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

["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


> -----Original Message-----
> From: xslash@xxxxxxx [mailto:xslash@xxxxxxx]
> Sent: 03 June 2003 07:56
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] reversing a 12v line - number of relays?
>
>
> Frank
>
> thanks for a quick response
>
> I have a load of single pole relays available (i assume
> single as they have 3
> terminals, a,b&c. With out power a&b are connected. With
> power b&c are
> connected). I was wondering if my thinking was correct. I
> assume using 2 of
> these would be the same as a double pole relay
>
> Ade
>
> Quoting Frank Mc Alinden <fmcalind@xxxxxxx>:
>
> > Hi Ade
> >             I think you only need two.......One for on / off and
the
> > other for direction changing...The direction relay would
> have to be a
> > double pole change over...If the direction relay  is off
> say and the on
> > / off is turned on then the device clamps, goes forward ,up or
> > whatever...If the direction relay is energised the device
> unclamps ,goes
> > rev ,down or whatever....Depending on what your using it
> for it might be
> > better ti have the on / off disabled when changing
> direction........I
> > can do a schematic and email it in pdf if you wish ??? Let me
know
> >
> > Frank
> >   ----- Original Message -----
> >   From: xslash@xxxxxxx
> >   To: ukha_d@xxxxxxx
> >   Sent: Tuesday, June 03, 2003 4:34 PM
> >   Subject: [ukha_d] reversing a 12v line - number of relays?
> >
> >
> >   Hi
> >
> >   I have an 12v actuator that to reverse its action needs
> the voltage
> > reversed.
> >   I'm going to be using comfort to drive relays to do this
> and as far as
> > i can
> >   see, i'll need 3 relays (1 to turn off/on the power, the
> other 2 to
> > reverse the
> >   12+ and gnd). Does this sound correct or is their an
> easier way to do
> > this?
> >
> >   thanks in advance
> >
> >   Ade
> >
> >
>
>
>
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