Re: (ET) New failure mode...

[Dave & Debbie Barden <daveb seanet com>]

as a matter of fact...  yes.  I found and use this relay on my E12S

Mfg. - FUJITSU
                     Mfg.# - FRL-263D048/02CK
                     1-5/16" x 1-1/16" x 7/8"
                     Contact current: 10 amp @ 30 VDC/240 VAC
                     Coil resistance: 2600 ohm 

I get them here http://www.hosfelt.com/

the best thing about these puppies is the price $1.49.  Now they may not 
be 
better than the open style but while debugging fwd/rev relay burn-up 
problem it 
sure is a lot cheaper!  About the same time I found this relay I decided 
to 
protect the relay with an in line fuse which is cheaper yet to replace. 
I've 
used and blown fuses from 2amp to 15amp and have yet to determine where 
these 
power surges are coming from.  The best hypothesis we had was the 
collapsing 
field when the motor stops.  Putting a power resistor and hooking up the 
VOM we 
expected to see a huge spike but didn't.  puzzling...

Also available from hosfet is a socket for the above relay.  they have two 
styles one of which is a little bigger and may be easier to mount and work 
with.  wire it once and never again.  just unplugged the old and plug in 
the 
new  :^)

Since my E12S is still blowing fuses and I haven't traced down the cause I 
have 
no long term experience with these little "cheap" relays.  

If anyone tries them please let us know how they hold up under steady use.

Dave
Seattle
E12S
E15mod
 


> I had a somewhat similiar problem (E12S) - reverse ok, forward 
> intermittent.
> In my case the the reverse relay contacts had welded. One reverse contact
> welded the common and wouldn't let it touch the forward contact.  Well
> actually it finally did and blew off the end of the relay.....
> 
> Is this the problem I've heard that arises from not stopping completely
> going from forward to reverse?
> 
> Did someone find a better protected version of this relay - I don't like
> those contacts out in the open.
> 
> - SteveS
> E12Ss
> E20 (which I got running this weekend!)
> 
> 
> 
> 
> ----- Original Message -----
> From: "Elie, Larry (L.D.)" <lelie ford com>
> To: "Elec-trak list" <>
> Sent: Monday, June 30, 2003 10:21 AM
> Subject: (ET) New failure mode...
> 
> 
> > Well, it's new to me, and even Bill hadn't seen it...
> >
> > My E12 was working fine until last fall, suddenly I couldn't go forward
> > sometimes.  Move the control a few
> > times and it would take right off.  Hmm...  I checked the manual, then 
> > the
> > forward contactors.  They were
> > fine.  I replaced the reverse micro-switch.  Slowly the problem got 
> > worse,
> > until it only went forward about
> > 10% of the time.  I finally called Bill Saturday.  He said I must 
> > either
> > have a bad contactor or a bad reverse
> > switch as the speed control runs the same circuitry forward and 
> > reverse,
> and
> > reverse was fine.  I agreed that
> > this is what it looked like, but I'd already tried everything.  I could
> see
> > the control closing all the
> > micro-switches.  Foreword just wouldn't work....  Then, while engaged
> > 'forward' I pushed the start (first) micro switch with a small blade
> > screwdriver, the motor started instantly.  What had happened is the
> circular
> >
> > plastic speed control spirals that close each micro-switch had worn 
> > more
> > from forward than reverse, the start
> > switch was not closing most of the time; the switch moved but not 
> > enough.
> A
> > simple bend of the bracket with
> > pliers of perhaps .050" was PLENTY and the control works fine now.  I
> called
> > Bill back with the tip, and I'm
> > letting everyone here know too as this was NOT an electrical problem; 
> > just
> > mechanical wear.  Since the
> > E12/14/15 use the same sort of plastic controls, and all our tractors
> > probably have about the same amount of
> > wear, I'm expecting others to begin to see this behavior eventually.
> >
> > Larry Elie
> >
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> > Elec-trak cosmos phy tufts edu
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> >
> 
> 
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