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sahan.samaranayake
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Join Date: Apr 2017
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IGBT Failure

04/27/2017 12:59 AM

Hi,

We have Parker one SSD 890SD xxx drive and two 890CD drives in our printing press. We kept total system power off for 3 days. When power on after 3 days one of 890CD's IGBT module burnt out with some diodes, and transistors in firing card.

Again we kept total system power off for 5 days and fixed the repaired 890CD drive. Again 2nd 890CD drive's IGBT was burnt at the initial power on. But repaired 890CD as not damaged and it is in working condition.

Can anybody provide idea what could be the reason?

Thank you
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PWSlack
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#1

Re: IGBT failure

04/27/2017 4:00 AM

Parker can.

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aurizon
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#2

Re: IGBT Failure

04/27/2017 6:28 AM

Sounds like startup transients. Can you leave the computer circuit turned off until the motors are up to speed.?

How many HP are the press motors, type of press?

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sahan.samaranayake
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#3
In reply to #2

Re: IGBT Failure

04/27/2017 6:57 AM

Dear Mr.Aurizon

Thank you. Drives are 90kW, 30kW and 18kW. This happened before giving the run command to the motors. Just turn on MCB burn out the IGBT.

90Kw one get power from 3ph 400 VAC. It gives out put to 60 kW 3ph 400 VAC motor and DC bus voltage of 565 VDC. This bus voltage provide power to 30 and 18 kW drives. This drives give out put to 28 and 18 kw 400 VAC motors.
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aurizon
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#4
In reply to #3

Re: IGBT Failure

04/27/2017 8:25 AM

read a few of these IGBT Failure

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RAMConsult
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#5

Re: IGBT Failure

04/27/2017 10:29 AM

Randomly replacing parts without understanding the root cause of what caused them to fail is an exercise in futility. The failures will continue until you look at what's wrong with the equipment external to the drives.

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James Stewart
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#6
In reply to #5

Re: IGBT Failure

04/27/2017 2:23 PM

Yes. This is one of those myriad situations where being a parts swapper will get you nowhere, flat broke, and busted.

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gutmonarch
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#7

Re: IGBT Failure

04/27/2017 6:26 PM

Check for any intruder in the drive. Might be lizard or rodent shorting some power circuits or ants perhaps.

Is the drive situated in a dry place? I mean no adjacent source of moisture or drippings from above?
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sahan.samaranayake
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#9
In reply to #7

Re: IGBT Failure

04/28/2017 9:21 AM

Hi. Thank you for your time.

There was no any observable foreign particles. Drives are located in dry environment and when production starts we start air conditioners. Average temperate after cooling is 27 C.
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FredPrint
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#8

Re: IGBT Failure

04/28/2017 12:23 AM

What sort of printing press is it? Normally offset printing presses, deal with a lot of dust (powder) and crap environments. We have seen lots of IGBT's failure due to poor conditions (humidity and dust) inside the cabinets.
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JRaef
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#10

Re: IGBT Failure

04/28/2017 6:44 PM

At some point something stressed ALL of your IGBTs, but once the first one fails and the drive shuts down, the others don't fail because... wait for it... THE DRIVE IS SHUT DOWN! So when you replaced the IGBT that caused the shutdown, the next marginal IGBT in line became the next weak link in the chain. This is why when you have one failed IGBT, you replace them ALL. So next question, before powering up after all of the IGBTs have been replaced, is why were they damaged? Could be any number of things. Here's my top 5:

  1. Failed DC bus pre-charge circuit, as in the shorting contact is welded, so the pre-charge current limiting resistor is no longer in play and immediately upon energizing, the capacitor charging current causes a ringing voltage on the DC bus that self-commutates the IGBTs out of sequence, which kills them.
  2. Failed DC bus caps, same net efect.
  3. Shorted diode in the rectifier, resulting on AC in the DC bus, excessive ripple and again, self-commutation of the IGBTs.
  4. Failed heat sink cooling fans, resulting in all of the IGBTs being over heated.
  5. Bad firing board for the IGBTs.
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sahan.samaranayake
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#11
In reply to #10

Re: IGBT Failure

05/01/2017 1:51 AM

Dear Mr.JRaef

After first one's IGBT failed still its control part worked. It gave STACK alarm message several time when we try to run that drive even in IGBT in damaged condition where we couldn't initially understand that error code. At that time more than 5 hours 2nd drive also powered and not gave any error message or alarm.

2nd drive went of at initial power on with the repaired drive after keeping 5 days power off 2nd drive.

Thank you for your comments. That 's very helpful.
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Users who posted comments:

aurizon (2); FredPrint (1); gutmonarch (1); James Stewart (1); JRaef (1); PWSlack (1); RAMConsult (1); sahan.samaranayake (3)

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