nuckolls.bob(at)aeroelect
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 Posted: Mon Aug 14, 2017 9:13 am Post subject: Alternators - To Fuse or not to fuse - That IS the questio |
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At 11:41 AM 8/12/2017, you wrote:
| Quote: | --> AeroElectric-List message posted by: "kearney" <kearney(at)shaw.ca>
Bib et Al
I have been reading with interest your monographs on fuses and circuit breakers. I had always thought that CBs were "modern" and fuses were "old school".
So this brings me to an alternator wiring question. Keep in mind this is based on the Z12 architecture with an electrically dependent engine - EFI/EI.
The questions is: why would I use a CB on the primary and backup alternator field circuits? |
because the voltage regulators shown feature
crowbar ov protection that needs an upstream
breaker to allow resetting in case of a nuisance
trip . . . rare.
| Quote: | My rational for thing this is, if the alternator field circuit pops, something is wrong, likely with the alternator. With the Z12 architecture, the backup alternator should immediately come on line and keep me, the electro-goodies and the engine happy. Why would I ever want to push that breaker back in?.
If the backup alternator field CB then also pops, I would then think that something is very seriously amiss. Again, why would I ever want to reset that breaker.
In theory I would still have the battery to get me *somewhere* safely albeit with urgency.
Inquiring minds need to know. |
It's an artifact of the crowbar ov protection system.
If you have a relay-style ov protection module
then an ov condition does NOT trip the breaker . . .
you could use the fuse for field supply 'cause
yes . . . if it pops there is something seriously
wrong. And with Z-12, it's no big deal.
Bob . . .
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