Re: Central Vac overload

[harry <haroldhrmtg@xxxxxxx>]

On Mar 30, 12:23=EF=BF=BDpm, "Robert Green" <robert_green1...@xxxxxxxxx>
wrote:
> Some of you might remember my question about building a silencing cabinet
> for a central vac. =EF=BF=BDWell, it worked, but too well. =EF=BF=BDThe p=
roblem is now that
> if something gets stuck in the hose, we can no longer hear the immediate
> increase in the motor load the way we used to. =EF=BF=BDOn occasion, the =
unit's
> motor even shuts down from the overload.
>
> Does anyone have any ideas how to detect the "laboring" of the motor so I
> can sound a chime or some other alarm when something clogs the pope - I m=
ean
> pipe - the Pope has enough problems of his own. =EF=BF=BD(-:
>
> I am going to try a test today with my Kill-0-Watt meter to see if there'=
s a
> substantial increase in current draw. =EF=BF=BDI might be able to use a c=
urrent
> sensor to detect the upswing and sound a chime or some other kind of
> warning. =EF=BF=BDI don't want to shorten the life of the motor by lettin=
g the
> thermal overload shut it down after it has overheated.
>
> Thanks in advance
>
> --
> Bobby G.
>
> Crossposted to alt.home.repair;comp.home.automation, follow up in AHR,
> please!

If your sytem is blocked, the motor will in fact draw less current.
The more outlets open/in use, the more current is drawn and the motor
slows down.
Being blocked is just the same as the outlet being closed/ not in use.
Hence a blockage is not detectable except that there is no "suck".