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The PIREG–D2 temperature controller has four control inputs and three relay outputs to control the film
sealing machine. The PIREG-D2 temperature controller can control a film sealing machine independently
via the latter and the integrated sequence control. The three relay outputs are divided into one message
output and two control outputs with different capacities. In addition, there is an alarm output.
The temperature coefficient of the heat conductor must be positive. Its resistance increases when it is
heated. This effect is used for temperature control. The temperature controller measure and regulates the
resistance of the heat conductor. The temperature coefficient is a material constant that depends on the
alloy used for the heat conductor. The actual temperature is determined by measuring the voltage and
current.
The PIREG-D2 operates as a proportional control unit that independently determines the P-factor (the
control amplification) for the controlled part of a process during calibration itself. The controlled system
consists of a sealing transformer and a heat conductor. The P-factor detected during the calibration pro-
cess may still be corrected later by the setting in the display unit or by a command (
5.2.5.). With an
additional control-function the typical offset at proportional controller will be minimized (from
V1.00/1.23/1.30/1.25).
The PIREG-D2 is operated either via the built-in display unit (
5.) by five buttons (
4.1.) or by the
RS232 or USB interface which is fitted to the PIREG-D2. Combinations of both types of operation are
also possible. An OLED module with eight lines with twenty-one digits each is used as display.
The PIREG-D2 is adjusted to the heat conductor's temperature coefficients (
5.7.1.). The PIREG-D2
can also determine a heat conductor’s actual temperature coefficient itself by means of a temperature
coefficient correction (
5.7.4.
).
Connect the PIREG-D2 via the RS232 interface to an external thermom-
eter exTM, DTM3000 (from V1.00/2.08/1.33/1.26) or previous TM6, which measures the actual tempera-
ture of the heating conductor to simplify the temperature coefficient correction. Depending on the setting,
the PIREG-D2 can operate up to a temperature range of 500°C.
During calibration, the controller sets itself to the secondary voltage of the transformer and the current
through the heat conductor. the secondary voltage of the transformer may be within a range of 1...80 V.
The current measured with a current transformer can range from 20 to 400A. The calibration values are
stored in the PIREG-D2, so that there is no need for renewed calibration and start-up time after switching
on the power, if conditions have not changed.
The PIREG-D2 can store the calibration settings for two heat conductors (from V1.00/1.23/1.30/1.25). At
this two calibrations it is necessary to use the same temperature coefficients, the same temperature
range, and the same other calibration settings (
3.). For each heat conductor a separate temperature
coefficient correction will be determined. The activation of the calibration switching and the change be-
tween this two calibrations will do by command or by control inputs (
5.6.2).
The PIREG-D2 performs the calibration process within a variable room temperature range of 0-50°C.
During the process, the actual reference temperature must be set in the controller's display unit (
5.7.2.). That is advantageous for constant sealing temperatures with differing environmental conditions.
High quality sealing transformers, such as toroidal core transformers, are connected by the PIREG-D2 on
the primary side, without current surges occurring. A smooth switching procedure is employed that com-
pensates for the remanence of the sealing transformer. An initialising remanence setting is made auto-
matically after switching on the power and following calibration,. Only a short remanence setting lasting
40 ms for eI core transformers and 80 ms with toroidal core transformers is needed before each sealing
process. If, with toroidal core transformers, the pause between two sealing processes is longer than 10
minutes, the remanence setting takes 160 ms. The remanence is the residual magnetization in the trans-
former's iron core. During the initial remanence setting procedure, the heat conductor has to be heated
for a short time to approx. 40 °C – 70 °C. The PIREG-D2 itself uses a phase angle controller to regulate
the temperature.
The PIREG-D2 provides the function measurement pause (from V1.00/1.23/1.30/1.25). At the measure-
ment pause the PIREG-D2 stops the sending of measurement impulse to the sealing transformer. There-
fore it is possibly to work at the head conductor circuit without to generate an error. The measurement
pause is controlled by control inputs or by command (
5.6.2.).
3. Functions
3.1. Control
With the PIREG-D2, there are the following control settings which must be performed before calibration
start. The PIREG-D2 peforms the heat conductor's adaptation to the voltage Ur and the current Ir and the
P-factor (control amplification) on its own.
3.1.1. Heat-up ramp:
A heat-up ramp is used to set the time value in which the controller increases the
actual temperature value to the target value with a linear ramp (
5.7.3.). This allows the heat conductor
to be heated gradually.
