Don,
Do you mean the 50 amp motor CB? Was the relay power circuit
(power to the gear switch) source wired after the motor breaker?
I.E. Pulling the Motor power breaker also removes power from the relay
coil circuit? If so, what other changes from the Lancair wiring
diagram existed?
BTW, I am asking these questions so that if we can find the
cause, we can hopefully prevent an event like this from ever occurring
again.
You asked about the bubbles - my test system is open and when it
stops running, air enters the clear tubing. when the pump starts I can
see which way the bubbles start going. After running a bit, the tube
representing the selected direction is completely full of flowing fluid.
You must re-think the pressure switches again. If the pressure
is less than the desired end system pressure (up or down), then the
switch is closed to allow current,if present, to pass to the associated
relay coil. The only time any pressure switch is open is when the
final desired pressure is reached thus ensuring that relay coil power
is removed so that the pump stops running when the relay opens. Of
course there is a pressure band of perhaps 100-200 psi below the target
that the pressure switch remains open. So, once again, if the pump is
running, both pressure switches are CLOSED because neither has reached
the desired pressure. When the desired pressure is reached, then the
correct switch can OPEN to then open the proper relay (remove coil
power) and stop the motor from running.
Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)