The Shop > Electronics & IC Programing
Help replacing IGBT's
John Rudd:
Like Andrew said,
Can you take a few snaps of the pcb showing the components?
We can then give you some pointers yo check before you power up.....
Ah..... Just read your other thread.... I remember now, it's a Huanyuang vsd.... I'll try and have a peep at my spare unit...
dawesy:
Hi guys. Thanks for taking time for me. Here's some pics as requested.
I've removed the dud IGBTs in this one but you should see where they were from ( I'd added a repair bridge for testing but removed with the IGBTs )
board topside
toasted IGBT :(
Dawai:
I've often wanted the load carrying components "on a heat sink" away from the digital driving portions of the unit, fan cooled. I tried making a stepper drive in the mid 2000's that did just that. My skills were not enough to create even a mediocre drive.
THE monitoring and controlling of some industrial VFD (Hitachi) was just wonderful, I had one, the no-Habla employees crushed the conduit going to the motor with a pipe, the drive shut down between phases from the direct short. NO damage, just a reset.
I have been scratching my head since, humbled by others engineering.
awemawson:
The three 8 pin DIL's to the right of the IGBT's look suspiciously as though they could be opto-isolators driving the IGBT's with two per package. However there seem to be some components labelled PC1 - PC5 (at least) that could be involved - can't really make out much from the photo.
Dawai, the advantage of these more modern semiconductors is their low forward voltage drop when driven 'on' hence they dissipate far less power than the good old 2N3055 !
PekkaNF:
--- Quote from: awemawson on February 07, 2014, 09:06:33 AM ---....
Dawai, the advantage of these more modern semiconductors is their low forward voltage drop when driven 'on' hence they dissipate far less power than the good old 2N3055 !
--- End quote ---
OT Huh, that brings me way back when I was sent GB and one day one of the linear power supplies (24V, but big amps, even the choke looked like a buzzbox welder) startted getting hot and I rushed into local electronics shop (Chester, I think, with roman walls) and bough a box full of them and some drivers+ resistors. Probably changed least six 2N3055. Poor linear "regulator" = Heatsink full of 3055s was really hot. Electric cabinet was like a sauna.
Just got out of school before thay started to teach about IGBTs. Those fancy ones, that both can be conductive for a little while on totem pole.
Hope you'll get this fixed.
Pekka
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