APPLICATIONS OF Σ-SERIES PRODUCTS3.2.5 Using Electronic Gear823.2.5 Using Electronic GearFor position control only.1) OutlineThe electronic gear function enables the motor travel distance per input reference pulseto be set to any value. It allows the host controller to perform control without having toconsider the machine gear ratio and the number of encoder pulses.When Electronic Gear Functionis Not UsedWhen Electronic Gear Func-tion is UsedWorkpieceNumber ofencoderpulses: 2048Ball screwpitch: 6 mmReferenceunit: 1 μmTo move a workpiece 10 mm,One revolution is equivalent to 6 mm, so10 6 = 1.6666 (revolutions)2048 x 4 (pulses) is equivalent to one revolution, so1.6666 x 2048 x 4 = 13653 (pulses)A total of 13653 pulses must be input as a reference.the host controller needs to make this calculation.Machine conditions and reference unitmust be defined for the electronic gearfunction beforehand.To move a workpiece 10 mm:Reference unit is 1 μm, so10 mm 1 μm = 10000 pulsesNumber ofencoderpulses: 2048Ball screwpitch: 6 mmWorkpiece2) Setting the Electronic GearCalculate the electronic gear ratio (B/A) according to the procedure below and set thevalue in Cn-24 and Cn-25.a) Check the machine specifications.Items related to electronic gear:− Gear ratio− Ball screw pitch− Pulley diameterb) Check the number of encoder pulses for the SGM Servomotor.Motor Type Encoder Type Number of EncoderPulses Per RevolutionSGM-jjj31jSGMP-jjj31jIncremental encoder 2048SGM-jjjW1jSGMP-jjjW1jAbsolute encoder 1024Same as user constant Cn-11 settings.3PositionsGear ratioBall screw pitch
