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 = o n .
After finishing calculation of feedback parameters, the controller leads the process
value to the setpoint value.
Autotune can be stopped by setting OPt = OF F.
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
OP t
autotune
OF F autotune not active
on autotune active (one time)
Au t o
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.
OF S t
process value Offset
-999 … OF F … 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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