Exposure Setting Locking for Safe Partial Equipment Operation
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Solution Overview
Problem
Industrial equipment safety systems often require complete shutdown for safety, but partial operation is desirable for certain tasks, posing a risk to personnel as equipment levels of operation can be changed while individuals are exposed to hazards.
Innovation Solution
A system with a safety interlock device functionally coupled to an access point and industrial equipment, allowing multiple levels of operation while ensuring safety by automatically suspending or allowing equipment operation based on the access point's state, using a controller to lock or unlock exposure settings accordingly, and preventing invalid combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete shutdown of equipment is implemented for safety, then safety of personnel is improved, but productivity and operational flexibility deteriorate
Solution Approach 1:
The equipment operation is segmented into multiple exposure settings (first exposure setting with higher operability, second exposure setting with lower operability). This allows the system to provide different levels of access and operation rather than a single complete shutdown or full operation state, resolving the contradiction between safety and productivity.
Solution Approach 2:
The system dynamically adjusts the equipment operability based on the access point state. When the access point is closed, the equipment operates at full capacity (first exposure setting). When the access point is open, the system transitions to a restricted mode (second exposure setting) or complete shutdown, providing adaptive safety control that maintains productivity when safe and ensures safety when needed.
2Productivity
If multiple levels of operation are allowed, then productivity is improved, but safety risk increases as equipment settings can be changed while personnel are exposed to hazards
Solution Approach 1:
The system preemptively prevents harmful changes by locking the exposure setting when the access point is open. This preliminary protective action ensures that personnel cannot accidentally or intentionally change equipment settings while exposed to hazards, eliminating the safety risk associated with mutable settings during access.
Solution Approach 2:
The controller continuously monitors the access point state and automatically adjusts the exposure setting lock status accordingly. When the access point transitions from closed to open, the system detects this change and locks the current exposure setting, preventing any further changes until the access point is closed again, thus providing continuous safety feedback.
3Reliability
If exposure settings are locked during access, then safety is improved, but ease of operation deteriorates as settings cannot be adjusted
Solution Approach 1:
The exposure setting lock status is dynamic rather than static. The settings are locked only when the access point is open (during personnel exposure), and automatically unlocked when the access point is closed (when personnel are safe). This dynamic behavior provides safety when needed while maintaining full operational flexibility when safe.
Data Source
AI summary
Systems and methods are provided for locking equipment exposure settings. The system includes a safety interlock device coupled to an access point of a barrier and equipment enclosed thereby. The safety interlock device is configured to suspend a normal operation of the equipment while in an open state and allow the normal operation while in a closed state. The system includes an access point control device configured to allow a user to select among exposure settings for the equipment corresponding to operability of the equipment, and to, by a processor: control the equipment to operate in accordance with a selected exposure setting, determine whether the safety interlock device is in the open or closed state, automatically lock the selected exposure setting if the safety interlock device is in the open state, and automatically unlock the selected exposure setting if the safety interlock device is in the closed state.