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

8.6 Operating Using Position Control(3) Related ParametersPn202Electronic Gear Ratio (Numerator)PositionPn203Setting Range Setting Unit Factory Setting Setting Validation1 to 65535 − 4 After restartElectronic Gear Ratio (Denominator)PositionSetting Range Setting Unit Factory Setting Setting Validation1 to 65535 − 1 After restartIf the deceleration ratio of the servomotor and the load shaft is given as n/m where m is the rotation of the servomotor andn is the rotation of the load shaft,BElectronic gear ratio: =APn202 No. of encoder pulses × 4 m= ×Pn203 Travel distance per loadnshaft revolution (reference units)* If the ratio is outside the setting range, reduce the fraction (both numerator and denominator) until you obtain integerswithin the range. Be careful not to change the electronic gear ratio (B/A).• IMPORTANTElectronic gear ratio setting range: 0.01 ≤ Electronic gear ratio (B/A) ≤ 100If the electronic gear ratio is outside this range, the SERVOPACK will not operate properly. In this case, modify the loadconfiguration or reference unit.(4) Procedure for Setting the Electronic Gear RatioUse the following procedure to set the electronic gear ratio.Step Operation Description1 Check machine specifications. Check the deceleration ratio, ball screw pitch, and pulley diameter.2 Check the number of encoder pulses. Check the number of encoder pulses for the servomotor used.3 Determine the reference unit used. Determine the reference unit from the host controller, considering themachine specifications and positioning accuracy.4 Calculate the travel distance per load shaftrevolution.Calculate the number of reference units necessary to turn the loadshaft one revolution based on the previously determined referenceunits.5 Calculate the electronic gear ratio. Use the electronic gear ratio equation to calculate the ratio (B/A).6 Set parameters. Set parameters using the calculated values.88-51