Manual: R1300-X-00-X_EN Release: 1.04 © Elotech GmbH Page 16/20
Display
Parameter
Display
"Process"
„Set“
OPt
self tuning
OFF
self tuning out of action
(autotune)
on
self tuning on request ( one time)
Auto
self tuning automatically if the controller is switched on
and if the difference between process value and
setpoint is > 7 % of the range.
The tuning algorithm determines the characteristic values within the controlled process, and calculates
the valid feedback parameters ( P,D,I ) and the cycle time ( C = 0.3 x D ) of a PD/I-controller for a
wide section of the range.
The determined parameters for heating are also adopted for cooling.
The self tuning activates during start-up shortly before the setpoint (Set) is reached. The setpoint must
amount to the least 5% of the total range.
If activated after the setpoint has already been reached, the temperature will first drop by approx. 5%
of the total range, in order to detect the exact amplification of the process.
The tuning algorithm can be activated at any time by selecting th
e OPT=on and pressing the „E“-key.
During self tuning „Opt“ is shown in the display, alternating with the setpoint value.
Using the heat-cool controller, the temperature drop will be accelerated by switching on the cooling
for a short duration.
After having calculated the correct feedback parameters, the controller will lead the process value
to the setpoint.
X
X
Set
Set
OPT on
t
OPT on
t
Self tune
Self tune, after the setpoint
during start-up
has already been reached
Self-
tuning can be stopped by selecting the option OPT = OFF and pressing the „E“ - key.
OFSt process value offset
-999 ... OFF ...1000 Units
(ex works: OFF)
-99,9 ... OFF ... 100,0
1)
-9,99 ... OFF ... 10,00
2)
This parameter serves to correct the input signal, e.g. for:
-
the correction of a gradient between the measuring point and the sensor tip,
-
the line resistance balancing of 2-line RTD (Pt100) sensors and
-
correction of the control devition when using P- or PD-action.
If for example the offset value is set to +5°C, then the real temperature measured by the
sensor (when process is balanced) is 5°C less than the setpoint and the displayed process value.
