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by0ung(at)brigham.net
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 Posted: Sun Feb 08, 2009 11:28 pm Post subject: diode on a starter solenoid |
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| Quote: | You mentioned the need for a diode on the starter solenoid to prevent
voltage spikes, what specification of diode is used and how is it wired in?
>>>>>>>>>>>>>>>>.
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First I wired my kolb so that when the starter is activated,,,, nothing
else can be on... that way a spike cant do any damage... I do not have a
diode on mine. If anyone wants a quick schematic let me know.
If you want to put on a diode... most any rectifying diodes should work
fine (little black diode about 1/8 inch diameter and just over 1/4 inch
long).... they will have a line that goes around them on one end, if the
end with the line is toward the negative terminal they will conduct. So the
secret is to put the end with the line on it on the positive terminal and
the other end on the negative terminal of the starter solenoid coil... that
way when the power is applied there will be no flow through the diode....
but when the circuit breaks ( you let go of the starter switch) the energy
stored in the electrical coils that normally creates a back flow will be
absorbed in the diode.
If you put it in backwards,,, it will blow the diode or the fuse to the
starting circuit.
The final test,,,, for safety and to eliminate shaking so you can see
better, disconnect the wire going to the starter,,, and touch a positive
wire to the solenoid coil with the other side attached to the neg, ground.
You should hear it click. When you remove the wire[Boyd] it will click
back and you will see a spark when the wire is removed..... after you
install the diode and do the same test the spark should be much much
smaller. That way you will know it is in correctly and working.
Boyd Young
Kolb MKIIIC
Brigham City Ut.
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Rick Lewis
Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.
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| Posted: Mon Feb 09, 2009 3:55 am Post subject: Re: diode on a starter solenoid |
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Boyd:
The starter solenoid is not the only thing we need to worry about. The starter itself produces high voltage spikes through out the plane. Possibly the diode trick would work on the starter also but I've never tried it. Putting a diode across any relay's coil is a good idea. The only problem is that when the diode goes bad, opens up, you don't know it and radio's get zapped. Knowing this, a diode of at least 1 amp at 600 volts should be used. That's all I've ever used on my starter solenoids and haven't had any problems.
Rick Lewis
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by0ung(at)brigham.net
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| Posted: Mon Feb 09, 2009 8:34 am Post subject: diode on a starter solenoid |
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Boyd:
The starter solenoid is not the only thing we need to worry about. The starter itself produces high voltage spikes through out the plane. Possibly the diode trick would work on the starter also but I've never tried it. Putting a diode across any relay's coil is a good idea. The only problem is that when the diode goes bad, opens up, you don't know it and radio's get zapped. Knowing this, a diode of at least 1 amp at 600 volts should be used. That's all I've ever used on my starter solenoids and haven't had any problems.
Rick Lewis
| Quote: | >>>>>>>>>>>>>>>>>>>>>>>>>>>>
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Rick
this is how I approached the problem... it seems to be fail safe and easy. I did not use the diode but I showed it in the diagram to show proper placement.
Boyd
[img]cid:image001.jpg(at)01C98A99.602FE230[/img]
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rlaird
Joined: 10 Jan 2006
Posts: 373
Location: Houston
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| Posted: Mon Feb 09, 2009 8:51 am Post subject: diode on a starter solenoid |
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So, Boyd, where does the wine chiller plug in? 
On Mon, Feb 9, 2009 at 10:32 AM, boyd <by0ung(at)brigham.net> wrote:
| Quote: |
Rick
this is how I approached the problem... it seems to be fail safe and
easy. I did not use the diode but I showed it in the diagram to show
proper placement.
Boyd
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_________________
~~~~~~~~~~~~~~~~~~~
Robert Laird
formerly: MkIIIc w/ 912ULS & Gyrobee
current: Autogyro Cavalon w/ 914ULS
Houston, TX area
http://www.Texas-Flyer.com |
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by0ung(at)brigham.net
Guest
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| Posted: Mon Feb 09, 2009 12:19 pm Post subject: diode on a starter solenoid |
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So, Boyd, where does the wine chiller plug in?
| Quote: | >>>>>>>>>>>>>>>>>>>>>
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The wine chiller would be item "K" under "repeat as necessary"
I don't have one of those on my kolb, never crossed my mind.
Boyd
Do not archive
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Rick Lewis
Joined: 03 Jul 2007
Posts: 122
Location: Kingston, Tn.
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| Posted: Mon Feb 09, 2009 4:01 pm Post subject: Re: diode on a starter solenoid |
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Boyd:
The way you have your system wired is perfect isolation so much so that the diode is not needed at all to protect the electronics. The diode is however still needed to protect the starter switch contacts. The contacts can actually pit without it. Good job, I'll be using your idea in my plane.
Rick Lewis
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