Today's Message Index:
----------------------
1. 11:17 AM - Re: battery contactor vs starter contactor wiring (Ken Ryan)
2. 01:32 PM - Re: battery contactor vs starter contactor wiring (Kent or Jackie Ashton)
3. 01:46 PM - Documentation error? (Paul A. Fisher)
4. 01:58 PM - Re: battery contactor vs starter contactor wiring (Charlie England)
5. 02:13 PM - FW: battery contactor vs starter contactor wiring (Stephen Richards)
6. 02:38 PM - Re: battery contactor vs starter contactor wiring (Paul Millner)
7. 06:13 PM - Re: Anyone have a B&C LR3b Voltage Regulator handy? (Robert L. Nuckolls, III)
8. 06:14 PM - Re: battery contactor vs starter contactor wiring (Robert L. Nuckolls, III)
9. 06:14 PM - Re: battery contactor vs starter contactor wiring (Robert L. Nuckolls, III)
10. 08:05 PM - Can One Oil Temp Resistance Bulb Run Two Instruments? (stearman456)
Message 1
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| Subject: | Re: battery contactor vs starter contactor wiring |
I haven't seen any responses to this. Did I ask a dumb question?
<snip>
Reviewing 13/8 I notice that the battery contactor jumps power from the big
terminal and then switches the coil ground, but the starter contactor
switches coil positive. Why do it differently on one than the other?
<snip>
On Sat, Oct 8, 2016 at 9:44 AM, Ken Ryan <keninalaska@gmail.com> wrote:
> Reviewing 13/8 I notice that the battery contactor jumps power from the
> big terminal and then switches the coil ground, but the starter contactor
> switches coil positive. Why do it differently on one than the other?
>
> Ken
>
>
Message 2
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| Subject: | Re: battery contactor vs starter contactor wiring |
The difference is the fuse. In both of them, grounding the coil circuits actuates
the solenoids but there is no fuse on the battery contactor circuit. If you
visualize the starter contactor wired the same way as the battery contactor,
you would have to bring the output side of the actuating coil back to the cockpit
to the starter switch and thence through a single dedicated fuse. Wiring
it the way it is allows you to use a fuse or CB in the fuse panel.
Just a guess.
-Kent
> On Oct 11, 2016, at 2:15 PM, Ken Ryan <keninalaska@gmail.com> wrote:
>
> I haven't seen any responses to this. Did I ask a dumb question?
>
> <snip>
> Reviewing 13/8 I notice that the battery contactor jumps power from the big terminal
and then switches the coil ground, but the starter contactor switches
coil positive. Why do it differently on one than the other?
> <snip>
>
> On Sat, Oct 8, 2016 at 9:44 AM, Ken Ryan <keninalaska@gmail.com> wrote:
> Reviewing 13/8 I notice that the battery contactor jumps power from the big terminal
and then switches the coil ground, but the starter contactor switches
coil positive. Why do it differently on one than the other?
>
> Ken
>
>
Message 3
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| Subject: | Documentation error? |
I just added a lighting dimmer to my Icom A200. I didn't wire the
dimmer circuit initially, and it was really annoying to be completely
black on a dark night! Anyway, I found this document on the
aeroelectric.com site:
http://www.aeroelectric.com/Installation_Data/Icom/Icom_A200-210_Wiring_D.pdf
At the top of page 2 there is a representation of the connector at the
back of the tray labeled "Wire Entry view of Connector" that shows pins
A and 1 on the left side of the connector. The issue is from the wire
side of the connector pins A and 1 are on the RIGHT side of the
connector (the symbol is labeled backwards). The Icom installation
document has the same connector representation and it is labeled "Front
view" which may confuse someone. This "front view" refers to the front
of the radio, not the front of the plane!
If you take the radio out, sit in the pilot seat and look down the tray,
A and 1 are indeed on the left side! So I think either the symbol is
labeled backwards or it should read "Radio View Of The Connector".
Just to be clear, I added the power line from my dimmer to pin B. Laying
on my back under the instrument panel (wire entry view of the connector)
I added that wire to the top row, second from the RIGHT. And by the way
the dimmer circuit works great, so I'm pretty confident that I got the
right pin!
Sorry if this is nit-picky, but I don't want someone to blindly follow
this document and get things wired backwards! (not that I have ever done
that myself!). The document seems to be seven years old, so maybe I'm
the only one confused!
