16502 PIREG-C2 Gerätebeschreibung mit EtherNet_IP Bussystem191017 - EN.docx/ Page 8 of 66
heating conductor is calculated correctly. The time required for a calibration process depends on various
factors. The calibration duration is determined by the voltage at the heating conductor, the current flowing
through the conductor, the phase shift from Vr and Ir and the P-factor of the sealing transformer/heating
conductor combination. The controller needs maximum 48 or 63 seconds for one calibration process.
If the calibration process is not successful, e.g. because the P-factor has been determined incorrectly, the
controller makes another four attempts before reporting an error. In this case, the maximum calibration
time can amount to 240 or 315 s, depending on the temperature comparison time.
If the calibration mode “new calibration” is chosen, the controller always switches to calibration immedi-
ately after a power-on or after a reset and carries out a new calibration. Calibration can also be started in
the OFF or error state with the signal “Calibration Start”.
If the calibration mode “Save” is chosen, the controller switches to calibration when in an OFF or error
state or before power-on only when the “Calibration Start” signal is applied. In this type of calibration, the
calibration values are saved in a non-volatile memory and are loaded immediately after a power-on or the
“Reset" signal.
The operator or the controlling PLC can recognize the end of a successful calibration process as follows:
- without 8-point Tc correction: By observing the actual value on the characteristic voltage curves (see
Fig.1, steps 5, 6 and 7 with subsequent remanence and subsequent cooling of the heating conductor
from approx. 50 °C to approx. ambient temperature).
- with 8-point Tc correction: As before, but with subsequent 8-point Tc correction (see step 8). After the
last correction step, the controller is ready for operation. The PLC must then wait until the temperature of
the heating conductor has cooled down.
- with calibration OK message: The calibration OK message is reset when calibration is started and
reset at the end of successful calibration. The calibration OK message is the factory setting of the OK
output, which can be changed by command (KONF).
3.1.9. Single-point Tc correction: With the single-point temperature coefficient correction the tolerances
of the temperature coefficient of the heating conductor can be corrected for just one operating point. For
this operating point the actual temperature of the heating conductor is reported back to the PIREG-C2 as
actual value or directly as measured value of the TM6 thermometer from outside. The single-point Tc
correction is carried out outside the standard calibration and is started from the OFF state. Single-point Tc
correction has an OFF and an ON state. After the single-point Tc correction was started, the PIREG-C2 is
in the OFF state. When the PIREG-D is in the ON state, the heating conductor is heated to the tempera-
ture which was set as target value in the OFF state. After heating, only accept the temperature once the
heating conductor itself has reached the specified temperature. The actual value output indicates the not
yet corrected actual value temperature of the PIREG-C2. The single-point Tc correction finishes upon
exiting the ON state. The correction process is controlled with the “Start” signal or by command (STST).
Deviations of up to ±20 % between the calculated actual value temperature and the actual temperature of
the heating conductor can be corrected. The single-point Tc correction can only be performed if an 8-
point Tc correction was not carried out during calibration. The single-point Tc correction is reset at each
calibration.
The single-point Tc correction can be saved by command (STKA) so that it doesn't need to be repeated
after a new calibration but only when the heating conductor is replaced.
Performing the single-point Tc correction:
- manual operation: The single-point Tc correction is started by command (STKA). If the pulse-control
was configured by command (KONF) for the calibration start input (5), the single-point Tc correction can
also be started by applying a high signal for less than one second ( 4.7. and 4.11.). The PIREG-C2
retains the temperature set as set value as the temperature of the operating point as long as a low-signal
is applied as “Start” signal. When a high signal is applied as “Start” signal the PIREG-C2 heats the heat-
ing conductor to the temperature of the operating point. Now the actual temperature of the heating con-
ductor is set as target value. When a low-signal is applied again as "Start” signal, the PIREG-C2 calcu-
lates the correction factors for the single-point Tc correction and saves these values if "Save" was select-
ed as the calibration type.
- manual operation with the TM6 thermometer: The single-point Tc correction is started and controlled
as described above. The actual temperature of the heating conductor is measured with the TM6 ther-
mometer which is connected to the RS232 interface of the PIREG-C2. The PIREG-C2 automatically tries
to establish a connection with the TM6 thermometer at the beginning of the single-point Tc correction The
Calibration LED flashes at a cycle rate of 1 Hz when connection to the TM6 thermometer has been estab-
lished.
- automatic single-point Tc correction: The PIREG-C2 must be connected to the TM6 thermometer
and the set value for the heating time must be greater than zero for the automatic single-point Tc correc-
tion. The heating time is the period until the heating conductor has reached a uniform temperature in the
ON state of the single-point Tc correction. The heating time is set either in the Reset state or by com-
mand (KTKZ) ( 4.7. and 4.11.). Automatic single-point Tc correction is started as described above for
manual operation. The PIREG-C2 undergoes the automatic single-point Tc correction independently and
remains in the ON state for the preset heating time.
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