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Alternators - To Fuse or not to fuse - That IS the question

 
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Dave Saylor



Joined: 11 Jan 2015
Posts: 102
Location: GILROY, CA

PostPosted: Sat Aug 12, 2017 5:27 pm    Post subject: Alternators - To Fuse or not to fuse - That IS the question Reply with quote

A pullable breaker on the field is more functional than a fuse since the field draws a lot of current when the engine's not running (the alternator gets hot enough to leave a mark...).  I pull the breaker if I have the master on for any length of time.

--Dave
On Sat, Aug 12, 2017 at 6:11 PM, Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
Quote:
--> AeroElectric-List message posted by: Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)>

I use the breaker in lieu of a switch for the alternator field, should I want to manually disconnect it. If I was to use a fuse, I'd have to also install a switch.


On August 12, 2017 18:55:03 "kearney" <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:

Quote:
--> AeroElectric-List message posted by: "kearney" <kearney(at)shaw.ca (kearney(at)shaw.ca)>

Hi Joe

Thanks for the response. However, the CBs I was referring to are located on the alternator FIELD circuits not the B Leads.

I understand about the ANL fuses on the B Leads and plan to comply with the Z12 architechure in that respect.

Also, to follow up on your comment on a nuisance trip, if a trip occurs, resetting a breaker to confirm that it was indeed a nuisance trip may be risky. If the problem is genuine, resetting the breaker may cause smoke to come out of wires.....

If this logic is correct, then why wouldn't it be *better* to simply use 5A fuses rather than CB's for the Z12.

Cheers

Les




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PostPosted: Sat Aug 12, 2017 8:02 pm    Post subject: Alternators - To Fuse or not to fuse - That IS the question Reply with quote

Les, I think the 'nuisance trips' idea refers to the overvoltage
protection module tripping the field breaker when there is a very short
term excursion above the modules voltage set point. This can
occasionally happen when there's no actual danger to the system from
overvoltage. A fuse makes recovery a lot more...inconvenient.

Charlie

On 8/12/2017 5:47 PM, kearney wrote:
Quote:


Hi Joe

Thanks for the response. However, the CBs I was referring to are located on the alternator FIELD circuits not the B Leads.

I understand about the ANL fuses on the B Leads and plan to comply with the Z12 architechure in that respect.

Also, to follow up on your comment on a nuisance trip, if a trip occurs, resetting a breaker to confirm that it was indeed a nuisance trip may be risky. If the problem is genuine, resetting the breaker may cause smoke to come out of wires.....

If this logic is correct, then why wouldn't it be *better* to simply use 5A fuses rather than CB's for the Z12.

Cheers

Les



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kearney



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PostPosted: Sun Aug 13, 2017 7:00 am    Post subject: Re: Alternators - To Fuse or not to fuse - That IS the ques Reply with quote

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.

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.

Cheers

Les


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Dave Saylor



Joined: 11 Jan 2015
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PostPosted: Sun Aug 13, 2017 7:41 pm    Post subject: Alternators - To Fuse or not to fuse - That IS the question Reply with quote

Well, every just about every plane I've flown with an alternator switch has accidentally been flown with it off.  By me.  Somehow I manage to check "Breakers In" but "Alternator On" occasionally escapes me.  And for as infrequently as I use the breaker as a switch, it works fine for me.  FWIW, my field comes on with the master, through the field breaker.

--Dave

On Sun, Aug 13, 2017 at 8:00 AM, kearney <kearney(at)shaw.ca (kearney(at)shaw.ca)> wrote:
Quote:
--> AeroElectric-List message posted by: "kearney" <kearney(at)shaw.ca (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.

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.

Cheers

Les




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