DCP200 Profile Controller & Recorder - Product Manual

11 Manually Tuning Controllers

Single Control Tuning (PID with Primary Output only)

This technique balances the need to reach setpoint quickly, with the wish to limit setpoint overshoot at start-up or during process changes. It determines values for the Primary Proportional Band and the Integral and Derivative time constants that allow the PID control algorithm to give acceptable results in most applications that use a single control device.

CAUTION:

This technique is suitable only for processes that are not harmed by large fluctuations in the process variable.

1.Check that the Setpoint Upper Limit and Setpoint Lower Limit are set to safe levels for your process. Adjust if required.

2.Set the Setpoint to the normal operating value for the process (or to a lower value if overshoots beyond this value might cause damage).

3.Select On-Off control (i.e. set the Primary Proportional Band to zero).

4.Switch on the process. The process variable will oscillate about the setpoint. Record the Peak-to-Peak variation (P) of the first cycle (i.e. the difference between the highest value of the first overshoot and the lowest value of the first undershoot), and the time period of the oscillation (T) in minutes. See the example diagram below - Manually Tuning PID.

5.Calculate the PID control parameters using the formula below. P.Pb is the Primary Proportional Band, Int.T is the Integral Time Constant, and Der.T is the Derivative Time Constant. The Input Span is the difference between Scale Range Lower Limit and Scale Range Upper Limit:

 

 

 

P

P.Pb =

 

 

 

x 100

Input Span

Int.T =

T minutes

 

 

 

T

Der.T =

 

 

minutes

6

 

 

 

 

Process Variable

Time

Figure 47. Manually Tuning PID

Page 74

Manual Tuning

51-52-25-150, Issue 1 – April 2009

Page 74
Image 74
Honeywell DCP200 Manually Tuning Controllers, Single Control Tuning PID with Primary Output only, 100, Input Span, Minutes

DCP200 specifications

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