The speed modes convolution machines control system

Convolutional machines are intended for coiling the strip by bending the band between the rollers. The alternating current motor drive of each convolution machine is individual (AC motors with squirrel-cage rotor type ARM 2P74-10b 10 kW, 500 V, 50 Hz, 550 rev / min). Energy delivery to eight motors of each convolution machine is carried out by reversing variable frequency inverter with rated current of 400 A, voltage of 380 V and cycles of 50 Hz. The system provides a backup inverter for three convolution machines.