Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual - Manual (Page 302)

17.0 EASY-TUNE
The EASY-TUNE algorithm is used to help determine the optimal tuning values for the Proportional
Band (PB), Integral (TR), and Derivative (TD) parameters (called PID constants) of each Controller
Module 0 through 3 (CON0-3). The datapoints for these parameters are summarized in Table 17-1
as follows:
Table 17-1. Summary Information for Tuning Parameters
Abbr. Datapoint (CON0, 1, 2, 3) Min. Affect Max. Affect Parameter
P.B. C106, C142, C178, C214 1000% 2% Proportional Band
TR C107, C143, C179, C215 200 min./rep. 0.02 min./rep. Reset
TD C108, C144, C180, C216 0.01 minutes 8 minutes Rate
This section provides the necessary information to initiate the EASY-TUNE sequence, to identify
the EASY-TUNE parameters, to evaluate the return status indications, and to modify the tuning cri-
teria.
17.1 GENERAL CONSIDERATIONS
•
A controller functioning in a process as a pure integrator can not be tuned with EASY-TUNE,
as there is only one PID value which eliminates the possibility for controller self regulation.
•
For processes with slow variable changes, be sure the Process Variable is at a steady state
before initiating the EASY-TUNE sequence.
•
Disturbance to the process during the EASY-TUNE sequence may result in a false process
characterization.
•
In some applications, a process response may not be satisfactory approximation as a first or-
der time lag with gain and dead time.
17.2 INITIATING THE EASY-TUNE SEQUENCE
The EASY-TUNE algorithm is initiated when datapoint B008, Background Program, is set to 1.
Datapoint B385, Control Module Selector, must be set to the appropriate CON Module number for
the PID parameters being tuned (CON-0 = 0, CON-1 = 1, CON-2 = 2, and CON-3 = 3).
17.3 EASY-TUNE PARAMETERS
The EASY-TUNE parameters that must be configured to initiate the EASY-TUNE sequence are
items 1, 3, 4, and 5 through 10 in Table 17-2. If using the 53MC5000B controller, some of these
parameters also appear under the SYSTEM MODULE as shown in Table 5-15.
Section 17. EASY-TUNE
17-1