The Murphy temperature Switch Gauge I ended up with on my 1115 Changfoid was equipt
with a pre shutdown contact, (about 10 degrees F) prior to the final shutdown, to
which I hooked a buzzer. That gave me the chance more than once to reduce load,
shutdown or fix the problem before the unit went into full auto shutdown under load.
This got used several times Post WILMA.
If you simply interrupt the DC feed to the exciter windings on an ST head,, that
would stop the AC generation but not disconnect the loads resulting in probable
loss of residual magnetism. Not a huge deal if you are set up to “FLASH THE FIELD”
afterwards………… Not to be confused with Mooning the grandstands
That may not be a problem if you don’t have any resistive loads connected,
A better option may be a magnetic contactor like you would use to start a large size air compressor or other large load motor, these are readily available and using a simple relay to interrupt the exciter field would cut power resulting in loss of magnetic field for the contactor and it would open automatically. Those are plentiful and reasonable priced used.
OR
ATS 30 AMP Automatic Line Transfer Switch
Here’s an option for shut down of the load line on the genset from Mike up in Indiana,
I have bought a lot of items from him over the years, gauges, relays, pumps, filters,
and sound shields mainly. He’s always open to offers and is a solid guy.
This particular switch would require one for each leg, but is an option.
mikes_garage_sale
ATS 30 AMP Automatic Line Transfer Switch
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&itemcount=4&sspagename=MERCOSI_VI_ROSI_PR4_PCN_BIX&_trkparms=algo%3DSI%26its%3DI%252BIA%26itu%3DIA%252BUCI%26otn%3D4%26ps%3D42&refwidgetloc=closed_view_item&viewitem=&refitem=130218031638&item=140230714344&refwidgettype=osi_widget&_trksid=p284.m185As far as shutdown during a runaway, why couldn’t we just engage the decompression lever with an automotive door solenoid??
Stopping a diesel that wants to breathe by blocking the intake wouldn’t be easy, I think you would have to use a very positive closing mechanism like those on the GM 2 cycles, a lightweight butterfly like from a carburetor would not do the job.
The throttle setup of the 1115 Changfoid is perfect for the Murphy double acting solenoid.( hard high AMP pull, then light low AMP hold)
To control both auto shutdowns and permanent HZ setting, no messing with that knob each time to get the Hertz set..
I can still warm up at fast idle and push button to go to full speed.
For a lister setup you would want to (assuming 12dc is available), hook self closing spring to the throttle lever and use the solenoid to hold it open (2 amps usage). I have seen posted on the forum several ways to accomplish this with a single acting momentary solenoid that wouldn’t use any power until activated.
A good question is how would you monitor and warn (The shutdown system) of an overspeed condition?
,
vibration, HZ, voltage, flying part detector?
Has anyone had a 6/1 run away, and what was the cause??
Bob P
