Pluggable Relay Reset Mechanism for Fault-Latched Switches
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Solution Overview
Problem
In process control systems, electronic devices often lack space for a reset switch or input, making it difficult to reset them manually after a fault-induced shutdown without a separate reset input or bus system connection.
Innovation Solution
A manually resettable switch apparatus with a pullable or unpluggable relay that monitors its insertion and reinsertion to reset the device, using a control and evaluation device to detect faults and switch states, allowing manual reset by unplugging and re-plugging the relay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate reset switch or input is added to enable manual reset after fault shutdown, then the ease of operation is improved, but the device complexity and space requirements increase
Solution Approach 1:
The relay is designed to perform dual functions: its primary switching function and a secondary reset function. The same relay component that controls the circuit also serves as the reset trigger when removed and reinserted, eliminating the need for a separate reset switch or input terminal. This multi-functionality approach directly resolves the contradiction by providing manual reset capability without adding additional components or increasing device complexity.
Solution Approach 2:
The system uses the relay's own insertion/removal action to trigger the reset sequence. When the relay is pulled out and reinserted, the detection device automatically recognizes this action and initiates the reset process without requiring any additional reset inputs or external control signals. The relay essentially resets the system through its own mechanical action, eliminating the need for separate reset mechanisms.
2Ease of operation
If a reset switch is added to enable manual reset, then the ease of operation is improved, but the housing space requirements increase
Solution Approach 1:
The relay serves dual purposes as both a circuit switching device and a reset trigger mechanism. By using the existing relay's physical presence and removal as the reset signal, the invention eliminates the need for additional reset switches, buttons, or input terminals that would consume valuable housing space in narrow terminal block housings.
Solution Approach 2:
The reset function is extracted from the traditional concept of a separate reset switch and integrated into the relay's mechanical operation. The relay's removal and reinsertion itself becomes the reset trigger, removing the need for dedicated reset components and freeing up housing space while maintaining manual reset capability.
3Ease of operation
If the relay is made manually pluggable to enable reset, then the ease of operation is improved, but the reliability may worsen due to potential connection issues
Solution Approach 1:
The control and detection device continuously monitors the relay's insertion state and is pre-configured to recognize when the relay has been removed and reinserted. This preliminary preparation ensures that the system is ready to immediately execute the reset sequence upon detecting the relay's reinsertion, minimizing any potential reliability issues from connection transitions and ensuring a smooth, reliable reset process.
Solution Approach 2:
The detection device provides continuous feedback about the relay's insertion state to the control device. This feedback mechanism ensures that the system reliably detects when the relay has been pulled out and reinserted, triggering the reset sequence only when appropriate. The feedback loop maintains system reliability by ensuring accurate state recognition and proper timing of the reset operation.
Data Source
AI summary
A manually resettable switch apparatus, which is controllable into a first or a second operating state, includes: a current path with an input terminal to which an input voltage can be applied, and an output terminal, a manually pluggable relay having a coil and a switching element which is switched into the current path when the relay is plugged in, a control and evaluation device which is designed to detect a defective operation of the switch apparatus and, in response thereto, to set the switch apparatus to the second operating state, and a detection device which is electrically connected to the control and evaluation device and is designed to signal to the control and evaluation device whether the relay is plugged in or unplugged. The control and evaluation device is further designed: i) to detect whether the relay has been unplugged after a detected defective operation and has been plugged in again after a predetermined time has elapsed, and if so, ii) to set the switch apparatus to the first operating state.