COMM lost way to many times

[Bruceb]

Originally Posted by IKE

Would anyone be interested in doing a DFMEA style deep dive on this?

One might be that I have never used a torque wrench to tighten the terminals on the breaker. The spec sheet I have says up to 50 in*lbs. I am thinking that setting a wrench to 40 in*lbs and offering to snug down all terminals might help lot.

I am not sure what percentage of issues were main breakers, but I know a decent percentage. During inspection, we are asked to do a tug test, and at least a couple robots I have verified via tug test this year were loose later during the event.

Loose batteries terminals would be another item frequently causing voltage drop outs. We check the battery installed, and look at the others for insulation, but we have typically not tug testing every battery terminal.

As there are several other possible areas. Maybe it would be good to do the DFMEA and list of tips on how to stop the failure modes. Thoughts?

DFMEA????

[vhcook]

Originally Posted by Bruceb

DFMEA????

Design Failure Mode and Effect Analysis. It's a Six-Sigma process that has you go through the system listing all the things that could go wrong, how bad it would be if they did, and how hard it is to detect them. After you do that, you take the ones that score the worst and develop plans to remove or mitigate the failure, then rinse and repeat.