Re: coolant pump control questions

Yes , the problem I have is the control side of things, I don't know
the range of the PC . By "switching" on the coolant in the software I
get a 5 volt reading on pin 1 of the parallel port but it will not
switch the relay which is a 5 volt 10 ma. When I connect the relay to
pin 1 and the other side to earth the volts drop off to almost zero I
am guessing here at saying there is not enough current? this is the
smallest rated relay I could find (it is a reed relay) I could not
find a solid state relay in 5 volts.
help please!!!!!!!!
thanks
Mark
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude
<davemucha@j...>" <davemucha@j...> wrote:

> Hi MArk,
>
> Not sure if I understand yoru question fully.
>
> relay must be sized to or above the motor volts and amps. should

be

> just that simple. 1hp motor, you need to get a relay that can

handle

> a 1hp load, not just any 10 map relay.
>
> Relays are usually rated for Amps DC, Amps AC, and Inductive loads

or

> in hp.
>
> If you are asking about the control wiring of the relay, just look
> for a solid state relay in the 5 volt range of the PC, if you are
> driving from a PC.
>
> if you cannot find a realy with a good fit, you may considder using

a

> mini 1/4 amp relay and allow that to drive the coil of a larger

relay.

>
> Dave
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "markpowerplus <mabw@b...>"
> <mabw@b...> wrote:
> > Hi Guys!,
> > How do I set up the coolant pump on my 4 axis cnc mill? I am

using

> > cncpro. Do I use pin 1 and an earth to a relay switching power to
> the
> > pump? If so what would be a suitable relay specification wise re
> > volts and current for the relay? If not ,how? I know how to do

the

> > software side of things just not the physical side of it.
> > thanks
> > Mark