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vankhoa226
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Insulated-Gate Bipolar Transistor Problem

06/20/2010 9:33 AM

Hello every one!

a member in my team has conected power to output of inveter M420 (siemens) supplied to motor and about 6 hours a after that igbt of M420 has broken.

I dont understand because inveter not user but igbt broken
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lyn
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#1

Re: please help me!!

06/20/2010 10:18 AM

What happens if you connect power to the input of the inverter?
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JohnDG
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#2

Re: please help me!!

06/20/2010 10:29 AM

Does the manufacturer's literature state that power can be applied to the output of the inverter?

If not, the state of the drives to the IBGTs is undefined (without knowledge of the circuitry). It may be that the IBGT turned on. With power applied to the output, there would be nothing to limit the current. Hence the soul of the device would leak out - it may have been visible as a small puff of smoke .

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Unredundant
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#3
In reply to #2

Re: please help me!!

06/20/2010 10:58 AM

Excellent elaboration of the "smoke theory"!

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lyn
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#4
In reply to #2

Re: please help me!!

06/20/2010 11:00 AM

And barely audible as a faint "snap".
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JohnDG
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#11
In reply to #2

Re: please help me!!

06/22/2010 5:39 AM

(Oops - just noticed I did "IBGT" - twice! )

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JRaef
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#5

Re: please help me!!

06/20/2010 11:02 AM

"Hence the soul of the device would leak out - it may have been visible as a small puff of smoke ."

Gotta love that characterization...

I don't know of any inverter that can withstand having AC applied to the output terminals without significant damage. More than likely once you replace the IGBT you will discover the next failed component up the chain. The last one I worked on, a 250HP ABB ACS550 drive connected by an HVAC technician, had failed components all the way up the power chain and into the control boards! It would have been cheaper to replace the drive at the outset than repair it one part at a time as we did.

Funny side story to that; He claimed that he had connected it properly right to the bitter end. His reasoning? The terminals in the VFD said "Line" and "Load", the terminals on the motor said "Line", so that's where he connected them. Similarly the terminals on the supply fused disconnect said "Load", so that how he connected them as well! Line-to-Line, Load-to-Load! Made perfect sense to him...

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Unredundant
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#6
In reply to #5

Re: please help me!!

06/20/2010 11:20 AM

Sounds like a decent burial is in order here, rest It's unfortunate soul.

I had to do this with the victim of a lightning strike.

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jmueller
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#9
In reply to #5

Re: please help me!!

06/21/2010 11:23 PM

JRaef,

Interesting, because ABB also makes a somewhat more expensive series of inverters that are designed to survive reverse wiring (power to load side).

--John M.
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Haajee
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#13
In reply to #5

Re: please help me!!

06/22/2010 6:14 AM

I think that IGBTs share the major cost in inverters !
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Haajee
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#7

Re: Insulated-Gate Bipolar Transistor Problem

06/21/2010 12:44 PM

What else you expect after << conecting power to output of an inveter >> ?
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vankhoa226
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#8

Re: Insulated-Gate Bipolar Transistor Problem

06/21/2010 11:03 PM

thank for your help!
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vankhoa226
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#10

thank to your help with my question

06/22/2010 5:25 AM

thanks very much with my question !

I want to known because IGBT of M240 allows hight volt connect to motor (3 hp). When connect power to output M420 with cable link to motor after that motor run about 6 hours . Power did not suplie to input M420 so IGBT did not work and power couldnt tranfer from input thougth to output by IGBT. May be IGBT has problem ??
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JohnDG
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#12
In reply to #10

Re: thank to your help with my question

06/22/2010 6:04 AM

This connection diagram is taken from the Micromaster 420 Operating Instructions:

If you connect it any other way, you can expect trouble.

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Haajee (2); jmueller (1); JohnDG (3); JRaef (1); lyn (2); Unredundant (2); vankhoa226 (2)

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