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VersaPro Temperature Controller Page 42

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SET PB = 30

RESET = .01

RATE = .01

SETPT = TYPICAL

INCREASE PB BY

30%

CHANGE SETPOINT

BY 5%

IS CONTROL

STABLE?

RESET X 2

STABLE

CHANGE SETPOINT

BY 5%

A

A

ALLOW SYSTEM TO

STABILIZE

HOW IS SYSTEM

REACTING?

BELOW SETPOINT

RESET X 2

OSCILLATING

CHANGE SETPOINT

BY 5% AND ALLOW

STABILIZATION

RESET / 2

STABLE

B

B

OVERSHOOT

ACCEPTABLE AND

STABLE?

OVERSHOOT TOO HIGH

RATE X 2

TUNING FINISHED

OSCILLATING

RATE / 2

YES

RECORD PID

VALUES

ALLOW PROCESS TO

STABILIZE

OSCILLATING

DECREASE PB BY

10%

START RESET

PROCEDURE HERE.

START PROPORTIONAL

BAND PROCEDURE

HERE. THESE SETTINGS

ASSUME THE SYSTEM IS

STABLE WITH A PB OF

30. KEEP INCREASING

PB BY 50% IF

OSCILLATING.

START RATE

PROCEDURE HERE.

Figure 9 PID Tuning Procedure

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 78 79

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