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Message-ID: <3D960D06.32B3CB0@texas.net>
From: John Fields
Organization: Austin Instruments,Inc.
X-Mailer: Mozilla 4.01 [en] (Win95; U)
Newsgroups: sci.electronics.design
Subject: Re: Help with relays please.
References: <6d1ee9ca.0209260427.27bb3c86@posting.google.com>
<3d9c6563.37940215@newstest2.earthlink.net>
NNTP-Posting-Date: Sat, 28 Sep 2002 15:08:50 CDT
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Date: Sat, 28 Sep 2002 20:08:50 GMT
John Woodgate wrote:
>
> I read in sci.electronics.design that David Harmon
> wrote (in <3d9c6563.37940215@newstest2.earthlink.net>) about 'Help with
> relays please.', on Sat, 28 Sep 2002:
> >On 27 Sep 2002 11:42:27 GMT in sci.electronics.design,
> >Daniel Haude wrote:
> >
> >>Put a nice big diode across the terminals of the winch motor (cathode to
> >>the positive terminal, anode to the negative). This will form a
> >>recirculation path for the current when the winch motor is turned off, so
> >>the current will flow through the diode and not be forced through the
> >>opening relay contacts.
> >
> >Should the diode be oriented so that it shorts out the winch motor while
> >the winch is winding in, or while winding out?
> >
> Both. You can get special copper diodes that conduct in both
> directions.(;-)
>
> Dull answer: Use a big fat zener.
---
If the motor is electrically reversible, two BFZ's in series opposition
across the motor terminals might be better!-)
---
John Fields
Professional circuit designer
http://www.austininstruments.com