If you don't have an installation manual or circuit diagram
to work from you should have taken a picture at the very
least before pulling everything apart...
It is sounding more and more like you should go and
buy a new motor controller which works in the more
What are you trying to control anyway ?
Easy enough to say now... :)
Having set out for 20+ yrs since last used, it was already well gone as
far as the wiring between boxes so...besides who'dda thunk there was
anything unique going on, anyway?
Not agonna' happen... :) (Altho if there isn't something in the pile of
other pieces-parts in the barn that makes it more convenient (haven't
had time to dig through yet) I did locate a P&B relay at Newark for <$15
that would serve the purpose precisely and I might just go that way.
See follow-up later in this subthread that it turned out to not be so
unconventional after all although won't all go in the small relay box...
Rigging up a remote tethered Start/Stop for the dust collector to carry
"dpb" wrote in message
Taken from old silo unloader to use as second parallel from alternate
location DC in shop...
240V coil relay, 240V 2hp-rated contacts of the mechanical spring
type--load contacts a common and one open/one closed pair. Relay
operates by momentary make/break--when cycled, the spring-loaded
contacts switch positions rather than by being held by continuous load.
Switch is manual pushbotton, START is NO, STOP is NC and one side of
each are common.
The wiring on the unloader was so decrepit I didn't try to trace it out
when salvaging pieces/parts but I'll be darned if I can figure out how
Dad had this wired to work (but I know it did, I was around for years
while still were using it and it was sitting there as was removed and
I can see how to get the START to work, what I haven't got my head
around is the STOP function since it breaks a contact instead of makes
one to cause the relay coil to momentarily energize/release to flip the
I'll see if I can manage an ASCII pictogram here...
When you turn the thing on, part of the current goes through the stop switch
circuit and that current holds the contacts together with the electromagnet
coil. You press stop and the circuit holding the magnet is broken, so the
contacts come apart and no power goes to the machine or the holding coil.
-- Jim in NC
OK, I now know how it was done...as concluded earlier, I was
overlooking/forgetting a key part and now it has come to me what that is...
This switch and relay were mounted on the unloader up _in_ the silo;
normally, however, the whole point of the unloader was to avoid having
to climb the silo every (cold winter, particularly :) ) morning and
throw feed down manually. But, on occasion it would malfunction by
digging in or somesuch and it was necessary.
The controls I've salvaged were therefore in parallel to the "real"
motor starter on the ground and connected via the umbilical cord that
went from the unloader down the silo chute to the ground. The rest of
the control logic and power feed for the motors was there...
Mea culpa, sorry... :(
For my present purpose I've ordered a rated DPDT Form C from Mr Newark
that'll work as desired as couldn't find anything suitable w/o being way
overkill in the various salvaged pieces-parts in the barn...
Anyway, thanks for the input even though it was a snipe hunt owing to me
thinking only of the part of the puzzle was holding in hand when posted...
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