Today's Message Index:
----------------------
1. 03:07 AM - Re: Battery contactor versus circuit breaker (mmayfield)
2. 03:49 AM - Re: Toggle Switch Failure (reprise) (tomcostanza)
3. 06:49 AM - Re: Re: Battery contactor versus circuit breaker (Robert L. Nuckolls, III)
4. 07:41 AM - Re: Re: Toggle Switch Failure (reprise) (Vern Little)
5. 07:49 AM - Re: Z-16 (jonlaury)
6. 09:52 AM - Re: Re: Toggle Switch Failure (reprise) (Steve Hamer)
7. 10:25 AM - Re: Re: Toggle Switch Failure (reprise) (Andrew Zachar)
8. 12:36 PM - Re: Re: Toggle Switch Failure (reprise) (Vern Little)
9. 01:21 PM - Re: Re: Toggle Switch Failure (reprise) (Vern Little)
10. 01:58 PM - Re: Re: Toggle Switch Failure (reprise) (Dan Billingsley)
11. 02:23 PM - Re: Re: Toggle Switch Failure (reprise) (Andrew Zachar)
12. 02:36 PM - Adding crowbar to older Z-11 architecture (lance553)
13. 03:15 PM - Re: Battery contactor versus circuit breaker (mmayfield)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Battery contactor versus circuit breaker |
Noel,
on a couple of photos I've seen of what I believe is a similar setup (and on this
same plane type), the batt c/b was located right next to the battery where
one might otherwise find a battery contactor on other types, thus it would seem
to offer supply wire protection.
The schematic is exceedingly simple: Batt, to batt c/b, to master switch, to bus.
All in a straight line.
I guess I'm enquiring as to the relative wisdom of this type of main supply-wire
protection versus using a contactor. Bear in mind that it's a very simple electrical
system in either case.
If I'm reading what Bob wrote correctly, he is saying that a contactor allows virtual
complete isolation of the battery in an emergency and consequent reduction
of hazard/risk, and thus might be preferable to a non-accessible battery circuit
breaker in even such a simple system with a low power alternator as this.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318106#318106
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
Vern,
How did you mount the current limiters?
-Tom
--------
Clear Skies,
Tom Costanza
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318107#318107
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Battery contactor versus circuit breaker |
>
>If I'm reading what Bob wrote correctly, he is saying that a
>contactor allows virtual complete isolation of the battery in an
>emergency and consequent reduction of hazard/risk, and thus might be
>preferable to a non-accessible battery circuit breaker in even such
>a simple system with a low power alternator as this
Correct. But if you're considering a pullable C/B as the
battery disconnect device, do you also intend to crank an
engine through this 'switch'? That takes a BIG breaker
and is generally pretty bulky and expensive and serves
so useful purpose for the 'protection' of wires.
Battery and cranking circuits on light aircraft do not
generally get protection from overload. Hence, you do
not find protective devices in this service on any
certified aircraft and exceedingly few OBAM aircraft.
In fact, the FARs speak specifically to this issue
and relieve the designer of adding any such 'protection'.
But crew accessible battery disconnect is another matter.
Many airplanes of yesteryear used the hand operated
switch. A TriPacer I took dual instruction in had the
battery under the passenger seat . . . batter switch
was on the closeout behind the pilots calves as was
a manual push button for the starter. Battery contactors
became useful when batteries were remotely located.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
In my case, I had a terminal block that handled all of the wing wiring
connections. I mounted them there using fast-on connections soldered to the
device. They can be anywhere in series with the lights. Don't use them for
the strobe supply!
They will affect the intensity of wig-wag lights, however. Since they limit
the inrush current it takes longer for the lamps to heat up to maximum
brightness. My fix was to open up the wig-wag flasher and replace the
electrolytic capacitor with a larger value, slowing the flash rate down.
V
--------------------------------------------------
From: "tomcostanza" <Tom@CostanzaAndAssociates.com>
Sent: Thursday, November 04, 2010 3:46 AM
Subject: AeroElectric-List: Re: Toggle Switch Failure (reprise)
> <Tom@CostanzaAndAssociates.com>
>
> Vern,
>
> How did you mount the current limiters?
>
> -Tom
>
> --------
> Clear Skies,
> Tom Costanza
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=318107#318107
>
>
>
> Checked by AVG - www.avg.com
> 08:36:00
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Bob said:
> I'm aware of no commercial-off-the-shelf relays
> with built in diodes and only a few contactors with such
> devices already installed.
Check out http://www.texasindustrialelectric.com/relays.asp. They have several ice cube types w/diode, of varying capacity.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318127#318127
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
Why not for the strobe supply? Are you speaking of the fast-on's or the
terminal block? Just curious.
Steve
--------------------------------------------------
From: "Vern Little" <sprocket@vx-aviation.com>
Sent: Thursday, November 04, 2010 7:36 AM
Subject: Re: AeroElectric-List: Re: Toggle Switch Failure (reprise)
> <sprocket@vx-aviation.com>
>
> In my case, I had a terminal block that handled all of the wing wiring
> connections. I mounted them there using fast-on connections soldered to
> the device. They can be anywhere in series with the lights. Don't use
> them for the strobe supply!
