Today's Message Index:
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1. 06:46 AM - Re: Main Battery Contactor (Robert L. Nuckolls, III)
2. 07:31 AM - Re: Main Battery Contactor (Robert L. Nuckolls, III)
3. 06:37 PM - Re: Re: First Engine Start Problem (Dan Billingsley)
4. 07:50 PM - Re: First Engine Start Problem (user9253)
Message 1
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| Subject: | Re: Main Battery Contactor |
At 08:32 PM 12/28/2011, you wrote:
>
>Hey Bob...
>
>I'm looking at Z-12! Can you tell me the difference between the
>Battery Contactor(no number)
>on Z-12 and B&C's - S701-1? Are they the same... and Can the
>S701-1 be used for the main
>battery contactor?
The S701-1 and variants are offered as continuous
duty contactors suitable for use as a battery master,
cross-feed, or other service that does not require
SWITCHING of heavy loads. I.e, the contactor will
provide a useful service life CARRYING large loads
(100+ amps) after the contacts are closed and stable.
S702-1 style contactors are intermittent duty devices
quite unsuited to tasks outlined above but optimized
to manage the large switching loads associated with
starter and landing gear pump motors.
Bob . . .
Message 2
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| Subject: | Re: Main Battery Contactor |
At 08:32 PM 12/28/2011, you wrote:
>
>Hey Bob...
>
>I'm looking at Z-12! Can you tell me the difference between the
>Battery Contactor(no number)
>on Z-12 and B&C's - S701-1? Are they the same... and Can the
>S701-1 be used for the main
>battery contactor?
Why z-12 and not Z-13/8? What kind of airplane
are you building and how do you intend to use it?
Bob . . .
Message 3
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| Subject: | Re: First Engine Start Problem |
Just got back from the airport and found the following:=0A1.I took the amme
ter reading across the Alternate switch (with the Master switch off). I was
reading at 5.2 A with everything on and that was without keying the mic fo
r transmission. I assume that would bump it up even more (didn't get a chan
ce to try that).-=0A2. The Diode between the two buses WAS backwards. I c
hanged it and now my panel lights up when the Master switch is on. Would th
is have had any bearing on why my fuseable link burned or do you think I ne
ed to move some things to the Main bus? The components I have on the E-bus
are as follows:=0ADynon D100, Garmin 396, EIS (engine monitor), SL40 radio,
Transponder, LED Becon and tail position light, Intercom, HZ Stab trim ser
vo. I don't have wing tip position/Nav lights yet but can probably put them
on the main bus along with the other lights when I get them. The other thi
ng I was toying with is moving the D-100 and the 396 over as they both have
back-up batteries Thoughts or suggestions welcome.=0AThanks,=0ADan=0A=0A
=0A=0A>________________________________=0A> From: "Robert L. Nuckolls, III"
<nuckolls.bob@aeroelectric.com>=0A>To: aeroelectric-list@matronics.com =0A
>Sent: Wednesday, December 28, 2011 6:54 PM=0A>Subject: Re: AeroElectric-Li
st: Re: First Engine Start Problem=0A> =0A>--> AeroElectric-List message po
sted by: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>=0A>=0A>A
t 07:39 PM 12/28/2011, you wrote:=0A>> Bob and Joe, thank you for pointing
out both over loading ( I went back and read note 12) and the fact that the
E-bus should be working with the Alternate switch off. To tell the truth,
I have not tried it that way (w/just the Master on). If it does not work I
do see that would mean the diode between the two buses is in backwards. I d
id check the diode position on the Batt Contactor and it IS installed the r
ight way. I now have at the very least, some changing of circuits over to t
he Main bus. Will report back on findings after tomorrow.=0A>=0A>- Blowi
ng a fusible link is a rather non-trivial=0A>- event. 22AWG wire is capa
ble of considerable=0A>- more current than the legacy rating in wire=0A>
- bundles of 5A would suggest.=0A>=0A>- It would be interesting to ge
t a real current=0A>- measurement of all your goodies before you=0A>-
start moving things. Clip an ammeter across=0A>- the alternate feed swi
tch while the master=0A>- switch is off.=0A>=0A>=0A>- Bob . . . =0A>
================0A>=0A>=0A>=0A>=0A>=0A>
Message 4
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| Subject: | Re: First Engine Start Problem |
The diode being backwards was the reason the fusible link burned open. Part of
the starter current was going through the E-Bus circuit. There is a saying that
electricity takes the path of least resistance. Even though there is a big
fat wire going from the battery to the starter, that path is not the least resistance
for ALL of the current. Some of the current will find it easier to
take parallel paths. An analogy is highway traffic. Most cars will take the
multi-lane expressway. But when traffic is very heavy and slows down, some cars
will take side streets. For them it is the path of least resistance.
Your lighting circuit could be moved to the main bus. The E-Bus should handle
5 amps OK. The additional 2 amps while transmitting is of short duration and
should not burn open the fusible link. I will not be offended if Bob or anyone
corrects me.
Joe
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=361963#361963
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