Heatseal band R = f (T)
Current transformer
Transformer
U
prim.
1
U
sec.
2
Controller
Temperature
meter
Start
Set point
Line
R O P E X
R O P E X
R O P E X
R O P E X
INDUSTRIE - ELEKTRONIK GmbH
Page 3
R=f(T)
Alarm
Regulating
logic
+
_
°C
I
R
U
R
RESISTRON
RES controllers
are electrical resistance-measuring,
temperature regulating units. They use the characteristics
of certain heatseal elements that change their resistance
in a fixed ratio to the change in temperature.
This characteristic of the heating element is expressed by
its temperature coefficient T .
For a dependable temperature control the heating
element must have a coefficient of T
+8 10 K .
The resistance is constantly monitored (50 times per
second with 50 Hz; 60 times/second with 60 Hz) by
k
k
x
-4
-1
2. PRINCIPLES OF OPERATION
measuring the current through the element and the
applied voltage. This information is fed back to the
controller as the process variable "PV". It is also supplied
for display on the temperature meter. After comparing this
information with the set point "SP", the controller adjusts
the voltage output to the heating element so that it will
always maintain the desired temperature (resistance).
Voltage control is accomplished by phase-angle-control
of the primary current going to the transformer.
The high response feed back facilitates extremely fast
temperature changes.
Please Note
RES temperature controllers
complete system
must be perfectly matched for best results
The
are important
components for modern machines with higher speeds.
The technical possibilities offered by this control system
however, can only be achieved by optimizing the
. The heatseal element, the heatseal
transformer, the wiring, the signaling, and the controller
.
We will be happy to help you optimize your system
with the right design and selection of components.
Many years of experience are at your disposal.
