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

[Frank Mc Alinden <fmcalind@xxxxxxx>]

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

No current flow so nothing happens....


Keiths schematic i believe shows A operated..when it is released both legs
of the motor will be connected to gnd and the motor stops very
quickly(dynamic braking).......Whats your application ??

Frank


----- Original Message -----
From: xslash@xxxxxxx
To: ukha_d@xxxxxxx
Sent: Tuesday, June 03, 2003 5:38 PM
Subject: RE: [ukha_d] reversing a 12v line - number of relays?


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


Quoting Keith Doxey <ukha@xxxxxxx>:

> You can use two single pole relays like this....
>
> +12V_______                ______+12V
>             \ ___Motor____
> 0V ________               \______ 0V
>          Relay A         Relay B
>
> A operated B released moves one way
> B operated A released moves the other way
>
> Both operated or both released the motor stops...very quickly because
> you
> activate electronic braking by short circuiting the motor.
>
> If you have +12 and -12V available you can do it like this
>
> +12V_______
>            \ ________ \____ Motor____ 0V
> -12V ______
>          Relay D   Relay M
>
> Where D = direction and M = Movement
>
> HTH
>
> Keith
>
> www.diyha.co.uk
> www.kat5.tv
>
>


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