How do I fix Siemens SINUMERIK alarm 300512?

1. The deviation points to a local contamination of the encoder or an erroneous or loose encoder assembly. 2. The encoder must be examined accordingly. 3. Operation may commence again only after successful error correction as there is a risk of uncontrollable movements! 4. NCK reset 5. Switch control OFF - ON. 2-709

Siemens SINUMERIK codes

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 300512

Siemens 300512 - Axis drive direct feedback recognized

This alarm indicates that direct feedback from an encoder has been recognized and configured for the specified axis drive. This is typically an informational status rather than an error condition, confirming proper encoder detection and feedback loop establishment.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

300512

Siemens 300512 - Axis drive direct feedback recognized

Axis drive direct feedback recognized

The current rotor position and the position information read out by the encoder on ramp-up were compared with each other and a deviation of more than 45 degrees was found Control reaction: NC not ready. The NC switches to follow-up mode. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready.

Root Cause Summary

Safety

Drive/power/encoder circuit: hazardous voltages may remain in the DC link after power-off. Lock out / tag out, wait for discharge per the drive documentation, and use qualified personnel only.

Causes and Fixes

1
Verify system status
SAFETY: Ensure machine is in safe state before checking. Confirm this is an informational message, not an error requiring immediate action.
2
Check encoder connections
SAFETY: Power down system before inspecting connections. Verify encoder cables are properly connected and secured.
3
Monitor operation
Observe normal machine operation to ensure feedback system is functioning correctly.

Service Recommendedmedium confidence

Call a technician if:

·If this message appears unexpectedly during operation
·If encoder feedback appears inaccurate or unstable
·If you are unsure whether this is normal for your system configuration

Prevention

Validate program parameters against machine specs before execution
Use simulation to detect feedback issues early

Common Mistakes

Overlooking axis-specific parameters in the program
Assuming all control options are enabled by default

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