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

11 Appendix11.1.3 Calculating the Required Capacity of Regenerative Resistors(b) SERVOPACKs with Capacities of 500 W to 5.0 kWServomotors with capacities of 500 W to 5.0 kW have built-in regenerative resistors. The allowable frequenciesfor just the servomotor in acceleration and deceleration operation, during the rotation speed cycle from 0(min -1 ) to the maximum rotation speed to 0, are summarized in the following table.Convert the data into the values obtained with actual rotation speed and load moment of inertia to determinewhether an external regenerative resistor is needed.Voltage Series Allowable Frequencies in Regenerative Mode (times/min)Capacity 22 32 40 44 50Symbol200 V SGMGH-AA − − − 11 −SGMGH-AB − − 20 − −SGMSH − − 29 − 22SGMDH 7 11 8 − −400 V SGMGH − − − 11 −SGMSH − − 29 − 22SGMUH − − 19 − −Load moment of inertia =0(servomotor only)Speed reference0tMaximum rotation speedServomotor rotation speed 0tServomotor-generated torque 0Regeneration modetMaximum torqueT(Operating cycle)Allowable frequency = 1/T (times/min)Maximum torqueFig. 11.1 Operating Conditions for Allowable Regenerative Frequency CalculationUse the following equation to calculate the allowable frequency for regeneration mode operation.Allowable frequency =• n = J L /J MAllowable frequency for Servomotor only(1 + n)• J M : Servomotor rotor moment of inertia (kg·m 2 )• J L : Load converted to shaft moment of inertia (kg·m 2 )×Max. rotation speedRotation speed2(times/min)11-8