nuckollsr(at)cox.net
Guest
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 Posted: Sun Sep 24, 2006 1:02 pm Post subject: Z13/8 & Z32 Relays (was Eeeeek! Another fear and questio |
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At 10:57 PM 9/23/2006 -0400, you wrote:
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Would a solid-state relay, like the power link Jr.
<http://www.periheliondesign.com/powerlinkjr.htm> provide a more reliable,
lower current draw solution to the S-704-1 relays shown on Z13/8 and
Z32? What are the disadvantages to this type of relay other than cost?
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Define "reliable". If you mean longer service life, yeah, probably.
Current draw on an S-704 is about 100 mA. If your scrambling for
that small of a savings, perhaps you need to re-evaluate your
e-bus loads vs. battery sizing. No disadvantage at all other than
cost. But in the failure tolerant system, "reliability" of any single
parts is moot.
| Quote: | Other than "tradition" what is the rational for wanting a contact in a
always hot feed of more than a few amps?
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The rationale for both battery contactors being located right
at the battery is to minimize length of always-hot wire in
the airplane when the master switch is OFF. The reasoning
is that post-crash fires are much less likely if the battery's
ability to burn wires is minimized. Hence, small always hot
feeders (dome lights, clock, hobbs meter, etc) have been blessed
in small aircraft because they can be protected at the battery
with 5A or less breaker/fuse.
If one subscribes to this notion (many do not . . . there's
a bunch of airplanes flying with 10 and 15 amp e-bus alternate
feed paths that do not use the relay), then some sort of mini-contactor
is called for.
Bob . . .
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