Dwyer 32A - Manual (Page 22)

Page 22
tunE Tuning Choice: Select SELF, Pid, SLO, nor, or FASt.
SELF
The Controller will evaluate the Process and select the PID values to maintain good
control. Active for SP1 only.
LErn Select YES or no
YES
Start Learning the Process. After the
process has been learned the menu item
will revert to no.
no Learning will stay in present mode.
dFAC Damping factor, Select OFF, 1 to 7. Sets the ratio of Rate to Reset for the
SELF tunE mode. 7 = most Rate. Factory set to 3. For a fast response
process the value should be lowered (less Rate). For a slower process
the value should be increased (more Rate).
Pid Manually adjust the PID values. PID control consists of three basic parameters,
Proportional Band (Gain), Reset Time (Integral), and Rate Time (Derivative).
Pb1 Proportional Band (Bandwidth). Select 1 to 9999 °F, °C, or counts.
Pb2 Proportional Band (Bandwidth). Select 1 to 9999 °F, °C, or counts.
Appears only if control is equipped with second set point and Out2 is NOT
selected as ONOF.
rES Automatic Reset Time. Select OFF, 0.1 to 99.9 minutes.
Select OFF to switch to OFS.
OFS Manual Offset Correction Select OFF, 0.1 to 99.9%.
Select OFF to switch to rES.
rtE Rate Time. Select OFF, 0.01 to 99.99 minutes, Derivative.
SLO PID values are preset for a slow response process.
nor PID values are preset for a normal response process.
FASt PID values are preset for a fast response process.
Pid2 Linkage of PID parameters between SP1 and SP2: Select On or OFF.
On
Applies SP1 rEs, rtE, Fbnd, and FrtE terms to SP2 for heat/cool applications.
OFF SP2 functions without rEs, rtE, Fbnd and FrtE.
Does not appear if not equipped with second output or if second output is
programmed as alarm.
ArUP Anti- Reset Windup Feature: Select On or OFF.
On
When ArUP is On the accumulated Reset Offset value will be cleared to 0% when
the process input is not within the Proportional Band.
OFF When ArUP is OFF, the accumulated Reset Offset Value is retained in memory
when the process input is not within the Proportional Band.
ArtE Approach Rate Time: Select OFF, 0.01 to 99.99 minutes. The function defines the amount
of Rate applied when the input is outside of the Proportional Band. The ArtE time and the rtE
time are independent and have no effect on each other. To increase damping effect and
reduce overshoot set the approach rate time for a value greater than the natural rise time of
the process (natural rise time = process value time to set point).
Fint Fuzzy Logic Intensity: Select 0 to 100%. 0% is OFF (disables Fuzzy Logic). The function
defines the amount of impact Fuzzy Logic will have on the output. If Fint is set to 0, Fbnd
and Frte below will not appear.
Fbnd Fuzzy Logic Error Band: Select 0 to 4000 °F, °C, or counts. Sets the band width of the
Fuzzy Logic. Set Fbnd equal to PID proportional band (Pb1) for best results. Will not
appear if Fint is OFF.