On Thursday, May 26, 2016 at 10:52:05 PM UTC-4, Jon Elson wrote:
rangerssuck wrote:


The electrician, who really knows his stuff, pointed out that the controls
stop the motor, but it's really a hydraulic motor that drives the system,
and maybe it coasts a little when the electric motor is shut off. Also, he
pointed out, that the offset changes during the day, maybe as a result of
the fluid heating up. So, my not-at-all educated in hydraulic motors mind
started thinking, what if, instead of shutting of the pump, what if we
installed, right at the motor, the hydraulic equivalent of a DPDT relay
that would disconnect the motor from the pump and put a short across the
motor?
So, they have a single-purpose motor that runs a pump, that runs the
hydraulic motor? Geez, what idiots, of COURSE it will coast with all that
inertia.

Yes, you want a solenoid valve that relieves the pump and blocks the motor.