Source control logic vs. Sink control logic?

From: pwk@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx (PaulKraemer)
Date: Fri, 19 Aug 2005 11:35:19 -0500

Hi,

I have been reading some manuals for different AC and DC drives. All
of them seem to always have digital inputs which you use to
start/stop the drive. From what I gather, it seems that these drives
either use "Source Control Logic" or "Sink Control Logic" for these
inputs. I have been reading a few electronics books, but I don't
really understand these concepts. If anyone could give me a brief
explanation, or point me towards something else I can read, I would
really appreciate it.

thanks
Paul :?:

.

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