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26 UDC3200 Universal Digital Controller Operator Manual 04/08
3.3 Tuning Set Up Group
Function
Prompt
Lower Display
Selections or
Range of Setting
Upper Display
Parameter Definition
PROP BD
or
GAIN
0.1 to 9999 %
or
0.001 to 1000
PROPORTIONAL BAND (simplex) is the percent of the range of
the measured variable for which a proportional controller will
produce a 100 % change in its output.
GAIN is the ratio of output change (%) over the measured variable
change (%) that caused it.
G = 100 / %PB where PB is the proportional band(in %)
If the PB is 20 %, then the Gain is 5. And, at those settings, a 3 %
change in the error signal (SP-PV) will result in a 15 % change in
the controller's output due to proportional action. If the Gain is 2,
then the PB is 50 %.
Also defined as "HEAT" Gain on Duplex models for variations of
Heat/Cool applications.
The selection of Proportional Band or Gain is made in the
CONTROL parameter group under prompt PBorGAIN.
RATE MIN
0.00 to 10.00
minutes
RATE action, in minutes, affects the controller's output whenever
the deviation is changing; and affects it more when the deviation is
changing faster.
RSET MIN
or
RSET RPM
0.02 to 50.00
RSET MIN = Reset in Minutes per Repeat
RSET RPM = Reset in Repeats per Minute
RESET (or Integral Time) adjusts the controller's output in
accordance with both the size of the deviation (SP–PV) and the
time that it lasts. The amount of the corrective action depends on
the value of Gain. The Reset adjustment is measured as how many
times proportional action is repeated per minute or how many
minutes before one repeat of the proportional action occurs.
Used with control algorithm PID-A or PID-B.
Also defined as "HEAT" Reset on Duplex models for variations of
Heat/Cool applications.
ATTENTION The selection of whether Minutes per Repeat or
Repeats per Minute is used is made in the CONTROL parameters
group under the prompt MINorRPM.
MAN RSET
–100 to +100
(in % output)
MANUAL RESET is only applicable if you use control algorithm PD
WITH MANUAL RESET in the Algorithm Set Up group. Because a
proportional controller will not necessarily line out at setpoint, there
will be a deviation (offset) from setpoint. This eliminates the offset
and lets the PV line out at setpoint.
ATTENTION Bias is shown on the lower display.
PROPBD2
or
GAIN 2
0.1 to 9999 %
or
0.001 to 1000
PROPORTIONAL BAND 2 or GAIN 2, RATE 2, and RESET 2
parameters are the same as previously described for “Heat” except
that they refer to the cool zone tuning constants on duplex models
or the second set of PID constants, whichever is pertinent.
RATE2MIN
0.00 to 10.00
minutes
This is the same as above except that it applies to Duplex models
for the "COOL" zone of Heat/Cool applications or for the second
set of PID constants.