Posted by NCWayne on June 11, 2013 at 06:38:18 from (173.188.169.54):
The Detroit that drives the bale buster I built last year has a heavy solenoid that's used to shut it down. The way it's designed the duty cycle on it is only something like 30 seconds before it over heats. The way I had to design it, the operator moves a lever, that hits a switch, to shut it down, and then moves the lever back to the start point. Basically it works the same way one of the mechanical shutdowns would but the lkever action hits a switch instead of moving a lever on the injection pump. That part works great, and hasn't been a problem. Instead the problem comes in with the safety shutdown part of the setup. What happens is the guys running it will hit one of the shutdown buttons, either intentionally (like when one lost a pitch fork and ran it through the baler), or they'll bump agaist one and shut it down accidentally. In either case they don't think to reset the button immediately after the engine shuts down. As a result they have already burned up two solenoids since the thing was put into operation. Both times could have been easily prevented, given a little thought, but you know how that goes with 'general labor' nowdays.
Ok, my dillema now is to get it rewired so no more solenoids get burned up. My thinking is to put it on a timer so the 'signal' from either the operator shutdown, or the emergency shutdown trips the timer and sends a timed 'signal' to the solenoid long enough to shut things down, but not long enough to burn it up. Basically the timer will need to close the contacts to the solenoid upon reciept of a signal and keep them closed for x amount of time. Once x amount of time elapses the timer will open the contacts to the solenoid and reset internally, regardless of wether the origional 'signal' goes away or not.
I've been looking at the various types of timers available, On delay, off delay, one shot, etc, etc, and I guess I'm missing something because as I read out the operation of each, none of them seem to operate the way I need it to. I know there are a few of ya'll on here that have done some electrical engineering work and I'm hoping one of ya'll might be able to enlighten me as to which one would work in this application. Too, it's a 12V DC setup. Grainger has some 12V timers but they are the only ones I've really been able to find that has them in the DC voltages. Any ideas of anywhere else that might have some rated at 12V DC as most others I have looked at are all AC rated?
Any help or ideas on another way to do this would be greatly appreciated.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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