100099

Access servo machine data

Navigate to HMI → Commissioning → Machine data → Servo and check MD30100 (CTRLOUT_TYPE), MD30200 (ENC_TYPE), and MD30300 (MOTOR_TYPE) for correct values.

Always backup machine data before making changes using Archive → Machine data

Verify drive-specific parameters

Check MD36010 (SERV_PULSES_PER_REV) and MD36020 (SERV_LEAD_SCREW_PITCH) match your actual hardware configuration.

Incorrect encoder resolution can cause severe positioning errors

Reset servo parameters

If values are incorrect, modify the parameters, perform NCU reset via HMI → Commissioning → Reset → Mode 1 (POWER ON), and monitor alarm status.

Check encoder diagnostics

Navigate to HMI → Diagnostics → Servo → Encoder and examine encoder status, signal quality, and error counters for the affected axis.

Look for intermittent signal loss or noise patterns in the encoder trace

Inspect encoder connections

Verify encoder cable connections at motor, junction box, and drive module. Check for loose connections, damaged cables, or EMI interference.

Power down system before checking encoder connections

Perform encoder calibration

Execute encoder reference point calibration via HMI → Commissioning → Axis → Reference point → Set reference point to re-establish proper encoder feedback.

Check bus diagnostics

Navigate to HMI → Diagnostics → Hardware → PROFIBUS/PROFINET and examine bus status, telegram errors, and slave station connectivity.

Look for cyclic telegram errors or slave station dropouts

Verify bus configuration

Check MD10000 (NUM_AXES) matches actual configured drives and verify PROFIBUS address settings in MD10070 series parameters.

Incorrect bus addressing can cause multiple axis errors

Reset communication

Perform bus reset via HMI → Commissioning → Hardware → Bus reset, then restart NCU to re-establish proper communication protocols.

Check firmware versions

Navigate to HMI → Diagnostics → Version → Hardware and compare NCU firmware version with servo drive firmware versions for compatibility.

Document all firmware versions before any updates

Verify parameter compatibility

Check Siemens compatibility matrix for your specific NCU and drive combination, focusing on supported parameter ranges and data types.

Update firmware if required

If incompatibility is found, update drive firmware using STARTER software or NCU firmware via Siemens update packages, following proper update procedures.

Always backup complete system configuration before firmware updates