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4/00 UDC 3300 Controller Product Manual 275
Step Action
10
Enter the values of GAIN (or PB), RATE, and RESET in minutes (or repeats
per minute) into the UDC 3300 controller and verify that the PV response is
adequate.
Make additional trimming adjustments, if necessary, to fine tune the
controller per the guidelines shown below:
TO REDUCE OVERSHOOT
Less Gain (more PB) perhaps a longer Rate time.
TO INCREASE OVERSHOOT OR INCREASE SPEED OR RESPONSE
More Gain (less PB), perhaps shorter Rate time.
Manual tuning formulas
Table 11-2 lists the formulas used in the procedure listed in Table 11-1.
Table 11-2 Manual Tuning Formulas
Units
GAIN
and
RESET TIME in Minutes
Repeat
% PROPORTIONAL BAND
and
RESET ACTION in Repeats
Minutes
Proportional (P) only
Use PD+MR Algorithm
(i.e. No Reset)
GAIN = Measured Gain x 0.5
RESET TIME = 50.00
(minimum reset)
RATE = 0
%PB = Measured PB x 2
RESET ACTION = 0.02
(repeats/minute)
RATE = 0
Proportional + Reset
(PI) (No Rate)
GAIN = Measured Gain x 0.5
RESET TIME = Measured Time
(M/R) 1.2
RATE = 0
%PB = Measured PB x 2.2
RESET ACTION =
1.2
(R/M) Measured Time
RATE = 0
Proportional + Reset + Rate
(PID)
GAIN = Measured Gain x 0.6
RESET TIME = Measured Time
2
RATE = Measured Time
8
%PB = Measured PB x 1.7
RESET ACTION =
2
Measured Time
RATE = Measured Time
8