Honeywell UDC2500 - Page 50

Configuration
36 UDC2500 Universal Digital Controller Product Manual 4/07
Function Prompt
Lower Display
Selection or Range of Setting
Upper Display
English Numeric
Code
English Numeric
Code
Parameter
Definition
Also defined as "HEAT" Rate on Duplex
models for variations of Heat/Cool
applications.
I MIN
or
I RPM
103
0.02 to 50.00
0.02 to 50.00
I MIN = Reset in Minutes per Repeat
I RPM = Reset in Repeats per Minute
Integral Time (or Reset) 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 CONTRL parameters
group under the prompt MINorRPM.
MANRST 104
-100 to 100 %
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.
PB 2 or
GAIN 2
105
PB = 0.1 to 1000 %
Gain = 0.01 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.
RATE2T 106
0.00 to 10.00
minutes
0.08 or less = OFF
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.