Handheld Safety Switch Illumination Control for Connection Verification
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Solution Overview
Problem
Existing safety switching elements in handheld control devices for electrically controlled systems lack reliability and clarity in indicating their functional effectiveness, particularly in temporary connections, leading to potential safety hazards due to incorrect operation or faulty lighting.
Innovation Solution
A control system with a redundant lighting control device that activates or deactivates the safety switching element's lighting based on the signal connection state, using a series of switching means to ensure reliable operation even if one fails, and includes a checking mechanism to monitor the lighting state and detect errors, with adjustable light intensity and automatic adjustment based on ambient brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hand-held operating device is temporarily connected to a control device for manual operation, then operator mobility and flexibility are improved, but the reliability of safety switching elements is worsened because it is not immediately apparent whether the device is connected and the safety switching element is functional
Solution Approach 1:
The patent uses color-coded lighting on the safety switching element to indicate its operational status. When the hand-held device is properly connected to the control device, the safety switching element illuminates in a specific color (e.g., green) to indicate it is functional. When disconnected or faulty, it shows a different color (e.g., red or off), making the connection status immediately apparent to the operator without requiring technical knowledge.
Solution Approach 2:
The patent introduces an intermediary indication mechanism (visual lighting system) between the hand-held device and the operator. This intermediary provides clear feedback about the connection status and functionality of the safety switching element, resolving the information asymmetry that occurs during temporary connections.
2Reliability
If organizational measures are prescribed to put away non-functional handheld control devices, then safety clarity is improved, but such measures are only implemented incompletely in practice, leading to errors
Solution Approach 1:
The system provides self-service safety indication through automatic lighting control. When the hand-held device is connected to the control device, the safety switching element automatically illuminates to indicate its functional status. When disconnected, it automatically turns off or changes color. This eliminates the need for operators to manually track or remember connection states, making compliance intuitive and automatic.
3Reliability
If safety switching elements are illuminated to indicate functional state, then visibility and clarity are improved, but the risk of faulty lighting or incorrect operation increases
Solution Approach 1:
The patent implements a feedback mechanism where the lighting system continuously monitors and reflects the actual connection status between the hand-held device and the control device. The safety switching element only illuminates when it detects a proper signal connection, providing accurate feedback about its operational state. This prevents misleading illumination and ensures the lighting accurately represents the true functional status.
Data Source
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AI summary
The invention relates to a control system for electrically controlled installations. The control system comprises at least one portable, mobile hand-held operating device for displaying information and for the inputting of control commands by an operator. The hand-held operating device has at least one manually actuatable safety switching element, an illumination device being associated with this safety switching element. The control system comprises at least one illumination control device, which illumination control device has, for activating and deactivating the illumination device, a first switching means and a second switching means, the second switching means being connected electrically in series to the first switching means.