Hi archangel,
You can try using the plain PID.vi for your application. There are a few examples on how to use the PID block. (Help - Find Examples - Toolkits and Modules - PID Control - PID).
I am attaching one of them in this post. There is a plant simulator block that would be your power supply in your case. Notice the output range of the PID block is not wired, it is using the default -100 to 100, you can adjust this to the way you are interfacing your power supply. Many applications use 0-100 output range which represents percentage, say the opening of a valve, a PMW signal, etc. You can see that output as the green line on the graph.
I guess you already have the PID user manual. Just in case, here is the link.
I hope this helps,
Pablo Bernal
Applications Engineer Mexico
