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RE: reversing a 12v line - number of relays?

To: ukha_d@xxxxxxx
Subject: RE: reversing a 12v line - number of relays?
From: Nick Austin <nick1@xxxxxxx>
Date: Tue, 03 Jun 2003 10:58:34 +0100
Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
References: <000601c3299f$6a7642e0$0200a8c0@xxxxxxx><000601c3299f$6a7642e0$0200a8c0@xxxxxxx>
Reply-to: ukha_d@xxxxxxx

At 08:38 AM 6/3/03 +0100, xslash@xxxxxxx wrote:

> are there any damaging effects by shorting the motor? (as in supplying
+12v to
> both terminals of the motor?)

The motor will be fine.

The spinning motor creates back-EMF so as the contacts open there will
momentarily be a high voltage across the motor terminals.  As the
contacts open and close this can cause arcing.

For you application I can't see this being a problem, but you may want
to choose relays that are rated for controlling inductive loads.  Also
you may need some form of interference suppression.

Nick.

References:
- RE: reversing a 12v line - number of relays?
  - From: "Keith Doxey" <ukha@xxxxxxx>

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