
FLASH OVER INSIDE THE VSD BUT WHY ???
#1
Posted 27 November 2004 - 06:39 PM
#2
Posted 28 November 2004 - 01:22 PM
1. We have been meggered the Motor & power cables found infinity.
2. PCB copper flashed l damaged.
3. No any capacitor found burst, physically these are in good condition.
4. The drive was on Auto.
5. On the outgoing IGBT single power terminal found severe spark but all the power terminal was very tight, no any loosness observed.
6. VSD incoming breaker was not tripped & power fuses found OK from switchgear.
#3
Guest__*
Posted 03 December 2004 - 08:19 AM
As you have stated that all the capacitors are healthy ( I believe ones on DC link and may be some on Power input filter section ), to cause a kind of severe damage on PCB as you state, only element left out is The IGBT it self .
In case of some problem in the firing sequence of IGBT, flash over may be caused . By the way which ABB drive do you use ,ACS ?
#4
Posted 08 December 2004 - 12:54 AM
From your description of the fault it is difficult for anyone to give solid reason for the failure.
Are you able to post an image (jpg, gif etc) of the failure here?
If not please advise if you have identified any failed components.
Regards,
GGOSS
#5
Posted 08 December 2004 - 08:24 AM
As GGOSS has already said, it is very hard for us to give a useful answer without a better idea of what has happened. A good photograph would certainly be a step in the right direction.
This sort of problem is usualy due to:
- Moisture or water on the pcb - possibly condensation
Conductive or damp dust build up on the pcb - carbon is common
Ionised air passing through the drive - arcing elsewhere
High voltage high energy transients.
Component failure
This list is far from exhaustive, but it does cover the main causes.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#6
Posted 19 March 2008 - 05:55 PM
As GGOSS has already said, it is very hard for us to give a useful answer without a better idea of what has happened. A good photograph would certainly be a step in the right direction.
This sort of problem is usualy due to:
- Moisture or water on the pcb - possibly condensation
Conductive or damp dust build up on the pcb - carbon is common
Ionised air passing through the drive - arcing elsewhere
High voltage high energy transients.
Component failure
This list is far from exhaustive, but it does cover the main causes.
Best regards,
I also recommend you to check up for the following
1) IGBT failure can cause control card failure if directly wired ( ie without optical coupling)
2) Excessive pollution in the atmosphere , check for pollution classes G1,G2,G3,GX ????
3) Did any control voltage mix up happen?
#7
Posted 20 March 2008 - 06:55 AM
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