Fault code

INVT GD270 STo Mal-adjustment fault

Diagnostic context

What STo means on INVT GD270

STo is the GD270 mal-adjustment fault. The manufacturer table associates it with incorrect SM control parameters, inaccurate autotuned parameters or the VFD not being connected to the motor.

Operating context: Review motor connection and control parameters first, then verify the load and the configured mal-adjustment detection time as listed in the manual.

This diagnostic context is an editorial explanation. The possible causes and recommended checks below are the verified manufacturer troubleshooting content.

Possible causes

  • Incorrect SM control parameter settings.
  • Autotuned parameters are not accurate.
  • The VFD is not connected to the motor.

Recommended checks and actions

  • Check the load and ensure the load is normal.
  • Check whether control parameters are set correctly.
  • Increase the mal-adjustment detection time.

Technical source

INVT GD270 Manual EN - Fault STo — page 280