Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Program/G-code · Intermediate · 30-120 minutes

Alarm 300609

Siemens 840D 300609 - Axis drive encoder cut-off frequency exceeded

Siemens SINAMICS drive alarm 300609: Axis drive encoder cut-off frequency exceeded. The encoder or position measuring system connected to the SINAMICS drive has reported a fault. This prevents reliable position feedback for the affected axis.

Siemens SINUMERIKProgram/G-codeIntermediate30-120 minutes

300609

Siemens 840D 300609 - Axis drive encoder cut-off frequency exceeded

Axis drive encoder cut-off frequency exceeded

Siemens SINAMICS drive alarm 300609: Axis drive encoder cut-off frequency exceeded. The encoder or position measuring system connected to the SINAMICS drive has reported a fault. This prevents reliable position feedback for the affected axis.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Encoder cable damaged or connector loose at drive or encoder end
  • Encoder signal amplitude below minimum specification — contamination or cable issue
  • SSI or EnDat measuring system communication fault
  • Encoder supply voltage out of specification
  • Measuring system hardware failure

Troubleshooting Steps

  1. 1Check encoder/measuring system cable for damage and reseat connectors.
  2. 2Clean the measuring system reading head and scale if contamination is present.
  3. 3Verify encoder supply voltage at the connector.
  4. 4Check SINAMICS drive diagnostics for detailed fault sub-codes.
  5. 5Replace encoder cable first; replace sensor head if cable checks out.

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Always verify with your machine manual or a certified technician before performing service procedures.