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Did You Know? Change tuning parameters during operation

by Ken Doner

Servo amplifiers need to be tuned to optimize performance for each application. This normally straightforward task can be complicated if the speed and torque requirements vary greatly during machine operation, for instance when there are distinct loaded and unloaded states. The SV200 Series Servo Drives provide a couple of useful options to resolve this dilemma.

The digital input option

The first option to solve the varying load problem is to set up primary and secondary Proportional Constant (KP) values. The Proportional Constant sets the stiffness of the response of the system, and is the primary gain term for eliminating position error. Digital input X7 of the SV200 servo drive can be used to toggle between the two Proportional Constant values when the system is not moving. This allows the system to use the best gain setting for the upcoming machine state, e.g. loaded or unloaded. This functionality is useful when two different gain settings are required.

The streaming commands option

The second option is to access the drive’s tuning parameters directly via Modbus RTU or SCL communications. Writing to the tuning parameters during operation allows the user to optimize how the system responds to the different loaded and unloaded machine states. An advantage of this method is that multiple sets of tuning parameters can be employed, allowing the user to set tuning parameters for as many machine states as desired.

Changes made to the tuning parameters are held in non-volatile memory of the servo drive, so that at every power up the servo drive returns to the default tuning parameters. If at any time the user wishes to overwrite the default settings with new settings, the new settings can be saved to non-volatile memory using the Save Parameters (SA) command.

For more information...

  • If using Modbus RTU, the tuning parameter addresses can be found in the Modbus manual here.
  • For SCL communications refer to the Host Command available here.
  • For more information on the SV200 Series Digital Servo Drives click here.

SV200 Servo Drive

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