I. Details of Rod Mill DriveAl Each rectifier unit is rated to operate down to 75% of base speed by grid control. ... In this case the voltage of a group of motors will be reduced, since each section of the mill is fed from a group regulating auto transformer. ... Motor control is arranged so that if the speed reference is increased sufficiently to produce 106% of rectifier volts, the ... 1, 340 15 East 10 800 15 West II S37 16-23 East 2, 960 555/1, 000 12 East aquot; 16-23 West acac Firms Operatives employedanbsp;...