PID, APC

Advanced process controls (APC) refers to a sophisticated and growing collection of algorithms (software) applied used in logic devices for making continous, batch or hybrid operations. Examples include proportional-integral-derivative (PID) software.

Figure 1: PID controller gain response to white noise. Tuning constants are K = 1.0, Ti = 0 repeats/minute, Td = 0 minutes. White noise limited to +/- 5%. Parallel PID control algorithm. Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 21: Noise: Can I tune around it?

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Figure 2: Simplified open loop IMC PI tuning of a self-limiting process. Tuning constants are K = 1.26, Ti = 1.59 minutes/repeat, Td = 0 minutes. Control valve sticks 5% with no slip. Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 20: How to tune with sticking control valves

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PID, APC Continued

Figure 2: Air blower discharge pressure limited by plugged filter. Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 19: PID controller tuning best practices

Figure 4: PID pressure/temperature controller with bad valve. Tuning constants are K = 0.8, Ti = 1.0 minutes/repeat, Td = 0.25 minutes. Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 18: How to spot sticking control valves

PID spotlight, part 17: Heuristic tuning of integrating processes

APC 2.0 spotlight, part 2: Base-layer advanced process control

Courtesy: WTWH Media

PID spotlight, part 16: Closed loop tuning of an integrating process

APC 2.0 spotlight, part 1: What is APC 2.0?

Table 1: Lambda integrating process PI tuning constant calculations for proportional-integral (PI) controllers. Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 15: Open loop tuning of near integrating process

Courtesy: Ed Bullerdiek, retired control engineer

PID spotlight, part 14: How open loop tuning works in an integrating process

How to tune a PID controller

PID spotlight, part 13: Deadtime: What’s the best that I can do?