Connecting Mesa 7i83 for analog control of a servo.

[rcheli]

I'm trying to control a DYN4 1.8kw servo being used as a spindle motor via analog -+10v. I have a Mesa 5i25+7i76+7i83 running under LinuxCNC. I have 24v field power connected to the 7i83 and I have this connection in the HAL and I and see the value on the hm2_5i25.0.7i83.0.1.analogout0 pin the HAL watch but I am not measuring any voltage above .3mv on the AGND and AOUT pins (3 & 4).

net spindle-output => hm2_5i25.0.7i83.0.1.analogout0

I thought all I would need to do is to hook the 7i83 AGND to the DYN4 AIN- and the 7i83 AOUT to the DYN4 AIN+. But before I actually made the connection I thought I would check the voltage and I'm not reading anything. Any ideas?

Thanks
John

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[rcheli]

I made a little progress. I had to set the ENA+ high and now I get a fixed 10v. I think this is looking more like a software setup issue.

[rcheli]

Making more progress. I changed the HAL entry to this:
net spindle-vel-cmd-rps => hm2_5i25.0.7i83.0.1.analogout0

I now get variable voltage values both positive and negative although the step seem a bit course. I think I'm on the right track now.