Integrated AVT and PLI Load Control Assembly for Safe De-Energizing
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Solution Overview
Problem
Maintenance technicians face challenges in ensuring that load control units are completely de-energized before performing maintenance, as existing solutions like permanent independent electrical safety devices are costly and space-consuming.
Innovation Solution
The integration of an absence of voltage tester (AVT) and absence of voltage indicator into the load control assembly, along with a positive load identification (PLI) component and indicator, provides a cost-effective and space-efficient solution to ensure the load control unit is de-energized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent independent electrical safety device is installed in every unit, then the safety of maintenance personnel is improved, but the cost and space occupation increase significantly
Solution Approach 1:
The patent integrates the absence of voltage tester (AVT) functionality directly into the load control unit, combining safety verification functions with the existing control structure. This eliminates the need for separate independent safety devices, reducing both cost and space while maintaining safety effectiveness through the integrated AVT that detects voltage absence before maintenance operations
Solution Approach 2:
The load control unit is designed to perform multiple functions: normal load control operations and safety verification through integrated AVT functionality. The controller executes both control algorithms and voltage detection routines, making the device universal and eliminating the need for dedicated single-function safety devices in each unit
Data Source
AI summary
An industrial system includes a load control assembly, an integrated absence of voltage tester (AVT), and an absence of voltage indicator. The load control assembly has a supply input, a load output, a disconnecting device, and a load controller coupled to the load output, with the disconnecting device coupled between the supply input and the load controller. The AVT is integrated into one of the disconnecting device and the load controller, and the AVT configured to detect an absence of an operating voltage of the load control assembly. The absence of voltage indicator is coupled to the AVT and configured to indicate the absence of an operating voltage of the load control assembly detected by the AVT.