Sigma-II Series SGM*H/SGDH USER'S MANUAL - Esco Drives ...

8 Operation8.6.2 Setting the Electronic Gear8.6.2 Setting the Electronic Gear(1) Number of Encoder PulsesSGMH- (Servomotor serial number)Motor ModelEncoder SpecificationsEncoder Type No. of Encoder PulsesA13 bits 2048BIncremental 16 bits 16384encoderC17 bits 327681Absolute 16 bits 163842encoder 17 bits 32768Note: For details on reading servomotor model numbers, refer to 2.1 Servomotor Model Designations.INFOThe number of bits representing the resolution of the applicable encoder is not the same as the number of encoder signalpulses (phases A and B). The number of bits representing the resolution is equal to the number of encoder pulses × 4 (multiplier).(2) Electronic GearThe electronic gear enables the workpiece travel distance per input reference pulse from the host controller to beset to any value. One reference pulse from the host controller, i.e., the minimum position data unit, is called a referenceunit.When the Electronic GearIs Not UsedWorkpieceWhen the Electronic Gear Is UsedWorkpieceReference unit: : 1 µmNo. of encoder pulses: 2048Ball screw pitch: 6 mm (0.24 in)To move a workpiece 10 mm (0.39 in):1 revolution is 6 mm. Therefore,10 ÷ 6 =1.6666 revolutions2048 × 4 pulses is 1 revolution. Therefore,1.6666 × 2048 × 4 = 13653 pulses13653 pulses are input as reference pulses.The equation must be calculated at thehost controller.No. of encoder pulses: 2048Ball screw pitch: 6 mm (0.24 in)To move a workpiece 10 mm using reference units:The reference unit is 1 µm. Therefore,To move the workpiece 10 mm (10000 µm),1 pulse = 1 µm, so10000/1=10000 pulses.Input 10000 pulses per 10 mm of workpiecemovement.8-50