Guard locking controls when an access guard can be opened. The decision to use it starts with the machine hazard, how long that hazard persists and how quickly someone could reach it, then includes the door, locking device and control system as one function.
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Start with the hazard, the stopping behaviour and how quickly someone can reach the danger after opening the guard. Review the required access and escape arrangements as part of the machine assessment. Specify the locking, monitoring, release and restart functions together, then validate the complete installed safety function.
Record the hazardous movement or process and how its safe condition will be established. Include run-down and other relevant stored or continuing hazards. The release decision must follow the machine assessment, not an assumed delay copied from another installation.
Define what confirms the guard is in position and what confirms the locking condition required for the task. Document how these states are used by the controls. A door that looks closed is not a substitute for proving the specified safety function.
Describe the normal operator sequence from requesting entry to resuming production. Include the machine’s response while stopping or waiting for the release condition. Make any status indication meaningful so an operator can distinguish waiting, permitted access and a fault.
If someone can enter the safeguarded space, include foreseeable occupancy, escape and restart arrangements in the assessment. Consider access from every relevant door. Requirements depend on the complete machine and tasks; the locking device alone cannot resolve them.
Agree the required behaviour during loss of power, a damaged door, missing signals or a release fault. Emergency or auxiliary release arrangements need a defined purpose and controlled return-to-service procedure. They should not become a routine workaround for poor access design.
Include guard mechanics, sensors, logic and the machine response in the validation scope. Retain drawings, settings and the agreed inspection method. Use the guard-locking checklist to record the intended access and release sequence.
An existing access door and a planned machine modification need the same clear definition of hazards, entry tasks and release conditions. The mechanical and control boundaries determine the assessment scope.
Identify the tasks, entry routes and hazardous conditions that must be controlled.
Document each state and who owns its implementation in the machine controls.
Check mechanical mounting, monitoring, fault handling and any occupied-space arrangements.
Record the tested functions and establish inspection and maintenance responsibilities.
Your final solution for guard locking and controlled release must reflect the law, current standards and site-specific risks that apply to your installation.