RE: [CAD_CAM_EDM_DRO] Solid State Relays for AUX control

Hi

www.digikey.com is a great place to get most anything electronic.

Most relays that are zero crossing are AC only (IE: Triac based). So if you are
trying to switch a DC source the AC type SSR will turn it on but not turn it off.

You will find that SSR are typically very expensive relative to there mechanical
counter parts.

On the other hand it takes quite a bit more to drive a mechanical relay, so it a
trade off.

For most low load needs a mechanical relay will do the job fine.
Note: Put a small .1uf (500v) capacitor across the load leads to minimize
arcing on the contacts.

Good luck.
Mark




-----Original Message-----
From: Egroupscdh (E-mail) [mailto:egroupscdh@...]
Sent: Friday, October 31, 2003 6:44 AM
To: CAD_CAM (E-mail)
Subject: [CAD_CAM_EDM_DRO] Solid State Relays for AUX control


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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