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

8 Operation8.6.2 Setting the Electronic Gear(5) Electronic Gear Ratio Setting ExamplesThe following examples show electronic gear ratio settings for different load configurations.Step Operation Load ConfigurationBall Screw Disc Table Belt and Pulley1 Check machinespecifications.Reference unit: 0.001 mm13-bit encoderLoad shaftBall screwpitch: 6 mm• Ball screw pitch: 6 mm• Deceleration ratio: 1/1Reference unit: 0.1°Load shaft13-bit encoderDecelerationratio:3 : 1Rotation angle per revolution:360°Deceleration ratio: 3/1Reference Unit: 0.02 mmLoad shaftDecelerationratio2 : 1Pully diameter:100 mm16-bit encoderPulley diameter: 100 mm(pulley circumference: 314 mm)• Deceleration ratio: 2/12 Check the number 13-bit: 2048 P/R 13-bit: 2048 P/R 16-bit: 16384 P/Rof encoder pulses.3 Determine the reference1 Reference unit: 0.001 mm 1 Reference unit: 0.01° 1 Reference unit: 0.02 mm (20 µm)unit used. (1 µm)4 Calculate the travel 6 mm/0.001 mm=6000 360°/0.1°=3600 314 mm/0.02 mm=15700distance per loadshaft revolution.5 Calculate the electronicgear ratio. = ×B 2048 × 4 1B 2048 × 4 3B 16384 × 4 2A 6000 1= ×= ×A 3600 1A 15700 16 Set parameters. Pn202 8192 Pn202 24576 Pn202 131072 ∗Pn203 6000 Pn203 3600 Pn203 15700Reduce the fraction (both numerator and denominator) since the calculated result will not be within the settingrange. For example, reduce the numerator and denominator by four to obtain Pn201=32768, Pn203=3925 andcomplete the settings.(6) Electronic Gear Ratio EquationReference pulse∆ (mm/P)BA+-PositionloopSpeedloopServomotormnPitch = P (mm/rev)∆ (mm/P): Reference unitP G (P/R): Encoder pulsesP (mm/rev): Ball screw pitchm: Deceleration rationn × P B× ( ) = 4 × P × m∆ A GB∆GG( )= 4 × P × m × 4 × P=A n × P P∆×4××P G (P/rev)mnSet A and B with the following parameters.A Pn202 B Pn2038-52