Autotune
AUTOTUNE
Select the most appropriate method of Autotune , Tune or
Tune at Setpoint, to suit the application.
Note: The proportional cycle-time can be pre-selected
before starting Autotune, see PROPORTIONAL
CYCLE-TIME.
The TUNE program should be run with the load cool. The
output is cycled at 75% of the setpoint value to avoid any
overshoot during the tuning cycle. The warm-up
characteristics are monitored and set DAC which minimises
overshoot on subsequent warm-ups.
The TUNE AT SETPOINT program is recommended:
when the setpoint is below 100°C/200°F, where
TUNE’s tuning cycle at 75% setpoint may be too
close to ambient to produce good results;
when the process is already hot and the cooling
rate is slow;
when controlling multi-zone or heat-cool
applications;
to re-tune if the setpoint is changed substantially
from previous Autotune.
Note: dAC is not re-tuned by TUNE AT SETPOINT.
TUNE PROGRAM
Enter program mode and select TUNE
The controller will alternately display TUNE and
oFF
.
Press and hold ✱ and press ▲ once,
The controller will alternately display TUNE and
on
.
Exit program mode.
The TUNE program will now start. The controller will
alternately display TUNE and the process temperature
as it climbs to setpoint.
Note: During tuning, the main setpoint (SP1) LED will flash.
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