Re: [CAD_CAM_EDM_DRO] Re: coolant pump control questions -MPJA

Dave,
The SSR is the easiest way to go, although there are 2 problems; first
you can't buy 1 at the local 7-11 of electronics (RAT SLOCK), 2 MJPA has
so much NEAT JUNQUE that I'd have a hard time limiting my self to just
buying $15.00 of other stuff 8-))
Bill Higdon
turbulatordude wrote:

> 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
>>>