Specifications

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