Glossary · Safe work, maintenance and competence
Safety-critical maintenance
In machine safety, safety-critical maintenance is maintenance whose quality directly affects a protective measure or safety function, such as work on brakes, interlocks, protective devices or safety-related control parts.
- Machine safety
- Maintenance
In one sentence
Safety-critical maintenance is work on brakes, interlocks, guards or safety controls, where poor quality directly weakens protection.
Example
Replacing an interlock switch on a robot cell door is safety-critical maintenance: the technician uses the specified part, aligns the actuator, tests the function and documents the result before release.
How it applies
- Machine safety: A wrong spare part, a misaligned switch or a skipped test can leave a safety function defeated without anyone noticing. Identify which tasks are safety-critical and require a function test after completion.
- Technical documentation: Mark safety-critical tasks in the maintenance manual, specify approved spare parts and give test steps with acceptance criteria.
- Integrated systems: Replacing a safety component or reloading a safety program changes the configuration. It belongs under configuration control, including checks of parameters and checksums.
- Evidence: Records show who did the work, which part was fitted and the test result. For some safety functions, this links to proof test records.
Safety-critical maintenance vs. general maintenance
General maintenance keeps the machine productive. Safety-critical maintenance keeps its protection effective, so it needs stricter competence, parts control and verification.