Bruce, Going back to my collection of servo amp manuals, I find I have a schematic of the input section of a Westamp A651. It does not have an instrumentation amp on the command input. So, polarity of the signals is important. The command input "SIG" is on J1 Pin 2. The signal common, for tach, command and anything else is J1 Pin 4. J1 Pin 4 needs to be connected to the ground of the DAC board. This is the side facing AWAY from the label that says "Quad 16-bit DAC...." or the left with the component side of the board up.
If you find you have these wires backward, you will need to change the sign of the ini parameter OUTPUT_SCALE to prevent the servo from running away. If the connections are right, then I'd suggest running a big ground wire from the servo amp chassis to the PPMC. It appears these amps use an isolated magnetic current sensor, so motor currents should not be common to the control common. Jon ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
