Hi Shadow,
Thank you for the info.
But if I understand you right, you are putting power to the solenoid to shut off?
I just wanted the other way round. I'd like to have a solenoid cut from power to shut the engine off. And I don't want an electronic solution, just as simple as yours.
We here in Germany get paid for delivering (green) power into the power supply system. And when the grid goes down the engine has to be stopped automatically.
I just can't find a effordable solenoid that is strong enough for my solution.
Does such a door lock solenoid survive being constantly powered?
Regards
Lars
I possibly have a solution for this, but I haven't tried it in full production yet.
Take a look at some of these pictures:
http://www.loligo.com/lister/pictures/Page1.htmlLook at the images labelled "fuel rack shutdown". I have a diesel fuel rack "puller" 12v solenoid that retracts away from the fuel rack when energized. It has a small circuit board that controls two electromagnets in the solenoid: one that "pulls" the plunger in with relatively high amperage, and overcomes an extension spring (hidden by rubber billows.) Then, after a second or so, another electromagnet in the very end of the solenoid turns on (low amperage) and holds the pin in place under tension. Then the first electromagnet turns off. This is a low-amperage way of holding the spring. If power is removed from the system, the holding electromagnet releases, and the spring pushes the plunger back onto the fuel rack.
I don't remember exactly where I got mine, but here is a place to start:
http://www.woodward.com/engine/diesel/diesel2/sol_spsw.cfmI'd send you a .dxf file of the bracket that I made, but i've just upgrade my machine and my old CAD program is refusing to let me export for some reason... ping me in a week or two and I'll see if I have a copy.
JT