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View Full Version : Name the vfd part?


charlieuk
16-01-2018, 07:29 PM
I have had a friend look a my old blown up vfd and he has tracked the problems down to two components I believe however one has know markings on it and he has asked me if I can try and track down what it is.

The part is in the picture bellow with the arrow pointing too it, it is a standard 2.2kw china vfd
If anyone can offer any help with what and were I may be able to find one it would be great to get it fixed up and to use it as a spare.

many thanks

23606
magicniner
17-01-2018, 12:15 AM
It could be the 5v regulator for the logic and control functions of the VFD?
m_c
17-01-2018, 01:19 AM
Regulator would be my first thought, but why would you have a cutaway on the PCB for a low voltage part?
Cut-out is like an anti-flashover feature, which you normally put on high voltage parts, which makes me wonder if it's some kind of switching regulator that takes high voltage and drops it to low voltage.

Any idea what voltage is going to the mystery component?
charlieuk
17-01-2018, 02:35 PM
cheers for that I will ask if he can find out the voltage.
Clive S
17-01-2018, 06:02 PM
cheers for that I will ask if he can find out the voltage.

Are there no numbers on the part?
magicniner
17-01-2018, 06:04 PM
Are there no numbers on the part?

I think if it was carefully removed it might be possible to see the markings with a low power microscope and lighting at the correct angle.
charlieuk
17-01-2018, 06:37 PM
the markings seam to be smudged and in unreadable, I don't suppose anyone else has another vfd open that they could see if there's has a clear number on it?

many thanks
charlieuk
17-01-2018, 06:54 PM
been diging around more and found this video on youtube I'm not to sure what it all means but looks very similar ???

https://youtu.be/HGpCu9LtfKE?t=20m51s
Clive S
17-01-2018, 07:02 PM
been diging around more and found this video on youtube I'm not to sure what it all means but looks very similar ???

https://youtu.be/HGpCu9LtfKE?t=20m51s

yes that is the vid i was looking for
Doddy
17-01-2018, 07:05 PM
Which would suggest a 2SK1120 - a N-channel MOSFET designed for DC-DC convertors and motor drives - sounds pretty appropriate

http://pdf.datasheetcatalog.com/datasheet/toshiba/2998.pdf

That wirewound resistor nearby looks like it's been pretty hot.