Re: Central Vac overload

["Robert Green" <robert_green1963@xxxxxxxxx>]

"B Fuhrmann" <b-fuhrmann-usenet@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:5YKdnQmvO-OYEynWnZ2dnUVZ_jsAAAAA@xxxxxxxxxxxxx
> > It's counter-intuitive, but I guess the motor RPM would decrease while
> > overloaded, not obviously increase, which does make for a sort of
"runaway
> > Toyota" feel.
>
> Actually, the motor increases in speed because there is less load on it.
> It is much easier to spin the fan in less than normal air without doing
any
> work to move air.
> This is the reason that the noise level goes up.

I said that backwards.  The RPM does decrease when the motor is overloaded
but the key to that is a blocked hose isn't really a motor overload.

The irony/complicating factor is that the motor will thermally overload
eventually due to the blocked air flow but not from being asked to do more
work than it can handle.  It's doing less work than normal (4 amps less on
the Kill-o-watt meter) but it's not getting proper cooling anymore.

Thanks!

--
Bobby G.