Interlock Verification Test
Confirms that interlocks block or allow operation exactly as defined by the sequence.
What this test verifies
Functional commissioning test used to verify the logic of interlocks between systems, equipment, and control states.
Why it matters
Prevents unsafe or unintended operation by confirming that dependencies and safeguards work as designed.
Typical commissioning stage
Typical stage
Measurement method
- Trigger the required operating scenarios and interlock conditions.
- Verify that the system blocks, enables, or alarms exactly as defined.
- Compare actual behavior with the documented sequence of operations.
- Record each scenario, expected outcome, actual response, and evidence.
Acceptance criteria
- Each interlock should behave consistently with the approved sequence.
- No unsafe or unintended state should be possible when the interlock is active.
Commissioning notes
Interlock verification is one of the clearest examples of why commissioning extends beyond individual component checks. The goal is to prove that system-to-system dependencies behave correctly and safely under real operating scenarios.
For project teams, this test reduces handover risk because it exposes logic defects, sequencing gaps, and hidden integration issues before the client experiences them in operation.
FAQ
Why are interlock tests so important at handover?
Because they validate system behavior under the conditions that most often create risk: dependencies, blocked states, and transitions between operating modes.
What should be documented in an interlock verification?
The scenario tested, expected interlock logic, actual response, alarm or block behavior, and any mismatch that requires correction.