Re: [CAD_CAM_EDM_DRO] Re: coolant pump control questions

Most solid state relays will work from 3 to at least 12 many higher. If you
cooling system
is 110vac then the reed relay would not drive it anyway. If you check
www.jameco.com
search for 139053 part#. It is a 240D25 relay up to 240vac and 25 amps
operates from 3 to 32 volts. It doesn't list the drive current but I would
recommend that you use a transistor to drive it with. Put a 1k resistor in
series with the driving pin and the base of the transistor. wire the emitter
to ground and the collector to the - pin on the relay and the + pin to 5v.
This is assuming you have 5v available.
Hope this helps.
Jim

----- Original Message -----
From: <mabw@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, January 28, 2003 11:12 PM
Subject: [CAD_CAM_EDM_DRO] 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
>
>
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