Siemens G120C Error A06921: Braking resistor phase asymmetry

Siemens G120C drive · taken from the manufacturer’s manual, pages cited

Fault codeA06921

The braking resistor phases are not symmetrical or experiencing oscillations from fluctuating loads. The manual lists no action for this code.

Model
Siemens G120C
Display shows
Braking resistor phase asymmetry (A06921)
Type
Fault code
Source
Manual p. 697

What A06921 means

Braking resistor phase asymmetry p. 697

Common causes

  • - the three resistors of the braking chopper are not symmetrical. p. 697
  • - DC link voltage oscillations caused by fluctuating loads of the connected drives. p. 697

If A06921 is still not resolved

  • contact service / dealer p. 4
    “Warning concept This Manual contains information which you must observe to ensure your own personal safety as well as to avoid material damage.”
  • contact service / dealer p. 12
    “WARNING Danger to life if the safety instructions and residual risks are not observed”
Open the manual at page 697 All G120C error codes Manual details & download

This page summarises what the manufacturer’s manual says about A06921; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Siemens. Found a mistake? Report an error.