>
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
My fix was to open up the wig-wag flasher and replace the electrolytic
> capacitor with a larger value, slowing the flash rate down.
>
> V
>
>
Vern,
I thought my flasher (from B&C) was a little fast. How difficult was it to
open up? Can you give me an idea of what capacitor I'll find when I open it
up and what type and spread of capacitors to try out to slow down the
flashing?
--
Andrew Zachar
andrew.d.zachar@gmail.com
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
You should only find one capacitor. It's a metal can with a plastic
case. Try doubling the capacitance (in microfarads). It's not
critical.
You can just pry open the bottom to release the tabs and slide the cover
off.
Vern
From: Andrew Zachar
Sent: Thursday, November 04, 2010 10:20 AM
Subject: Re: AeroElectric-List: Re: Toggle Switch Failure (reprise)
My fix was to open up the wig-wag flasher and replace the
electrolytic capacitor with a larger value, slowing the flash rate down.
V
Vern,
I thought my flasher (from B&C) was a little fast. How difficult was it
to open up? Can you give me an idea of what capacitor I'll find when I
open it up and what type and spread of capacitors to try out to slow
down the flashing?
--
Andrew Zachar
andrew.d.zachar@gmail.com
-------------------------------------------------------------------------
-------
Checked by AVG - www.avg.com
08:42:00
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
No, I was referring to the inrush current limiters.
V
--------------------------------------------------
From: "Steve Hamer" <s.hamer@verizon.net>
Sent: Thursday, November 04, 2010 9:49 AM
Subject: Re: AeroElectric-List: Re: Toggle Switch Failure (reprise)
> <s.hamer@verizon.net>
>
> Why not for the strobe supply? Are you speaking of the fast-on's or the
> terminal block? Just curious.
>
> Steve
>
> --------------------------------------------------
> From: "Vern Little" <sprocket@vx-aviation.com>
> Sent: Thursday, November 04, 2010 7:36 AM
> To: <aeroelectric-list@matronics.com>
> Subject: Re: AeroElectric-List: Re: Toggle Switch Failure (reprise)
>
>> <sprocket@vx-aviation.com>
>>
>> In my case, I had a terminal block that handled all of the wing wiring
>> connections. I mounted them there using fast-on connections soldered to
>> the device. They can be anywhere in series with the lights. Don't use
>> them for the strobe supply!
>>
>
>
>
> Checked by AVG - www.avg.com
> 08:42:00
>
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
Another thought I had to tweek the flash rate would be to play with theRC t
ime =0Aconstant. Could try adding a larger resistor as well. Google it and
you will get =0Aa good amount of info.=0ADan=0A=0A=0A=0A=0A________________
________________=0AFrom: Andrew Zachar <andrew.d.zachar@gmail.com>=0ATo: ae
roelectric-list@matronics.com=0ASent: Thu, November 4, 2010 10:20:31 AM=0AS
ubject: Re: AeroElectric-List: Re: Toggle Switch Failure (reprise)=0A=0A=0A
=0A=0A-My fix was to open up the wig-wag flasher and replace the electrol
ytic =0Acapacitor with a larger value, slowing the flash rate down.=0A>=0A>
V=0A>=0A>=0AVern, =0A=0AI thought my flasher (from B&C) was a little fast.
How difficult was it to open =0Aup? Can you give me an idea of what capacit
or I'll find when I open it up and =0Awhat type and spread of capacitors to
try out to slow down the flashing?=0A=0A-- =0AAndrew Zachar=0Aandrew.d.zac
================ =0A
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Toggle Switch Failure (reprise) |
> Another thought I had to tweek the flash rate would be to play with the RC
> time constant. Could try adding a larger resistor as well. Google it and you
> will get a good amount of info.
> Dan
I've spent a lot of time looking at 555 timer circuits about flashing.
The motivation to open the flasher up and start poking around came
from Vern's successful completion of that task.
When I can get around to it, I'll try to capture my experiment and let
everyone know how it goes.
-az
--
Andrew Zachar
andrew.d.zachar@gmail.com
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Adding crowbar to older Z-11 architecture |
I have been flying for several years with Z-11 (no alternator OV disc. contactor)
and an internally regulated alternator. I would like to know whether the simple
and inexpensive step of installing a crowbar OV module as in Z-24 will provide
OV protection. I have read Bob's article on load dump damage and I am able
to turn off my alternator with the panel "OFF/BATT/ON" switch.
My thanks to Bob or anyone else who can answer my question.
Lance
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318171#318171
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Battery contactor versus circuit breaker |
No Bob, the engine is an air-start engine. The start sequence is nothing more than
energising a booster coil and opening a solenoid valve for about 2 seconds
to allow the compressed air in. Starter contactors and cranking currents don't
exist on this plane.
It really sounds from what I'm reading that a battery contactor is the more desirable
and "elegant" solution from a number of different aspects, rather than
a circuit breaker purely serving as "automatic" battery wiring protection.
I know the diagram was only ever intended as a very rough guide for the builder,
but I can only speculate why it was drawn with a breaker on the supply side
instead of a battery contactor.
regards,
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=318179#318179
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|