nuckolls.bob(at)cox.net
Guest
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 Posted: Sat Sep 15, 2007 11:30 am Post subject: Rotax electrical switches |
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At 10:40 AM 8/28/2007 -0700, you wrote:
| Quote: | I am building my Zenith 701/Rotax 912 electrical system following
Aeroelectric s Z16 diagram because I trust that Bob Nuckolls knows a hell
of a lot more about aircraft electrical systems than I do. I don t even
know enough to fully understand the use of the two switches in the
diagram. I would appreciate if Bob or someone who understands this diagram
can tell me how to use switch S1 (the double poll double throw switch) and
the switch attached to the endurance buss. I also need to understand what
type of switch this second one is. It looks like a single poll on-off type
but I m not certain because it has a ^ symbol in it.
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That's an error in the symbol. The mid positioned ^ symbol
says theres a center-off position. Not so in this case. The
e-bus alternate feed switch is an S700-1-3. SPDT ON-ON or
equal. I've updated the diagram at:
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z16M.pdf
S1 does have three positions. It mimics the functionality of
the famous "split-rocker" master switch widely used on single
engine TC aircraft for decades. It's a DP3P, ON-ON-ON device.
A double pole, progressive transfer switch. Bottom is ALL OFF.
Moving up to the mid position adds the BATTERY only. Top
position is BATTERY+ALTERNATOR.
This is called out as the S700-2-10 switch or equal.
The e-bus alternate feed switch is used to power e-bus
loads only in case of alternator failure. Turn e-bus alternate
feed switch ON. Turn master switch OFF. Continue battery-only
until airport in sight whereupon you can turn the master
switch back up to BATTERY only if there are things on the main
bus useful for approach to landing.
See chapter 17 for more detailed explanation of the endurance
bus architecture and operating philosophy.
Bob . . .
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( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
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