I have a master solenoid, Cole Hersee 24143 which is 200A continuous rated which supplies the main connection of power from the battery to the rest of the plane.
the solenoid will switch on and off all day, however after flying (and an engine start) when the master is turned off the solenoid stays closed for anything up to a minute or so.
Am I likely to have contacts that are welding closed? Is there a residual magnetic force keeping it closed?
Check to see if your clamping diode is shorted. do you have the diode installed correctly? Temporarily disconnect it and see if your issue is resolved. These things will leak to ground when hot. Just found almost the same issue on a friends Grumman. It was a leaking diode killing the battery on the starter solenoid.
Hope this helps,
Chris
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Chris Schmitt
Shallotte, NC
RV9A 90970 N614RV
Sold to nice folks in Texas and badly missed.
RV9 in progress
No Diode problems. And yes its installed the right way around, otherwise they vapourise!
I also have a diode on the starter solenoid, however this is the master we are having issues with.
Its the solenoid STICKING on that is the problem. I am wondering if the starter motor could be drawing well in excess of the cont. rating long enough to weld the contacts a bit.
You may be on to something there. You can over current the master during starting and cause it to stick. I installed a better battery (PC680) and the problem went away. Maybe your timing is too high and causing kickback? Anything that can cause an extra load during starting will cause it to stick.
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Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
I have a master solenoid, Cole Hersee 24143 which is 200A continuous rated which supplies the main connection of power from the battery to the rest of the plane.
the solenoid will switch on and off all day, however after flying (and an engine start) when the master is turned off the solenoid stays closed for anything up to a minute or so.
Am I likely to have contacts that are welding closed? Is there a residual magnetic force keeping it closed?
Have I done something wrong here?
Cheers
DB
Get a new one and change it out. It will not fix itself.
__________________
RV-12 Build Helper
RV-7A...Sold #70374
The RV-8...Sold #83261
I'm in, dues paid 2019 This place is worth it!
I had the same issue, change it out. They are not the most precise piece of equipment. It's real hard to hook one of them up wrong so go easy on yourself
The contacts we use in the industrial world don't weld very quickly. Is there another energy source that could be tied to the solenoid? Solenoids don't take much to "hold" after they have been fired - that is, if they are like those we use.
I have installed a really serious solenoid now 225A continuous rated with 600A inrush capacity from Cole Hersee........what more can I do? I am sure the coil is collapsing.....well I think I am, if I cycle the switch I can hear the springs and the slug banging in and out.....but the contact stays made things are still alive .
What kind of solenoids has everyone else been using?
if I cycle the switch I can hear the springs and the slug banging in and out.....but the contact stays made things are still alive .
DB
This sure does sound like the contacts are welding shut-----at least partially so.
I would look for something that is causing a low voltage problem in the start circuit-----engine ground maybe------often times low voltage causes the amps to skyrocket as the load tries to pull the same wattage, which is the real measure of work done.
W=AxV
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Master Solenoid sticking
the 680 is my avionics back up
and the main is a 925.
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Linear Mode
