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Modernization of electrotinning line 1200/III control system

     Customer: JSC Mittal Steel Temirtau

     The electrotinning line - 1200/III is destined for tin coating on the surface of the steel cold strip by electroplating technique. Final product is tin production for food industry.
     The electrotinning line includes the following areas:
  • Inlet area
  • Chemical area (middle area)
  • Outlet area
  • Cutup line
  • Stretch straightening machine
  • Radioisotope thickness gage for sectioning.
  • Sheet sorting machine (line).
  • A chemical underground store room (solvents and reagents preparation).

Picture No1

Requirements to automation system
  • It is necessary to classify a machine under local systems.
  • To save blockings and to organize emergency messages recording.
  • To change operators mnemocircuit on visualization on the basis of PC and OP.
  • To save tinning current diagram according to the all baths during the month.
  • To provide step-by-stem system implementation without long-time stop.
  • To connect local systems between systems for data exchange.

     It was decided to allocate eight local automation areas for operating staff comfort.
  • Drive and line transportation chain control system
  • Tinning current control system
  • Tension-leveler control system, drive.
  • Tension-leveler control system, technology.
  • Solvent temperature control system.
  • Cross cutting line control system.
  • Sorting line control system.
  • Radioisotope thickness gage control system.
     Electrotinning line control system is implemented on the basis of seven independent (local) PLC (Simatic S7-300) and a controller on the basis of 104 (thickness gage). All elements of control system are connected with their decentralize circumference by busbar Profibus-DP, whereas systems are connected between them by MPI, PROFIBUS and Ethernet.
     Visualization system includes four pulpits, situated on the line, equipped operators panels 270-10, six operators panels 73, situated on the sorting line, two operators panels on the sheet-leveler, one operators panel in the chemical underground store room. Also visualization is carried on the basis of PC: the first station combines diagnostics and condition for drive and cutting line, the second station combines tinning current area and solvents temperature in the chemical underground store room, the third station is tension-leveler technology and the fourth station is radioisotope thickness gage. Tinning line control is carried out from three pulpits: inlet, outlet and chemical area. Cutting line control is carried out from another pulpit.
     Operators sensor panel TP270 is destinied for displaying of technical process condition, also for electrolyte tinning line condition control. Developed graphic structure of OP on the basis of WinCC-flexible, allows an operator to control working modes, to watch and react on all emergency and pre-emergency conditions of line electric drives, also to control line technological parameters.
     All information is brought to the PC station for all technological process control and reacting at the moment of emergency situations. OP is developed on the basis of WinCC V6.0.

Project implementation period
     Project implementation period is 11 months, commissioning is November, 2007

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