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The calibration process runs through the following steps:
3.2.1. Initialisation:
During the initialisation stage, the PIREG-D2 identifies the data necessary for cali-
bration. In addition, it checks the selected temperature coefficient for dynamics and continuity within the
selected temperature range. Should the dynamics and continuity exceed the permitted limits, the
PIREG-D2 will stop the calibration procedure with Error 133 (parameter error).
3.2.2. Calibrate input amplifier:
The input amplifiers for Ur and Ir are adjusted in steps to the voltage
and current at the heating conductor. In the first step, the required modulation reserve for the sealing
transformer/heating conductor combination is determined automatically (from V1.00/1.23/1.30/1.25).
In this calibration step, the actual value display shows different values every second and the actual value
output is charged with different voltages every second. The measured current or voltage value is dis-
played or issued alternately.
With the actual value being shown on the display, the current value is shown in the controller's 0-50% set
temperature range and the voltage value is shown in the 50-100% range. The zero point of the displayed
values is set at 50 %. At the beginning of the calibration, the amplifiers (for Ur and Ir) are initiallised with
minimum amplification. At the end of the calibration procedure, if the adjustment has been made success-
fully, the range for the displayed current value is from 16-33% and the range for the measured voltage
value is from 66–83%. The current value is displayed accordingly in the 0-5V range at the actual value
output and the voltage is displayed in the 5-10 V range. The measurements' zero point is around 5V. The
amplifiers (for Ur and Ir) are initialised with minimum amplification at the start of the calibration process.
At the end of the calibration procedure, if the adjustment has been made successfully, the range for the
displayed current value is from 1.66 - 3.33 V and the range for the displayed voltage value is from 6.66 -
8.33 V.
3.2.3. Determining the phase shift:
During this step, the phase shifts between Ur and Ir, caused by the
transformer, are measured and corrected. The controller automatically sets the optimum scan times for Ur
and Ir. The actual value display and the actual value output show the phase shift. A display of approx.
50% of the controller's set temperature range or a signal of approx. 5V corresponds to the optimal value.
3.2.4. Determine reference resistance:
The reference resistance of the heat conductor (Rref) is deter-
mined in this step. A reference temperature of 0-50°C must be set in the controller (
5.7.2.), for the cali-
bration process. During calibration, the heat conductor must be at the reference temperature to ensure
that regulation is exact. By standardizing the voltage signal (Ur) and the current signal (Ir), the reference
resistance for the different temperature coefficients is always within the same resistance range. If 20 °C
has been selected as the reference temperature, then heat conductor's R20 is directly determined as the
reference resistance. If a heat conductor temperature other than 20 °C has been selected for calibration,
then the determined reference resistance corresponds to the temperature coefficients above or below the
value for the R20. The reference resistance is displayed for one second at calibration stage 4 as an actu-
al value and at the actual value output. At a reference temperature of 20°C, 70%-80% of the set tempera-
ture range is displayed as an actual value or the actual value output voltage amounts to 7-8V. For the
entire range of the reference temperature of 0-50°C the actual value display is within a range of 60%-
100% and the voltage at the actual value output is within a range of 6-10V.
3.2.5. Temperature comparison time:
(
5.7.3.) The aim of the temperature reference time is to ensure
that the reference resistance can only be detemined when the heat conductor has completely cooled
down. During the comparison period, the actual value display goes down to from 100% to 0% of the con-
troller's set temperature range. During this reference time, the signal at the actual value output declines
from 10 V to 0 V. Times of 15 or 30 s can be chosen for the temperature reference time.
3.2.6. Check reference resistance:
Here the reference resistance is checked after the temperature
comparison period has expired. If calibration takes place on a heat conductor that has cooled down still
further during the course of the temperature reference time, the entire calibration will be discarded and
the procedure automatically restarted. Once the reference resistance has been successfully checked
from the set reference temperature, the temperature coefficient selected and the calculated reference
resistance, the PIREG-D2 calculates the heat conductor’s R20 (resistance at 20°C).
The reference resistance measured is displayed for one second at the actual value output. The same
voltage set at the actual value output as when the reference resistance was determined (
3.2.4).
3.2.7. Determine the P-factor:
The P-factor of the sealing transformer/heat conductor combination is
determined by specific heating at a constant actuating variable. The heat conductor is either warmed by a
maximum of approx. 60 K or charged for a maximum of 120 network periods with a defined control value.
The total amplification of the control system is calculated from the measurement of the power fed into the
heat conductor and the measurement of the temperature increase of the heat conductor. The P-factor for
the PIREG-D2 is calculated from this.
In the case of highly adverse conditions in the sealing transformer and heat conductor combinations or
the mains supply, the PIREG-D2’s P-factor can be corrected manually within a range of 30…250 % (
5.5.4.).
