Principle of operation
RES-430
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Principle of operation
The resistance of the heatsealing band, which is tem-
perature-sensitive, is monitored 50x per second (60x at
60Hz) by measuring the current and voltage. The tem-
perature calculated with the help of these measure-
ments is displayed and compared with the set point.
The secondary voltage of the impulse transformer is
adjusted by phase-angle control if the measured values
deviate from the set point. The resulting change in the
current through the heatsealing band leads to a change
in the band temperature and thus also its resistance.
This change is measured and evaluated by the
RESISTRON temperature controller.
The control loop is closed: ACTUAL temperature = SET
temperature. Even minute thermal loads on the heatse-
aling band are detected and can be corrected quickly
and precisely.
The thermoelectric control loop which is formed has a
highly dynamic response because purely electrical
variables are measured at a high sampling rate.
PLEASE NOTE!
RESISTRON temperature controllers play a significant
role in enhancing the performance of modern
machines. However, the full benefit can only be
obtained from the advanced technology offered by this
control system if all the system components, in other
words the heatsealing band, the impulse transformer,
the wiring, the timing signals and the controller itself,
are compatible with one another.
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Description of the controller
The microprocessor technology endows the RES-430
RESISTRON temperature controller with previously
unattainable capabilities:
•
Very simple operation thanks to AUTOCAL, the
automatic zero calibration function.
•
Good dynamic response of the control system
thanks to AUTOTUNE, which adapts automatically
to the controlled system.
•
High precision thanks to further improved control
accuracy and linearization of the heatsealing band
characteristic.
•
High flexibility: Secondary voltage range from 12V
to 42V, current range from 20A to 90A.
•
Automatic adjustment to the line frequency in the
range from 47Hz to 63Hz.
•
Increased protection against dangerous conditions,
such as overheating of the heatsealing band.
A time control (timer) function integrated in the con-
troller enables the complete heatsealing process to be
controlled on simple machines, such as table heatse-
aling tools. A configurable relay output can be used to
drive motors, energize magnets etc.
The process data is represented on an LC display with
4 lines and 20 characters. Various display languages
can be selected.
The real heatsealing band temperature is visualized on
the display both as a digital number in °C and in the
form of a dynamic bar.
In addition to the digital and bar indications on the dis-
play, the ACTUAL temperature of the heatsealing band
is supplied to an analog 0…10VDC output. The real
heatsealing band temperature can thus be visualized
on an external temperature meter (e.g. ATR-x).
The RESISTRON temperature controller RES-430 also
features an integrated fault diagnosis function, which
tests both the external system (heatsealing band,
wiring etc.) and the internal electronics and outputs a
selective error message in case of a fault.
The menu in the temperature controller itself can be
used to adapt to different heatsealing band alloys
(Alloy-20, NOREX etc.) and set the required tempera-
ture range (0…300°C, 0…500°C etc.).
The RESISTRON temperature controller RES-430 con-
sists of two components: a motherboard with a power
section for installation in the machine frame and a
separate display terminal. The compact design and the
plug-in connections make this controller easy to install.
We will be pleased to
contribute our many
years of experience
towards optimizing
your
heatsealing system.