This document claims to be for both the A200 and the A210. I can only
speak for the A200.
I hope this helps!
Paul A. Fisher
RV-7A N18PF
Message 4
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| Subject: | Re: battery contactor vs starter contactor wiring |
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Message 5
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| Subject: | battery contactor vs starter contactor wiring |
Ken I did send this resending Clive
-----Original Message-----
From: "Stephen Richards" <stephencliverichards@gmail.com>
Sent: =8E11/=8E10/=8E2016 22:07
Subject: RE: AeroElectric-List: battery contactor vs starter contactor wiri
ng
From: Stephen Richards
Sent: =8E08/=8E10/=8E2016 20:01
Subject: RE: AeroElectric-List: battery contactor vs starter contactor wiri
ng
I would say for safety if starter solenoid was switched on negative side an
y grounding fault would energies solenoid with positive switching a ground
would blow fuse a connection to another positive less likely.
With battery solenoid if switched positive it would require a fused positiv
e supply from battery to switch to solenoid, any ground fault would blow fu
se and de energise solenoid, with negative switching any ground fault will
retain solenoid, if on switched side it would energise solenoid but this s
hould not cause any danger unless you happened to have crashed.
Clive
From: Ken Ryan
Sent: =8E08/=8E10/=8E2016 19:13
Subject: AeroElectric-List: battery contactor vs starter contactor wiring
Reviewing 13/8 I notice that the battery contactor jumps power from the big
terminal and then switches the coil ground, but the starter contactor swit
ches coil positive. Why do it differently on one than the other?
Ken
Message 6
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| Subject: | Re: battery contactor vs starter contactor wiring |
>> In both of them, grounding the coil circuits actuates the solenoids but there
is no fuse on the battery contactor circuit. If you visualize the starter
contactor wired the same way as the battery contactor, you would have to bring
the output side of the actuating coil back to the cockpit to the starter switch
and thence through a single dedicated fuse.
Not so!
The battery contractor coil is hard tied to the battery on one end. The other end
of the coil is grounded through the master switch. No fuse.
The starter contractor coil is tied to ground on one end... The other end gets
power via the mag/starter switch, typically via some breaker. On my Cessna it's
the electric fuel pump breaker.
Paul
Message 7
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| Subject: | Re: Anyone have a B&C LR3b Voltage Regulator handy? |
I have several such tools. Usually made
from a screwdriver with an 1/8" blade and
a short piece of .125" i.d. tubing glued
over the end.
An exemplar drawing calls the adjuster
out at just under 0.100" . . .
>My guess is that the screw's head=C2 is about
>1/8" in diameter but that is only a
>guess.=C2 Plus/minus 1/32" would do the trick. Thanks in advance!
Emacs!
Bob . . .
Message 8
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| Subject: | Re: battery contactor vs starter contactor wiring |
At 01:15 PM 10/11/2016, you wrote:
>I haven't seen any responses to this. Did I ask a dumb question?
>
><snip>
>Reviewing 13/8 I notice that the battery contactor jumps power from
>the big terminal and then switches the coil ground, but the starter
>contactor switches coil positive. Why do it differently on one than the other?
so you don't have to protect the control wire.
Bob . . .
Message 9
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| Subject: | Re: battery contactor vs starter contactor wiring |
At 03:30 PM 10/11/2016, you wrote:
><kjashton@vnet.net>
>
>The difference is the fuse. In both of them, grounding the coil
>circuits actuates the solenoids but there is no fuse on the battery
>contactor circuit. If you visualize the starter contactor wired the
>same way as the battery contactor, you would have to bring the
>output side of the actuating coil back to the cockpit to the starter
>switch and thence through a single dedicated fuse. Wiring it the
>way it is allows you to use a fuse or CB in the fuse panel.
>
>Just a guess.
Actually . . . a fact
Bob . . .
Message 10
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| Subject: | Can One Oil Temp Resistance Bulb Run Two Instruments? |
If wired in parallel, can one oil temperature resistance bulb supply oil temperature
information to two separate instruments? I can't fathom why it wouldn't
if all it basically is is a resistor... The specifics are a Rochester bulb (MS28034-1)
installed in the oil tank and wired in parallel to two separate 14v
instruments in two open cockpits.
Thanks,
Dan
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