Re: [CAD_CAM_EDM_DRO] Solid State Relays for AUX control

Hi Chuck;

Its pretty hard to reccommend a specifc relay as there are anumber of
considerations to take into account. One good source, for a very
large number of SSRs, is Newark Electronics. It is also a good idea
to checkout your local electronics / industrial automation supply houses.

NOt all SSR's are zero croussing so do keep that in mind.
Personally; for things like coollant and other motor loads, you would
probally be just as well off to go with a mechanical relay. If the
motor is of any size at all you really should have a motor starter
installed. The NEC will define exactly when and where a motor starter
is required.

As far as all of the other loads it is a mixed bag. For marginal
loads, it is hard to beat the OPTO 22 format for flexiablity, on the
other hand PC Boards with a bunch of optical isolators can be much
cheaper if your working with only one driven voltage.

Thanks
dave



Egroupscdh (E-mail) wrote:

>Can anyone recommend a source for inexpensive (but reasonable quality) Solid
>State Relays (SSR) to use between the Ahha driver box and things like
>coolant, etc?
>
>Is there a real difference between these SSRs? I.e.: Do all of them do
>their switching at the zero crossover to minimize noise? Is this a real
>concern? All of my components (PC, Ahha driver box, VFD, etc. will be
>mounted in the rear cabinet of a Bridgeport Series I conversion.
>
>Cheers,
>
>Chuck Hackett
>"Good judgment comes from experience, experience comes from bad judgment"
>7.5" gauge Union Pacific Northern (4-8-4) 844
>http://www.WhiteTrout.net/Chuck
>
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