Re: Limit Switch Installation

OK--but what happens if EMC decides pi is a rational number?

--- In CAD_CAM_EDM_DRO@egroups.com, "Wally K" <cnc4me@u...> wrote:
> Limit switches are supposed to be wired to control inputs. If
using
> EMC they should go to the parallel port. If your motor control has
> limit switch inputs and you want to use them they will also be
logic
> inputs. But if you use the inputs on the controllor and not EMC
then
> EMC will not know what is going on. Motor controlor inputs should
be
> used as a secondary fail safe only.
>
> Logic inputs only take a few milliamps to trip usually at 5
volts.
> EMC is configuarable for N.O. or N.C. inputs.
>
> Wally K.
>
>
>
> In CAD_CAM_EDM_DRO@egroups.com, jmw@c... wrote:
> > Are limit switches typically wired in series (normally closed)
in
> > the (PMDC) axis motor power circuit.
> >
> > I would assume so with this type of motor since the switch should
> > stop the motor in case all other safeguards (software, etc) fail.
> >
> > But a switch rated for 15AMPS 90VDC is going to be the size of a
> shoe
> > box? What up? Do people just run the cigarette-pack-sized
switches
> > (e.g. 24VDC 1AMP) and hope they don't trip em very often?
> >
> > Thanks.
> >
> > --Jack