Drive Died (arcing between pins on the PCBA)

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In summary: I don't see any indication of a current limiting fuse. Can you please clarify what you are referring to? If the arc is right at a soldered joint, then it's likely the joint itself is the source of the problem. You can try applying a dab of "Glyptol" insulating paint, or ordinary polyurethane woodworker's varnish (oil based) over the solder pads on the next board.
  • #1
MaintenanceMGR
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Hello:

I have a problem with a drive located in a small production area. It has failed three times due to arcing between two inputs to a control board. These inputs are about 5mm apart and the manufacturer is saying that this could be from material collecting on these terminals or from gases. Now I can understand material conducting between the inputs, but gases seems rather far fetched. The drive is not sealed and it is at regular atmospheric pressure and cooled with a small muffin fan. The drive does not use any high voltage conversion and the input voltage is only 480V. I remember that it usually takes about 3000V/mm for a spark to develop in air, but I can't find any thing in that range in the drive.

My question is it possible for an arc to develop spontaneously between to points 5mm apart? And if it is what are some examples of voltage or gases that may be present to facilitate such an event.

BTW: Please forgive my ignorance on some of this, I know enough only to get things wrong.
 
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  • #2
MaintenanceMGR said:
Hello:

I have a problem with a drive located in a small production area. It has failed three times due to arcing between two inputs to a control board. These inputs are about 5mm apart and the manufacturer is saying that this could be from material collecting on these terminals or from gases. Now I can understand material conducting between the inputs, but gases seems rather far fetched. The drive is not sealed and it is at regular atmospheric pressure and cooled with a small muffin fan. The drive does not use any high voltage conversion and the input voltage is only 480V. I remember that it usually takes about 3000V/mm for a spark to develop in air, but I can't find any thing in that range in the drive.

My question is it possible for an arc to develop spontaneously between to points 5mm apart? And if it is what are some examples of voltage or gases that may be present to facilitate such an event.

BTW: Please forgive my ignorance on some of this, I know enough only to get things wrong.

Welcome to the PF.

If the atmosphere is wet and dusty, there could be an accumulation of gunk that helps the arc to happen. Do you see evidence of contamination in other areas of that PCB assembly? Have you considered cleaning and conformally coating the PCBA in that area?
 
  • #3
berkeman said:
Welcome to the PF.

If the atmosphere is wet and dusty, there could be an accumulation of gunk that helps the arc to happen. Do you see evidence of contamination in other areas of that PCB assembly? Have you considered cleaning and conformally coating the PCBA in that area?

The area is pretty clean and not wet. Specifically the area is a show area for customers that does small production runs, so they keep up with standards very well. Also the drive has been installed for 6 months, and recently the original failed and then two replacements failed as well, within 2 weeks from start to finish. So contamination could have caused the first but the succeeding two, ??
 
  • #4
MaintenanceMGR said:
The area is pretty clean and not wet. Specifically the area is a show area for customers that does small production runs, so they keep up with standards very well. Also the drive has been installed for 6 months, and recently the original failed and then two replacements failed as well, within 2 weeks from start to finish. So contamination could have caused the first but the succeeding two, ??

Also we have conducted a study on the incoming power feed, which had nothing of note within a ten day study. My gut is telling me this could be manufacturing issue, but I don't want to take a stand on this without a better understanding of the science and how arc's can form.
 
  • #5
How can you be sure that it was arcing between those 2 pins that caused the failures? Was anything else changed in the environment around the drive shortly before the first one failed? Like a new piece of equipment being used/installed nearby?

Can you post a picture of the pins you are talking about?
 
  • #6
Lead free solder is notorious for "whiskers". Search on "tin whiskers"

http://nepp.nasa.gov/whisker/Is the arc-over right at a soldered joint?
If so,
Try applying a dab of "Glyptol" insulating paint, or ordinary polyurethane woodworker's varnish (oil based) over the solder pads on the next board.

I'd guess 480 makes quite a flash when it goes. Current limiting fuses like Shawmut 101 might help preserve some clues.
 

1. What is "Drive Died (arcing between pins on the PCBA)"?

"Drive Died (arcing between pins on the PCBA)" refers to a situation where the electronic components on a printed circuit board assembly (PCBA) of a drive experience electrical arcing between their pins, leading to the failure of the drive.

2. What causes arcing between pins on the PCBA?

Arcing between pins on a PCBA can be caused by various factors, including high voltage or current surges, moisture or contamination on the PCB, poor soldering or connections, and component defects.

3. How does arcing affect the drive?

Arcing between pins on the PCBA can damage the electronic components and create short circuits, leading to the failure of the drive. It can also cause overheating, which can further damage the drive or even pose a safety hazard.

4. Can arcing between pins on the PCBA be prevented?

Yes, arcing between pins on the PCBA can be prevented by ensuring proper design and manufacturing processes, using high-quality components, and implementing protective measures such as fuses and surge protectors. Regular maintenance and inspections can also help identify potential issues before they cause arcing.

5. Is it possible to repair a drive that has experienced arcing between pins on the PCBA?

In most cases, a drive that has experienced arcing between pins on the PCBA cannot be repaired and will need to be replaced. However, if the damage is minor and limited to a specific component, it may be possible to replace that component and restore the drive's functionality. It is important to consult a professional for proper diagnosis and repair.

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