Description of the controller
Page 8
RES-408
Version 1
the system components, in other words the heatsealing band, the impulse transformer, the wiring, the timing sig-
nals and the controller itself, are compatible with one another.
4
Description of the controller
The microprocessor technology endows the RES-408 RESISTRON temperature controller with previously unat-
tainable 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 con-
trolled system.
• High precision thanks to further improved control accuracy and linearization of the heatsealing band character-
istic.
• High flexibility: The AUTORANGE function (as of June 2006) covers a secondary voltage range from 0.4V to
120V and a current range from 30A to 500A.
• 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.
The temperature can be set on the separate T-408-1 (or T-400) operator terminal.
The real heatsealing band temperature is also visualized on the operator terminal.
The RES-408 RESISTRON temperature controller 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 mes-
sage in case of a fault.
To increase operational safety and interference immunity, all 24VDC logic signals are electrically isolated from the
controller and the heating circuit.
Coding switches on the temperature controller itself can be used to adapt to different heatsealing band alloys
(Alloy A20, LEX3500 etc.) and set the required temperature range (0...300°C, 0...500°C etc.) on all controllers
manufactured as of June 2006.
We will be pleased to
contribute our many
years of experience
towards optimizing
your
heatsealing system.
Control
logic
R=f(T)
+
_
Set point
Start
Indicators
and
controls
or
bus interface
Actual value
LINE
RESISTRON controller
Heatsealing band R = f (T)
Current
transformer
Impulse transformer
UR
IR
prim.
U1
sec.
U2