Understand the interface decision

Some designs retain absolute position information; others require a reference sequence or reconciliation with retained state. A stored value can be wrong if movement occurred without powered tracking. Restoring the supply therefore does not necessarily restore a valid heading or cable-twist estimate.

Electric-yaw arrangements differ between turbine designs. These questions describe control and interface reviews, not confirmed MARSTON hardware or operating logic. The relevant machine design, mechanical limits and risk assessment must establish the permitted movement and response.

Put these inputs in the review record

Use a project-specific worksheet to capture the following information. For each entry, name the document, revision and person responsible for resolving any uncertainty.

• Position-sensor type and behavior through power loss. Identify the exact configuration and the supporting document.
• Possible untracked movement and retained-state assumptions. Keep the design assumptions visible in the project record.
• The approved reference or reconciliation sequence. Name the responsible reviewer and resolve any missing information.
• Movement restrictions until position confidence is established. State how this entry will be verified during acceptance.

Define the acceptance boundary

Accept the recovery method when its assumptions match the physical design. Do not command an unrestricted reference movement merely because the controller has restarted. Cable limits, mechanical stops and other protective constraints remain relevant during reference recovery.

A functional test should distinguish power cycling without movement from a case involving possible untracked motion. The record must state which recovery conditions were demonstrated and which require separate design evidence.