Siemens S120 servo drive startup alarm F30021 grounding repair

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Fault cause analysis

The monitoring time is too short

DC bus voltage does not exist

The rectifier unit or driver to which the component belongs is faulty

Input voltage setting error

Exploration of Solutions

Extend monitoring time

Provide DC bus voltage

Check and replace faulty components

Adjust the input voltage setting

Rectification unit/power unit not ready?

Siemens S120 servo drive startup alarm F30021 grounding repair