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nuckolls.bob(at)aeroelect Guest
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Posted: Mon Aug 14, 2017 9:30 am Post subject: Alternators - To Fuse or not to fuse - That IS the questio |
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At 10:00 AM 8/13/2017, you wrote:
Quote: | --> AeroElectric-List message posted by: "kearney" <kearney(at)shaw.ca>
Charlie
Your comment on the OV nuisance trip is interesting. How does one tell if the OV was a temporary, non-threatening excursion or if it is the result of something serious? Resetting the breaker seems risky. |
If there's a real trip of the ov protection system
then resetting one time does not represent a big
risk . . . the ov excursion is well under DO160
limits.
Quote: | Dave's comment about being able to isolate the field field when ship's power is on without the engine makes sense. In that case I wounder if a switch and a fuse would be better. Pulling breakers seems a bit kludgy. |
The z-figures have offered TWO approaches to dC
POWER master switches.
One with the three position master where mid position
is battery only, up position is battery+altenrator
[img]cid:7.1.0.9.0.20170814122057.0708bde0(at)aeroelectric.com.0[/img]
In this case, battery only ops are easily
established with just the switch.
In the past, we've shown that DC PWR MASTER
could be a simple DPST toggle that brings
battery and alternator on together. In
this case, having a field breaker rather
than fuse made it possible to set up
battery only maintenance ops on the ground.
OF course, if the ship was fitted with crowbar
ov protection, then the breaker was already
in place.
Bob . . .
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kearney
Joined: 20 Sep 2008 Posts: 563
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Posted: Tue Aug 15, 2017 6:03 pm Post subject: Re: Alternators - To Fuse or not to fuse - That IS the que |
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Hi Bob
Thank you for the helpful comments. I will likely go with a battery bus and CBs on the Alternator fields. As I also plan to use the B&C volt regulators shown in the Z12, I will also have the requisite OV protection.
Cheers
Les
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