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Thanks for your responses. It's a great help. Now my next question is, what does the NEC or other international Codes say about SDSs? Are there some rules? Thanks.

Hi itsmoked, Yes definitely you can move to a converging offset algorithm. Talking about PID, you can still use PID even if your setpoint changes every 80ms. If your PID is tuned properly, it will be able to handle your problem. It think one of the problems know is how will you tune your PID...

I agree with controlnovice. There are many resources around you. The only thing you need to do is ask them and read magazines, texts, and even the manuals of the systems you're currently handling. That is why eng-tips is here....to help you =) You're just one text message away.

I use Microsoft Visio

FrankWz, based on the simulation result you attached, it seems to be that the PID is not just tuned properly. Simple tuning methods like Ziegler-Nichols and its variants may not be good for your application. There more than 2000 tuning methods available and it's difficult to find one that would...

If the formula given by djs doesn't work, it doesn't mean that the PID controller will not work. It may mean that the tuning method is na usable for your system. And if this would happen, then it would seem to me that your system is not first order and has a severe nonlinearity problem which...

Can anyone here explain the concept/theory of separately derived systems and how it would affect system installations? Thanks.

The ISO quality system is something that could be used for marketing purposes especially that a lot of people don't know the details about it. Yes, it may have a small value for us quality professionals, but we should take this as a challenge to help us and our companies improve not only our...

What does the NEC say about putting a high-voltage sticker? What is the minimum amount of voltage in which a sticker must be placed? It is also required to put the value of voltage near the lightning sign? Thanks.