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3.1.2. Setting temperature coefficients:
The heat conductor's temperature coefficient, which must be
positive, must be set on the PIREG-D2 (
5.7.1.). The temperature coefficient is a material constant that
depends on the alloy used for the heat conductor.
Caution
(EN)
:
Using heating conductors with too low a temperature coefficient, or adjusting the
controller to a temperature coefficient that is too high, can result in uncontrolled overheating or
melting
of the heating conductor.
Attention
(FR)
:
Si un conducteur de chaleur est utilisé avec un petit coefficient de température
ou qu’un coefficient de température trop grand est réglé sur le régulateur, les conducteurs de
chaleur vont chauffer de manière incontrôlée et peuvent aller jusqu’à
fondre
.
The actual value cannot then reach the target value and the controller continues to heat up. For heat
conductors which have a temperature coefficient deviating from the four possible ones, the variable tem-
perature coefficient setting must be used.
3.1.3. Calibration reference time:
In the calibration process (
3.2.), the heat conductor's resistance is
determined at reference temperature. To ensure that the reference resistance value determined is cor-
rect, the resistance of the heat conductor is measured again after the calibration reference time has ex-
pired, and compared to the determined reference resistance measured previously. If the difference be-
tween the two measurements is greater than 1.2%, a new calibration process is started. This prevents
calibration from taking place on a heat conductor which is still cooling. The greater the calibration refer-
ence time selected, the sooner resistance changes in the heat conductor, caused by cooling during cali-
bration, are detected .
3.1.4. Temperature range:
The PIREG-D2 offers a choice between the four fixed temperature ranges of
200, 300, 400 and 500°C and a variable temperature range with an adjustment range of 100°C-500°C.
The overtemperature (rated value +20%) and undertemperatures (-10°C) apply accordingly.
3.1.5. Calibration mode:
- New calibration:
If the calibration mode “new-calibration“ is chosen, the PIREG-D2 performs a calibra-
tion after every power-on or the signal “Reset”. The calibration values are not saved. Calibration can also
be started in the Off- or error state with the signal “Calibration Start”.
- Save calibration:
Calibration is only started with the signal “Calibration Start”. The signal “Calibration
Start” can be applied in the Off- or error state or before power-on. The calibration values are stored in a
non-volatile memory and cannot be deleted by a power on or the signal “Reset”. This means that a new
calibration must be performed after the heating conductor configuration was changed or modifications
were carried out on the transformer. The saved values are then overwritten with the newly determined
values.
3.1.6. Transformer type:
The PIREG-D2 must be adapted to the type of sealing transformer, EI or toroi-
dal core. The next time the power is switched on, the transformer is charged with multiple unipolar phase
angles and the remanence is taken to a specified position in the transformer's iron core. The phase an-
gle's current conduction angle for setting the remanence is adapted to the type of transformer, during the
process. The rapid switch-on process is used for every sealing procedure with the transformer being
charged by only a small number of remanence setting pulses before being switched on completely. With
toroidal core transformers, if the pause between the two sealing procedures is longer than 10 minutes,
the number of rapid switch-on process pulses is doubled. The soft switch-on procedure is used for switch-
ing on high-quality transformers without power surges occurring.
3.1.7. Reference temperature:
The reference temperature is the environmental temperature at which the
heat conductor resistance, called reference resistance (Rref) is determined during the calibration process.
With the PIREG-D2, the reference temperature may be set between 0 and 50°C.
3.1.8. Temperature coefficient correction:
The PIREG-D2 provides two temperature coefficient correc-
tions, with which scattering of the heat conductor materials, caused by alloys, can be corrected.
- Temperature coefficient correction:
In normal temperature coefficient correction, the heat conductor
is heated up in eight temperature steps. At each step there is a comparison with the actual heat conduc-
tor temperature and an actual value correction depending on the deviation. The normal temperature coef-
ficient correction is part of the calibration process (
3.2.) and also occurs as part of it.
- Single-point temperature coefficient correction:
In the case of the single-point temperature coeffi-
cient correction, correction occurs for one operating point. The single-point temperature coefficient correc-
tion is carried out outside of the calibration process and is started from the Off state.
3.2. Calibration
During calibration, the PIREG-D2 independently adapts to the combination of sealing transformer and
heat conductor. At the same time, the voltage Ur at the heat conductor and the current Ir through the heat
conductor is measured every second. This status is indicated by the corresponding operating status sym-
bols in the symbol field of the Working menu on the display unit (
5.3.). If you make suitable adjust-
ments, a Calibration OK message, which is reset during calibration, may be issued by the PIREG-D2's
three relay outputs. Additional information on the progress of the individual calibration steps is shown by
the actual value display or output. The actual value is updated every second.
