Can I disable the velocity control of 7344

[jimmyjimmy2000]

Since our servo driver has its own analogy closed velocity loop, we need to disable the velocity loop on 7344. How can I do this?
Thanks.

[Jochen]

It shouldn't be necessary to disable the velocity control of the 7344 and in fact it's not possible to do this. I have already worked wit some drives that provided their own velocity control loop in combination with the 7344 and didn't run into any problems. I guess that your drive interprets the analog signal of the 7344 as the velocity setpoint. The complete controller architecture is then a cascaded control loop and it's absolutely legitimate to do this.

Jochen Klier
Applications Engineering Group Leader
National Instruments Germany GMbH

[rcdon]

I'm doing exactly as Jochen suggests with a Kollmorgen Servostar 600 amplifier and it works perfectly. I did the servo tuning with MAX and have no problems. I use the emulated encoder output from the 600 as my feedback for the 7344.

Rod

[Ya-hoo]

In PCI7342 user manual, it is recommanded that use current loop in driver and velocity or position loop in controller. And it makes performance better in this way.
So any difference if we use current or velocity loop in driver and use velocity loop again in controller?

Thanks.