Replacement of control system and management of continuous and accurate tension fixing on coilers of decarburization annealing plant-4B.
The specialists of «ASC» company have completed the start-up and adjustment works at decarburization annealing plant-4B.
The decarburization annealing plant is intended for continuous decarburization annealing of transformer sheets.
The project objective is maintaining the steady coiler tension, fixing the tension values and reducing quantity of riffles during coil opening on decoilers of straightening annealing plants.
The updated equipment of the coilers control system provides for:
- steady preset tension during the whole coil reeling process;
- management of continuous tension fixing and registered data transformation into electronic format;
- tension data communication to the second level;
- visualization of the following data on the control desk:
- strip speed in a tail section;
- coiler tension in kg;
- coil diameter in mm;
- speed of furnace rolls in m/min, etc.
- preliminary speed level selection:
- threading speed Vз=15 m/min;
- working speed Vр=0 – 60 m/min;
- plant acceleration from zero to a speed and braking setpoint selected by operator at the preset acceleration rate while maintaining the preset tension;
- possibility of isolated operation of electric drives of the plant;
The control system is built with the use of software and hardware tools of «SIEMENS» manufacture. The converters “SINAMICS DCM” are used for adjusting the speed of coilers and pinch rolls.