In the control of industrial electrical heating, it is very advantageous if power controller variable current or voltage adapt to the respective requirements and handle temperature changes, ie changes in the electrical load, flexible. The Power controller GTF plus and GFW adv by Gefran meet the high requirements for the electrical heating of industrial processes. They work precisely, facilitate process diagnostics and enable connection to automation networks.
Adaptive power controllers such as the GTF plus and GFW adv are suitable for four operating modes: zero voltage switching, optimized pulse packet control and phase control. They can be linked to a wide variety of heating loads. Conventional resistors or those from Kanthal or Super Kanthal can be connected as well as heating elements made of silicon carbide, primary windings of transformers or long-, medium- and short-wave infrared radiators. In addition, the modern controllers require less cabling, save space in the control cabinet and reduce the acquisition costs.
Powerful algorithms such as Smart Load Management (SLM) and Dynamic System Control (DSC) optimize load management. The soft-start function DSC allows a gentle increase in the load voltage, reduces current peaks when switching on and optimizes consumption. The SLM function controls the electrical loads, taking into account the maximum total heat output of the system and the mass to be heated, with pulse packets over a predetermined period of time. In addition, automatic and fail-safe Dynamic Master control optimizes the power factor during steady state operation.
Both power controllers can be used at nominal currents from 25 to 250 A (GTF) or 40 to 250 A (GFW) and rated voltages of 480 VAC and 600 VAC. In addition, the GFW units provide a temperature input for PID control and alarm outputs. An external control panel facilitates the operation of the controller. It allows the parameterization, the storage of the parameter sets and the display of the operating data such as load current, voltage and power as well as mains frequency.
For the operating modes "zero-voltage switching" and "pulse-packet control", single-stage controllers of type GTF can be expanded by two further slave modules to a three-phase controller if required. They can be controlled via potentiometer, digital or analog signal or via Modbus RTU protocol. In contrast, the GFW controllers allow three-phase operation for all four operating modes. The parameters are parameterized via the PC, the process data acquisition thanks to the fieldbus interface optionally via a Modbus TCP, Profibus, CANopen, Ethernet IP or Ethercat.