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Re: Once again Troll

Most commonly used analog servo control systems today are 0-5V, 1-5V, and 4 to 40 milliamps especially the PLC based systems. Often they are user switchable. Personally, I prefer 4-20 ma because there is no concern about voltage drop for long runs of control wire. Newer equipment is DDC (direct digital control.)

I think the actual VFDs still use triacs and quadracs just the way they always did.

If you do not have a good working theoretical and practical knowledge of feedback control systems, you cannot get a job as a controls engineer in the United States of America today.


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  • Re: Once again Troll - Soundmind 09:50:50 08/18/06 (0)


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