Lizardization of that component would likely lead to a catastrophic scrambling or failure of all of the brains of your drive. That in turn might also cause misfires of the power devices, rendering them useless as well.

In my experience, failures of this type are rarely repairable at a cost lower than that of a replacement drive. You will "fight the hydra", meaning you fix one thing, only to find 2 more problems down the line until you have replaced everything anyway, but at 6x the cost of starting fresh.

But regardless of that, this is not something an average technician can handle, it will take specialized instruments and training to have even a chance at repairing this. You need to call ABB.

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Noudge79
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#6
In reply to #4

Re: ABB Drive Short Circuit

01/15/2015 11:56 PM

We got a new word guys for the day it's-- "lizardization".

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Phys
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#8
In reply to #6

Re: ABB Drive Short Circuit

01/16/2015 9:09 AM

Better be careful with that word. Google it and you get hits to a rather questionable site - nothing on that site would be allowed here.

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JRaef
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#9
In reply to #8

Re: ABB Drive Short Circuit

01/16/2015 8:21 PM

Geez, I thought I had made that up...

Just goes to prove "Internet Rule #36" (alternately #34, 35 in some circles).

If it exists, there is someone with a fetish web site for it, or will be soon. No exceptions.

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Andy Germany
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#7
In reply to #4

Re: ABB Drive Short Circuit

01/16/2015 3:35 AM

GA

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NotUrOrdinaryJoe
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#5

Re: ABB Drive Short Circuit

01/15/2015 4:03 PM

I agree. Short circuits will frequently damage the power supply. After the power supply is cooked, AC power can go into other circuits that are depending on the power supply to be feeding only DC.

The internal power supply not only supplies DC, it filters out AC because devices that are expecting the right polarity (especially electrolytic capacitors) will fry when the wrong polarity is applied.

That poor lizzard. It wasn't the Gieco lizzard was it?

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