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Short or no short?
So, having listened to all the stuff, it seems to me that there are some
implications. Firstly, a wire has opened. According to what I gather the signature of the event, there was a current spike prior to the open circuit condition. I understand that this probably means that a short occurred, then the point of weakness failed due to the short. In my experience, this point is most likely to be in the motor itself. We also see that temperatures did not vastly alter, which is good, as it would appear that the failure was pretty benign. I'd suggest though that if the thinnest wire is rated at 6 amps, and something failed at a point well below this, that this in itself could be a worry, as it may show a possible weak link, but all should be well, if the system works as normal. One implication I never heard questioned was thatas I understand it, at least through launch, the phase is going to be isolated, but in addition to the motor and the sensor, this will run the other pump in the cell on two phases. OK, so this has been tested as well, and is OK, but it does sound a bit vague, ie, are they intending to put it back on after launch? I imagine this is because of what I mentioned in my last post, ie, if a wire is slapping about, you do not want it live! Of course as the motors do still need to do the same amount of work, you have to draw more current through the remaining windings, and as nothing untoward has occurred in this mode, I imagine it is a great confidence boost, as if there were similar problems in these circuits, it would have shown up, one imagines. It will be interesting to see how this actually works. Brian -- Brian Gaff - Note:- In order to reduce spam, any email without 'Brian Gaff' in the display name may be lost. |
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