Bob,
Questions about the field breaker are a relatively common. I know you
cover the reasoning for the breaker in the discussion about over voltage
protection but it seems there ends up being a disconnect when people look
at the Z diagrams. I kind of suspect that many more people look at the Z
diagrams (seeking a wiring diagram/recipe) than read all parts of the
Aeroelectric connection book, so some may miss the part about crowbars,
etc. I see that you have a descriptive note (18) regarding the crowbar
module..
Maybe it would help people if there were an additional note next to the
field breaker that said something about this being part of the crowbar OV
circuit functionality - maybe refer to your discussion about controlling
alternators. I realize you don't mind answering the same question
multiple times (in the interest of educating an ever changing classroom),
but this could be a place where a tiny amount of additional documentation
speeds the whole process.
Regards,
Matt-
> <nuckolls.bob@aeroelectric.com>
>
> At 12:20 PM 11/18/2009, you wrote:
>> <stol10@comcast.net>
>>
>>Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from
>>the main bus to the S700-2-10 Master. Can I use an in line 5 amp
>>fuse. I would appreciate the advice. Thanks.....Geoff
>
> You're apparently unaware of why the breaker is even there . . .
>
> The Z-figures are intended to display various ARCHITECTURES,
> not recommended wiring diagrams and bills-of-materials. In
> the case of Z-16, it shows the use of fuseblocks in combination
> with a CROWBAR over voltage protection system. A panel re-setable
> breaker is one of the installation requirements for a crowbar
> ov protection system. So when combining with fuseblocks, the
> solitary breaker illustrated is part of the system integration
> task.
>
> Now, if your choice of power distribution protection is
> breakers instead of fuses then the 5A breaker would be
> right on the bus and labeled ALT FIELD. If you're
> going to use some form of field disconnect ov protection
> system, then yes, the 5A breaker could be a fuse . . . but
> not an in-line . . . it would be one of many fuses on the
> main bus.
>
> The simple answer to your question depends on the
> combination of components you're planning to use. In
> all cases, an in-line fuse is not a recommended
> substitute in any case. If you're using fuse blocks
> AND have crowbar ov protection, then you need the breaker
> as suggested.
>
>
> Bob . . .
>
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