Product description
Version 2
RES-5008
Page 11
5.2
Functional principle
The resistance of the heating element, which changes with temperature, is measured by means of current and
voltage measurement, displayed and compared with the specified setpoint value. Measurements are made
50 times per second in a 50 Hz mains, 60 times per second in a 60 Hz mains.
The primary voltage of the impulse transformer is adjusted following the phase angle control principle, if the meas-
ured values deviate from the setpoint value. The related current change in the heating element results in a rise in
temperature and change of resistance. This change in resistance measured and evaluated by the RESISTRON
®
Temperature Controller RES-5008. The temperature controller adjusts the control variables according to the
change and the adjusted setpoint value.
Even the smallest thermal loads on the heating element are recorded and can be quickly and precisely corrected.
The measurement of pure electric variables, together with the high measurement rate, result in a highly dynamic
thermoelectric control circuit. The principle of primary-side transformer control proves to be especially advanta-
geous as it permits a very large secondary current range with low power loss. This permits an optimal adjustment
to the load and thus the desired dynamics with extremely compact device measurements.
5.3
Regulator features
The RESISTRON
®
Temperature Controller RES-5008 is controlled through the separate T-408-1 operator
terminal. The T-408-1 operator terminal can be used to adjust functions and parameters and also to display
important controller information.
The ACTUAL temperature of the heating element is output through the operator terminal and through an analogue
output 0…10 VDC. The real heating element temperature can be visualised on an additional external display
instrument.
The RES-5008 has an integrated error diagnosis. The error diagnosis checks the external system (heating
element, wiring, etc.) as well as the internal electronics. A differentiated error message is output through
the T-408-1 operator terminal, in case of malfunction.
The adjustment for different heating element alloys (alloy A20, Vacodil, etc.) and the adjustment of
the temperature range to be used (0…300 °C or 0…500 °C) can be made through coding switches on
the RESISTRON
®
Temperature Controller RES-5008 or through the ROPEXvisual
®
.
The compact design of the RESISTRON
®
Temperature Controller RES-5008 as well as the plug-in connecting
terminals make mounting and installation easier.
An overview of the most important features and functions:
• AUTOCAL - Easy calibration of the heating element by automatic zeroing.
• AUTOTUNE - high regulation dynamics by automatic adaptation to the regulating line.
• AUTORANGE - automatic configuration of the secondary voltage range and current range, high flexibility due
to the coverage of a secondary voltage range from 0.4 V to 120 V and a current range from 30 A to 500 A.
• AUTOCOMP - automatic phase correction
• Automatic adjustment to the mains frequency in the range of 47 Hz to 63 Hz.
• Wide voltage range for flexible use from 110 VAC to 480 VAC
• Easy and convenient system diagnosis and process visualisation through the free, downloadable software
ROPEXvisual
®
• Comprehensive error diagnosis
• Booster output available for connecting a switching amplifier
