Instruction Manual
Microprocessor Temperature Regulator HT MC11
Page 17 of 22
Autotune:
The tuning algorithm determines characteristic values within the controlled process
and calculates valid feedback parameters (P, D, I) and cycle time (= 0.3 x D) for a PD/I-
controller.
The autotune mode is activated during start-up shortly before the setpoint is reached.
If autotune is activated after the setpoint has already been reached, the temperature
will first fall approx. 5 % below the measuring range in order to determine optimal
control system parameters.
Autotune can be initiated any time by setting
OPt
=
on
.
After finishing calculation of feedback parameters, the controller leads the process
value to the setpoint value.
Autotune can be stopped by setting
OPt
=
OFF
.
During autotune the display shows
OPt
alternating with the setpoint value.
Preconditions for starting the autotune algorithm:
•
Setpoint value must be higher than 5 % of measuring range
•
Sensor must not have a failure
•
Softstart function must not be active
OPt
autotune
OFF
autotune not active
on
autotune active (one time)
Auto
Autotune starts each time the controller is turned on if
the difference between setpoint and actual process
value is more than 7 % of the measuring range.
OFSt
process value Offset
-999
OFF
1000
Parameter for correction of input signal:
•
correction of a gradient between measuring point and sensor
tip
•
line resistance balancing of 2-line RTD (Pt100) sensors
•
correction of control deviation when using P or PD action
Example: if the offset value is set to +5 °C, the real temperature
measured by the sensor (when process is balanced) is 5 °C less
than the setpoint and the displayed actual process value.
Ensure that the corrected temperature process value is within
the selected measuring range.
Version 1080/1.03 02/2018
471 11 400
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