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trouble with building Contactor 'Cooler' duty controller

 
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nuckolls.bob(at)aeroelect
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PostPosted: Tue Feb 26, 2013 11:16 am    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
At 11:12 AM 2/26/2013, you wrote:
Quote:
I’m building a SeaRey Rotax 914, and am close on alternator amperage output. After reviewing archives I have now attempted to construct Bob’s ‘Contactor Cooler’. I am very weak on electronics knowledge, but for the $20 investment, I gave it a shot.

I noticed that Caps come is different ratings and materials of construction, and for this stage of the experiment I decided to ignore this and simply purchase the uf ratings as listed on the schematic. Do the voltage ratings or materials of construction matter to this device?

Not especially. Anything over 12v works.
Quote:

I finished assembly today, and noticed that I did not purchase any iN400X diodes (I assume the X could be any available #?) I recognized the 400X as voltage spike protection for avionics, so I decided to proceed without a diode across the contactor coil.

No, the 'x' means don't care. Any number from
0 to 9 is suited to the task.
Quote:

The device worked for three cycles, about 5 seconds each, and simply no longer operates the contactor. There was no smoke and no detectable warmth.

I suspect that the missing diode allowed the coil V-spike to damage my assembly?

That's a fair assumption. What does the contactor do?
If your IRF510 is shorted, the contactor will simply
pull in at full voltage. I suspect that this is what's
happening. Give us a voltage measurement on your contactor
coil when the device is powered up. Also a voltage
measurement at pin 3 of the 555 say 10 seconds after
the device is powered up.

Quote:

If so, can anyone tell me which device is most likely to need replacement? (timer, transistor, diodes, resistors or caps) Not knowing much of electronics, I only know how to test the resistors and diodes, but this is complicated by lack of isolation.

As Lord Kelvin opined many years ago: “When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts advanced to the stage of science.” Let's get the numbers. By the way, thanks
for taking this project on. Let's make sure
the outcome expands your knowledge and the
utility of your airplane.




Bob . . . [quote][b]

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hasbroucka(at)yahoo.com
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PostPosted: Tue Feb 26, 2013 12:34 pm    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
The contactor no longer does anything when wired thru the device, but it works fine without the device.

V across coil is 0
V at pin 5 after 10 sec. is 11.9 (supply V is 12.7)

Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!



The device worked for three cycles, about 5 seconds each, and simply no longer operates the contactor. There was no smoke and no detectable warmth.

I suspect that the missing diode allowed the coil V-spike to damage my assembly?

That's a fair assumption. What does the contactor do?
If your IRF510 is shorted, the contactor will simply
pull in at full voltage. I suspect that this is what's
happening. Give us a voltage measurement on your contactor
coil when the device is powered up. Also a voltage
measurement at pin 3 of the 555 say 10 seconds after
the device is powered up.




If so, can anyone tell me which device is most likely to need replacement? (timer, transistor, diodes, resistors or caps) Not knowing much of electronics, I only know how to test the resistors and diodes, but this is complicated by lack of isolation.

[quote][b]

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hasbroucka(at)yahoo.com
Guest
PostPosted: Tue Feb 26, 2013 1:54 pm    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!


--

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jan(at)CLAVER.DEMON.CO.UK
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PostPosted: Tue Feb 26, 2013 8:56 pm    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
What is the link to the circuit please - I have been looking on your web site but not able to find it

All the best

Jan
On Feb 27, 2013, at 3:06, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] At 11:12 AM 2/26/2013, you wrote:
Quote:
I?m building a SeaRey Rotax 914, and am close on alternator amperage output. After reviewing archives I have now attempted to construct Bob?s ?Contactor Cooler?. I am very weak on electronics knowledge, but for the $20 investment, I gave it a shot.

I noticed that Caps come is different ratings and materials of construction, and for this stage of the experiment I decided to ignore this and simply purchase the uf ratings as listed on the schematic. Do the voltage ratings or materials of construction matter to this device?

Not especially. Anything over 12v works.
Quote:

I finished assembly today, and noticed that I did not purchase any iN400X diodes (I assume the X could be any available #?) I recognized the 400X as voltage spike protection for avionics, so I decided to proceed without a diode across the contactor coil.

No, the 'x' means don't care. Any number from
0 to 9 is suited to the task.
Quote:

The device worked for three cycles, about 5 seconds each, and simply no longer operates the contactor. There was no smoke and no detectable warmth.

I suspect that the missing diode allowed the coil V-spike to damage my assembly?

That's a fair assumption. What does the contactor do?
If your IRF510 is shorted, the contactor will simply
pull in at full voltage. I suspect that this is what's
happening. Give us a voltage measurement on your contactor
coil when the device is powered up. Also a voltage
measurement at pin 3 of the 555 say 10 seconds after
the device is powered up.

Quote:

If so, can anyone tell me which device is most likely to need replacement? (timer, transistor, diodes, resistors or caps) Not knowing much of electronics, I only know how to test the resistors and diodes, but this is complicated by lack of isolation.

As Lord Kelvin opined many years ago: ?When you can measure what you are speaking about, and express it in numbers, you know something about it, when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts advanced to the stage of science.? Let's get the numbers. By the way, thanks
for taking this project on. Let's make sure
the outcome expands your knowledge and the
utility of your airplane.




Bob . . .
Quote:


[b]

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hasbroucka(at)yahoo.com
Guest
PostPosted: Wed Feb 27, 2013 6:29 am    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
The link is http://tinyurl.com/bolkoyc

The list posts are: Post subject: Latching Relay Redux

Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!


--

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jan(at)CLAVER.DEMON.CO.UK
Guest
PostPosted: Wed Feb 27, 2013 3:17 pm    Post subject: trouble with building Contactor 'Cooler' duty controller Reply with quote
Thanks ! Do you know how much electrical noise this circuit generates ?

All the best

Jan
On Feb 27, 2013, at 22:25, Yahoo hasbroucka <hasbroucka(at)yahoo.com (hasbroucka(at)yahoo.com)> wrote:
[quote]
The link is http://tinyurl.com/bolkoyc

The list posts are: Post subject: Latching Relay Redux

Alan ,
HasbrouckA(at)yahoo.com (HasbrouckA(at)yahoo.com)
SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!


--

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
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