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Great experiment,
Scott.
I would expect that the
pump would just get hot if you powered both leads. It might trip the
breaker if you held power on long enough.
Did you really get the pump to run in the "wrong"
direction some of the time? You said "at least six sequential
connections to both wires were made separated by a second or so
(Dn-Up, Up-Dn) and all but one resulted in the pump running primarily in
the down direction with foaming visible in the up direction tube.." Do you
mean the pump keeps running when you connect 12v to the "other" wire? Do
you mean it starts in one direction and then reverses when you connect the
second wire?
If the pump ever runs in
the wrong direction it would open the wrong pressure switch and never shut
down!
Does anyone know how this
motor is wound? I think it is probably a series motor with two field
windings. It should be impossible to do what you reported.
Also, it has been noted that the motor
relays are Ford starter relays. In automotive service they would be
starting and interrupting over ten times the current they see in our
application. Fusing of the contacts should be a rare (if ever,
occurrence). In the instance where relay power is left on for a long
time they could stick in the closed position due to an internal melt down
of some sort.
Thanks again for your experiment, and all
the good info you provide this group. Please don't take this as
criticism.
Like you, I'm just trying to understand why
people have so many problems with the LNC2 gear system.
Fortunately, I have had none, except for a
blown seal and a leaky (in one direction only) dump valve.
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