What can cause galloping/surging behavior on an ATS480 application?

Ramp-Up and Control Mode Considerations

Ramp-up issues in various applications may require adjusting the drive’s control mode to achieve smoother acceleration.

• Voltage Control Mode
  Operating in voltage control provides a linear voltage/ramp profile rather than torque-based regulation.
  This mode forces the drive to follow the programmed ACC (acceleration) time, instead of relying on automatic torque-adjusted ramping.
  Switching to voltage control can help stabilize applications where torque control causes oscillation, slow response, or inconsistent ramping behavior.

• Deceleration and Stopping Behavior
  If the load exhibits undesirable behavior during stopping—such as mechanical shock, noise, or instability—change the stop type from freewheel to deceleration.
  Controlled deceleration provides smoother stopping and reduces the impact on the mechanical system.

• Additional Checks

  • Inspect the application for load instability or mechanical issues.
  • Verify voltage balance on the incoming supply.
  • Measure line-side and load-side currents on the soft starter or drive to detect imbalance, overloading, or inconsistent phase conditions.

If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:

Frequently Asked Questions - Schneider Electric (se.com)

If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us at drive.products.support@se.com to create a case with our Technical Support Team.

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