HOW TO TEST AND MEASURE AN IGBT
HOW TO TEST AND MEASURE AN IGBT
(OP)
Please help me some one that knows how to measure an IGBT and how to test it.
I´ll appreciate your help
I´ll appreciate your help
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HOW TO TEST AND MEASURE AN IGBT
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RE: HOW TO TEST AND MEASURE AN IGBT
is it made up of 3 heavy terminals (A,B,and C) and 4 small gate lead terminals..?
this is standard ..and if this is the case ..do the following test..
Meter Hook Up DVOM (diodetest)
(+) A to (-) B OPEN
(-) B to (+) B 0.4 volts approx.
(+) A to (-) C 0.4 volts
(-) A to (+) C OPEN
(+) B to (-) C 0.8 volts
(-) B to (+) C OPEN
(+)D to (-)E open
(+)G to (-)F open
good luck...
keep in mind..power is OFF!...no wires or circuit connected to it..
dydt
RE: HOW TO TEST AND MEASURE AN IGBT
http://www.infineon.com/cmc_upload/migrated_files/document_files/Application_Notes/anip031e.pdf
for theory first,
http://www.sz.com/public/english/products/products_m3020.htm
http://www.lorlin.com/AboutLorlin.htm
http://www.isea.rwth-aachen.de/Ww/english/texte/tebe.html
http://www.lemsys.com/FicheTP0620-2.html
etc. for testers
RE: HOW TO TEST AND MEASURE AN IGBT
Thanks again for your help and prompt answer.
Fernando Sanchez
RE: HOW TO TEST AND MEASURE AN IGBT
I would think that you would want to examine the resistance between E and C (no gate signal applied). It should be open in both directions, except for possible small leakage current.
How to test for open condition and not get fooled by the normal leakage current? I'm no electronics expert. But I would say that you should apply two different voltages and look for no substantial change in current. i.e. current at 2 volts is approx the same as current at 1 volt. This should apply in both directions between E and C.... no gate signal applied.... intended only to detect a short circuit.
Or else just compare the resistance on your meter to that of a known-good IGBT. Other comments?
RE: HOW TO TEST AND MEASURE AN IGBT
RE: HOW TO TEST AND MEASURE AN IGBT
RE: HOW TO TEST AND MEASURE AN IGBT
RE: HOW TO TEST AND MEASURE AN IGBT
With respect to the fail is the second time that an inverter fail with that application, it is a pumping system of slurry, i suspect of the cable distance between the inverter and the motor,it is more than 100 ft, 400 ft aprox.
I think that the possible cuase is wave reflected, I'll check the braking resistors and IGBTs fails, and comment to yours the results. Maybe i Have to install an AC reactor line to avoid the problem. Once again thanks for your help.
Best Regards,
Fernando Sánchez
RE: HOW TO TEST AND MEASURE AN IGBT
Could you please give me a hand. I do appreciate that!
RE: HOW TO TEST AND MEASURE AN IGBT
What do you exactly need?
I don´t have read yet "Magic Sinewaves" , but tell me your specific question.
Fernando Sánchez
RE: HOW TO TEST AND MEASURE AN IGBT
http://www.tinaja.com/glib/msinprop.pdf
for Magic Sinewaves
Question:
"...induction motor speed control that may have related to his idea." Which idea in particular?
RE: HOW TO TEST AND MEASURE AN IGBT
Reflected waves can also cause high voltage spikes at the motor end, and can break-down the motor wire insulation, especially if the motor isn't wound with spike-resistant wire. With 400 feet of wire, a load-side reactor should certainly be considered. Mount this as close to the drive as is reasonable.
Other causes could be line-side voltage problems, especially single-phasing problems if the drive is big enough. The filter caps on some bigger drives don't smooth out the ripple you get with single-phasing conditions, and if it is trying to run near full load, you get a lot of excess heating on the lower-end.
If you do find a bad IGBT module, and you still want to repair the drive, I suggest replacing all three of the modules, and checking out the caps and bridge as well. I'm just a service tech, but past experience has shown me that you get better results changing all the modules.