Re: coolant pump control questions -MPJA

Hi all,

Isn't a simple solid state relay the easiset solution ?

http://www.mpja.com/allpict.asp?dept=315

The selection is for AC voltages ONLY, not for switching DC
voltages. most have a low control voltage of 3-5 VDC.

Just make sure the 5VDC signal and ground are from the exact same
power supply.

For about $30.00 bux, you're home free. that is the $20.00 minimum
charge and $5.00 shipping and the other neat stuff yo umight want !

Dave








--- In CAD_CAM_EDM_DRO@yahoogroups.com, "markpowerplus <mabw@b...>"
<mabw@b...> wrote:

>
>
> 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