Modernization of reversing rolling mill 1500 main drive control system.
Modernization of reversing rolling mill 1500 main drive control system at “Asha Metallurgical Plant” JSC has been finished.
Electrical installation and commissioning were carried out without mill shutdown. Redundant G-M (generator-motor) circuit was used during installation. ASC specialists executed integration of the new cabinet for automatic control system with existing cabinets for converter sections KTE-5000/750V.
Modernization included replacement of obsolete analog automatic control system of the armature converter with a new digital system; analog exciter was replaced with a digital one; speed reference and passing counting systems were implemented.
CJSC “ASC” designed, produced, supplied and put into service the following equipment:
- armature converter control cabinet based on two Sinamics DCM Control Modules for 12-pulse rectification circuit;
- exciter cabinet based on Sinamics DCM digital thyristor converter;
- control cabinet based on Simatic S7-300 PLC (provides speed reference and passing counting system);
- wall-mounted swing arm control console with TP1200 touch panel (provides passing counting system, visualization and archiving).
According to Customer’s request a sensorless passing counting system was implemented:
- EMF signal is used as speed feedback;
- signal of metal gripping by a stand is generated by comparing calculated static moment and fixed setpoint;
- static moment is calculated by means of Sinamics DCM software.