Using a Diode with your Battery Contactor and Starter Solenoid
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- Опубліковано 8 січ 2017
- A short video describing the purpose and benefit of using a diode with your battery contactor or starter solenoid. How and where to wire the diode to the contactor is shown with a simple circuit.
Your explanation of the use the diode is the best of have seen out on the internet. Thank you for posting!!
Almost. What you need is a snubber. A snubber is a diode in series with a resistor. So, why do you need the resistor. In many electronic circuits, devices are protected from inductive kick back by a diode. The coil in a contactor is not puny like 100 turns of #35 wire on a ferrite coil, it is probably as big as the coil in many magnetos. So, in effect, the diode is shorting out a spark plug when it fires. The diode has a junction that will breakdown because of very high currents in the microsecond range. So, the diode case won't show excessive heat before failure. When the diode junction breaks down, it becomes a resistor and current flows in both directions, shorting the power supply and you have a classic smoke test. A resistor in series with the diode is chosen to limit the current through the diode while also limiting the voltage spike in the surrounding
Great explanation - just what I was looking for
You would think this would be a standard feature on every automotive contactor. Thanks for the suggestion that we add one to our contactor.
4:48
never thought of this , interesting video.
Thank you. I think this simple diode is the reason my friends lift keeps burning up motor controllers. I will pass this info along.
I was involved in building "specialist" vehicles for over 20 years
Thank you for sharing.
thanks for the video:)
Brilliant!
every electric coil device usually needs to be protected from back EMF. Relays, soleniods, etc.
thank you so much!
How would you snub the transient from a mechanical latching contactor?
It just kills me to see relays mounted in the vertical fashion in aircraft. One hard landing and a bounce and you can engage the starter, sheer a few teeth or worse. Relays should be mounted in the horizontal fashion. Especially in aircraft. Just my 2 cents.
Would you also use one on the motor +. -. Wouldn't it also create a inductive load when disengaged maybe causing internal damage.
great explanation.
When you talk about the direction of electric flow do you mean “ Conventional “ current flow ( actually proton flow direction ) or actual electron flow ?
Love this,should always put a diode across the coil windings to stop back electromotive force
Hi my name is Michael and I've built me a Porsche 914 with a 427 Stroker Motor, and I've burnt 2 key switches, so a friend of mine that owns another Porsche Shop told me to put a starter relay like the Ford type, naturally I wanted the best so I went on Amazon and bought a MySpare relay 4 post they gave me to diodes one bigger and one smaller, I couldn't get it to work then I was reading the reviews, and a old farmer said that ya have to ground one of the small posts,so I've done more homework wich led me to your UA-cam, and I'm aware of better Quality Relay, and I am all about better and nothing burning up ,I run Holley Snider Fuelinjected and Msd Timing and Control, that has to go Straight to the Battery, I'm thinking perfect spot for the Diodes, also what type of Lamar or Skytech should I use Before it goes to the Stater Solinoid on the starter ,and the for post do I ground one of the small posts and still run a Diode across both small Terminals ? Aircraft stuff is the Quality I want to be at Overkill every thing no Fires no frying all my Electronics I have a lot of money in it just like Aircraft, can you help me please