Micromod Micro-DCI: 53SL5100B Single Loop Controller Manual de usuario descargar pdf (Pagina 81)

53SL5100B Single-Loop Controller

INSTRUCTION MANUAL

11 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) in the Controller Module Mode 0

(CON-0). The three parameter datapoints are C106, Proportional Band (PB); C107, Reset Time (TR); and

C108, Derivative Time (TD).

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 criteria.

11.1 General Considerations

An instrument functioning in a process as a pure integrator can not be tuned with EASY-TUNE, as there is

only one instrument value which eliminates the ability for instrument 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.

Feed Forward control is not allowed during the EASY-TUNE sequence. In some applications, a process

response may not be satisfactorily approximated as a first order time lag with gain and dead time.

If the ratio of process Dead Time (W

P) and Process Time Constant (TP) is greater than 0.5, datapoint B386

should be set to 3 for PID Control Mode.

11.2 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 checked to ensure it is at its default value of 0 for CON-0.

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Micromod Micro-DCI: 53SL5100B Single Loop Controller Manual de usuario Pagina 81