TC33 Quick PID Setup Reference
5.5 PID MANUAL TUNING
Table 2 - Suggestions for manual tuning of PID parameters
Key and Display Functions
PARAMETER RESPONSE SOLUTION
Proportional Band Slow Response Decrease
Proportional Band Large Oscillation Increase
Integral Rate Slow Response Increase
Integral Rate Large Oscillation Decrease
Derivative Time
Slow Response or Instability
Off (
Dt=
0
)
Derivative Time Large Oscillation Increase
A2
A1
SET
UP
AT
PV display:
Indicates the
process temperature, program
parameters, sensor errors.
SV display:
Indicates the
setpoint, program parameter
values, and alarm codes.
AT Led:
Indicates that the
controller is in AutoTune mode.
A2 Led:
Indicates the status
of alarm 2.
A1 Led:
Indicates the status
of alarm 1.
C Led:
Indicates that the
Control Output is energized.
SET UP:
Used to move
forward through a menu Cycle.
Used to advance to the next
Cycle when pressed and held
for 4 seconds.
:
Used to increase the value
of the displayed parameter.
:
Used to decrease the value
of the displayed parameter.
The operator may choose to tune the controller manually for optimum process
performance once all parameters are set. This can be achieved by using Table 2
or by determining the values for the proportional band
pb
, integral rate
IR,
and
derivative time
dt
. The procedure below should only be implemented on
processes that will not be damaged by large fluctuations in the process
variable.
Step 1. Disable all outputs in Cycle-1 by changing rvn
to
0
. Change the setpoint
to the desired process variable (PV) in the Operation Cycle. This value should be
below (PV) if overshoot will cause damage to the process.
Set Up Cycle Parameter Access
Step 2. Make sure pb
is set to
0
in Cycle-2, page 13. This places the controller in
ON/OFF control.
Step 3. Enable all outputs by changing rvn
to
1
in Cycle-1. Once the outputs are
enabled the process variable (PV) will approach and eventually overshoot the
setpoint (SV). At this point the operator should note the following values (see
Figure 10):
• The value from the highest point of overshoot to the lowest point of
undershoot, X.
• The cycle time of the oscillation, T.
Using the following information and the values above the operator can determine
the PID setting for the process:
• Pb
= X
÷
scale range x 100
•
Ir
= T = cycle repetitions per
minute
•
Dt
= T
÷
6
PV
tim e
SV
X
T
19
TC33 Quick Set UP
This quick reference setup is intended to be used by experienced users that are
familiar with the TC33 set up menu or those that only need basic PID operation.
This guide will show how to configure the input, output control and basic alarm
function. For Detailed programming information refer to the Table of Contents to
find the required instructions for a particular function. Follow these steps below:
(Figure 10)
18
(30 pages)
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