A DPST will perform the function fine, unless you want DPDT for some other reason.
Roland On 6 April 2010 14:39, Erik Christiansen <dva...@internode.on.net> wrote: > On Mon, Apr 05, 2010 at 06:08:15PM +0200, Jan de Kruyf wrote: > > Hallo, > > The accepted wisdom with commutator d.c. servo motors was always to > > have a contactor break the motor wires and short the motor armature > > through a resistor. The shorting of the armature works as a brake to > > stop the motors reasonably quick. The resistor in series is needed so > > the armature shorting current does not become greater than the > > demagnetizing current of the permanent magnets. 2 or 3 times maximum > > stall current should be ok. > > I hadn't thought of that, and like it a lot. It's simple, and doesn't muck > with the power supply. It does though require a DPDT relay for each > motor, or an 8PDT relay for all four. Fortunately, I have a tube of 25A > DPDT relays in the junkbox. > > Choices. :-) > > Erik > > -- > An idealist is one who, on noticing that a rose smells better than a > cabbage, concludes that it will also make a better soup. -- H.L. Mencken > > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
