DAC output setting

Dear All,

I am using the product PBC4-G21-000-A000000 to drive a SERVO motor via an external driver. The driver requires Single Ended DAC output wiring. I am facing the problem that my motor only moves in one direction. I checked the DAC output and figured that it only outputs positive voltages. I am probably missing something in the motor setup. Can I get some input on how to debug/fix this issue?

Thank you,

Chanaka

Hi All,

I did few checks and found few issues.

1. Incremental encoder count sign is swapped between the external driver and Power PMAC position read back. I fixed this by swapping the phases. I found the relevant software fix for this. However, for now, I fixed the issue by swapping the cabling.

2. I then tried OPEN LOOP commands.

- #1out1 : This gave me a full -10V output

- #1out-4 : This gives me the full +10V output

Now I need to swap the polarity and fix the scaling such that #1out100 should give me a +10V and vice-versa.

I believe this polarity issue is affecting my JOG. Can someone point me to the functions to accomplish those (polarity + scale) changes?

Thanks,

Chanaka

This should be straightforward when you set the PowerBrick[].chan[].OutputMode correctly, your output is then limited by Motor[].MaxDac.

Have you followed the procedure on page 152 of the manual?

Thanks Richard. Open loop is now good. I was cloning from a working example and did not check in the manuals for DAC specific information.

- Chanaka