On Mon, 15 Jun 2009 14:10:32 -0400, Bob Engelhardt
wrote:

Ned Simmons wrote:
It'll work just fine for most any position or velocity control app,
including CNC. The encoder feedback returns to the controller. The
tach feedback is optional, and generally not necessary with a modern
controller and high line count encoders.

If there's no motion controller in the system and the goal is tight
speed regulation, then the tach feedback is useful.


By "controller", do you mean something other than this servo amp?
'Cause the amp doesn't have inputs for encoder feedback, just tach.


Yes, that amp by itself is essentially a high performance DC drive. By
motion controller (and what I gather Jon is calling an "interface") I
mean a general purpose programmable device that can monitor the
position and velocities of the various parts of a system and generate
the command voltage (the input to the amps) to coordinate a motion
routine.

--
Ned Simmons