Siemens G120C Error 900A: Actual position/speed value incorrect or not available (11)

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

Fault code900A

An illegal signal state was detected while evaluating encoder signals, such as track signals or zero marks, on the Siemens G120C drive. The manual's first action is: “Check the encoder / state of the encoder signals. Observe the maximum permissible frequencies.”

Model
Siemens G120C
Display shows
Actual position/speed value incorrect or not available (11) (900A)
Type
Fault code
Source
Manual p. 654

What 900A means

Actual position/speed value incorrect or not available (11) p. 654

Common causes

  • An illegal signal state was detected while evaluating the encoder signals (track signals, zero marks, absolute values ...). p. 654

What to do

  1. Check the encoder / state of the encoder signals. Observe the maximum permissible frequencies. p. 654

Before you service the product, read the safety instructions in the manual p. 4.

If 900A 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 654 All G120C error codes Manual details & download

This page summarises what the manufacturer’s manual says about 900A; 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.