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Subject: RE: [FlyRotary] Re: EWP - series pumps and wacky ideas
Date: Wed, 15 Oct 2003 11:00:45 -0400
Message-ID: <0B27ED95697C4D4CBC82D79E790FE5678B09F2@exchange.rfgonline.com>
Thread-Topic: [FlyRotary] Re: EWP - series pumps and wacky ideas
Thread-Index: AcOTK9RSMZPkU//OTmmm6+DoOTDZPgAAJYYw
From: "Robinson, Chad" <crobinson@rfgonline.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Yeah, that would be fairly simple. Tell me, where do you want this to be =
triggered? I'm a bit confused about what you're trying to sense. Do you =
want to know when the pump is full on? Full off? Partially on?

To be honest, current sensing isn't all it's cracked up to be. One of =
the most useful things to detect would actually be when you have the =
pump turned on but it isn't working. The thing is, that means you have =
to sense when voltage is applied but no current is flowing. That's easy =
enough. But most motors don't fail open, they short out, so current =
WOULD flow, and your breaker or fuse would blow, and there's your =
indication.

So the fuse might be the BEST option.

> -----Original Message-----
> From: John Slade [mailto:sladerj@bellsouth.net]
> Sent: Wednesday, October 15, 2003 10:51 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: EWP - series pumps and wacky ideas
>=20
>=20
> > Current sensing can be done in one of two ways....
> You lost me early in paragraph 1, Chad, and that last thing I need is
> another learning curve right now. I'd prefer to buy something=20
> shrinkwrapped
> that does this.
>=20
> I guess a REALLY simple current flow device would be a fuse.=20
> Just size as
> needed and put up a warning light if it blows.
>=20
>=20
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>=20