model 2704 controller installation and operation handbook - Soliton

Tuning
2704 Controller
8.3. TO AUTOTUNE CONTOL LOOP LP1
In most cases it will only be necessary to carry out the Autotune procedure when
commissioning your controller.
Do This
This Is The Display You
Should See
Additional Notes
Set the setpoint to the value at which you will normally operate the process .
1. From any display press
as many times as
necessary to access the
page header menu
Autotune page is at Level 3
by default, but may have
been promoted to L1 or L2.
2. Press or to
select ‘AUTOTUNE’
3. Press to display
sub-headers
4. Press or to
select ‘Autotune Loop’
5. Press to select the
parameter.
The choices are:-
LP1
LP1A
LP1 Cascade
These are repeated for
Loops 2 and 3
Note:
Text shown in italics is user
definable in configuration
mode and may be different
from that shown
6. Press or to
choose the loop to tune
1. The controller induces an oscillation in the PV by first turning the output (power) on, and
then off. The first cycle is not complete until the measured value has reached the required
setpoint.
2. After two cycles of oscillation the tuning is completed and the tuner switches itself off.
3. When the controller is autotuning the status of autotune is shown periodically on the
relevant loop summary
4. The controller then calculates the tuning parameters listed in Table 8-1 and resumes
normal control action.
If you want ‘Proportional only’, ‘PD’, or ‘PI’ control, you should set the Integral time
parameter or derivative time parameter to OFF before commencing the tuning cycle. These
parameters are found in the Loop Setup (PID) pages, see Chapter 9. The tuner will leave
them off and will not calculate a value for them.
8-4 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00