IEC Fusion Technology: A New Look At PID Loops

Tuesday, October 6, 2009

A New Look At PID Loops

My latest at ECN Magazine.

4 comments:

kurt9 said...: You ever used Eurotherm's 818 loop controllers?

I've used them in semiconductor applications where I needed temperature control of 0.1degC resolution.

Yokogawa's "green" series are a nice cheap loop controller as well. They're not as accurate as Eurotherm's but are very cheap and easy to interface them with your PLC or control PC.; October 7, 2009 at 3:04:00 AM GMT+1
M. Simon said...: Kurt9,

No. As I recall though most temp. controllers are based on the Gain/Time factors the chemical folks use.; October 7, 2009 at 6:06:00 AM GMT+1
kurt9 said...: Yes, they are. Nonetheless, they work quite well once they are properly tuned.; October 12, 2009 at 3:51:00 AM GMT+1
M. Simon said...: Kurt. I think that was my point. That Gain/Time tuning is more physical.

When I dis my original work on auto-tuning I looked at a number of temp. controllers in order to get a handle on the algorithms they used. Not much help.

What I found the most useful was a book on control theory from one of the engineering societies which had a number of fundamental papers including Ziegler-Nichols and some of the initial papers on "shock" tuning. I wish I could remember which society. Might have been the Society Of Chemical Engineers.; October 12, 2009 at 9:45:00 AM GMT+1

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