16502 PIREG-C2 Gerätebeschreibung mit EtherNet_IP Bussystem191017 - EN.docx/ Page 6 of 66
The calibration process will undergo the following steps:
3.1.1. Initialisation: During initialisation, the PIREG-C2 determines the data necessary for calibration. In
addition, it checks the selected temperature coefficient for dynamics and continuity in the selected tem-
perature range. Should the dynamics and continuity exceed the permitted limits, the PIREG-C2 will stop
the calibration procedure with Error 13 (parameter error). The reference temperature still set is checked in
the permitted range of 0…50 °C. If the reference temperature is outside this range, the PIREG-C2 will
also stop the calibration procedure with Error 13 (reference temperature selected too large).
3.1.2. Calibrating the input amplifier: The input amplifiers for Vr and Ir are adjusted in steps to the volt-
age and current at the heating conductor. In the first step, the required modulation reserve for the sealing
transformer/heating conductor combination is determined automatically if not set manually by command
(KASR).
During this step, different voltage values are applied to the actual value output every second. The meas-
ured current or voltage value is connected alternately. The measured value of the current is displayed in
the 0 - 5 V range, the voltage in the 5 - 10 V range. The zero point of the measured values is 5 V. At the
beginning of the calibration, the amplifiers (for Vr and Ir) are initialised with minimum amplification. At the
end of the calibration procedure, if the adjustment has been made successfully, the range for the dis-
played current value is from 1.66 - 3.33 V and the range for the displayed voltage value is from 6.66 -
8.33 V.
3.1.3. Determining the phase shift: During this step, the transformer-dependent phase shift between Vr
and Ir is measured and corrected. The controller automatically sets the optimum scan times for Vr and Ir.
The actual value output displays the phase shift. A signal of approx. 5 V corresponds to the ideal value.
3.1.4. Determining the reference resistance: ( 4.7. and 4.11.) The reference resistance of the heating
conductor (Rref) is determined in this step. The controller assumes a constant reference temperature of
20 °C for calibration. Alternatively, a variable reference temperature of 0...50 °C can be entered as nomi-
nal value (50 °C = 1.66 V at 300 °C and 1.00 V at 500 °C). While the calibration is being initialised, the
PIREG-C2 reads the variable reference temperature, depending on the settings. During calibration, the
heating conductor must be at the reference temperature to ensure that regulation is exact. By standardiz-
ing the voltage signal (Vr) 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 tem-
perature, then heating conductor's R20 is directly determined as the reference resistance. If a heating
conductor temperature other than 20 °C has been selected for calibration, then the determined reference
resistance corresponds to the temperature coefficient above or below the value for the R20. The refer-
ence resistance is displayed for one second at calibration stage 4 at the actual value output. At a refer-
ence temperature of 20 °C, the voltage at the actual value output is 7…8 V. At a variable reference tem-
perature the voltage will be between 6 and 10V.
3.1.5. Temperature comparison time: ( 4.7. and 4.11.) The aim of the temperature comparison time is
to ensure that the comparator resistance can only be determined when the heating conductor has com-
pletely cooled down. During this comparison 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 comparison time.
3.1.6. Checking the reference resistance: The comparator resistance is checked after the temperature
reference time is finished. If calibration takes place on a heating conductor that has cooled down still fur-
ther during the temperature comparison time, the entire calibration will be discarded and the procedure
automatically restarted. Once the reference resistance has been successfully checked, the PIREG-C2
calculates the R20 (resistance at 20 C) of the heating conductor from the type of reference temperature
set, the temperature coefficients selected and the reference resistance (Rref) determined.
The comparator resistance measured is displayed for one second at the actual value output. The same
voltage must be set at the actual value output as when the reference resistance was determined (
3.1.4).
3.1.7. Determining the P-factor: The P-factor of the sealing transformer/heating conductor combination
is determined by heating with a constant correction variable. The heating 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
heating conductor and the measurement of the temperature increase of the heating conductor. The P-
factor for the PIREG-C2 is calculated from this.
In the case of adverse conditions of the sealing transformer/heating conductor combinations or the public
supply the P-factor of the PIREG-C2 can be corrected manually within a range of 30…110 % ( 4.7. and
4.8.).
The P-factor monitoring which is set by command (PFUE) is used to monitor the P-factor determined by
PIREG-C2 on a valid range ( 3.4.4., 4.7. and 4.11.).
3.1.8. 8-point Tc correction: The 8-point temperature coefficient correction function can be used to cor-
rect tolerances of the temperature coefficients. These result from the dispersion of the metallurgical com-
position of the heating conductors.
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