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Control Output Ramp

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Haycord

Industrial
Mar 19, 2003
5
I have a compressor with a recycle valve between suction and dischg (700-950psi). When the unit goes on-line it must not take the dischg pressure up at greater than 40 psi/minute. The Gov control is another issue, but regarding the valve: what is the best way to control the rate? Simple enough to put a dischg pressure setpoint in the valve but typical PI tuning may get out-of-bounds when conditions are different.

Control system is PLC5/30 with 6200. Is there a method to monitor the rate-of-change and auto-adjust the PID accordingly, or is there another way? Is it possible to set "window limits" to prevent the rate-of-change from getting outside and causing problems. I'm not really a proficient programmer but I know what I want the control system to do. I will seek outside help on the actual program. Best regards.
 
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