Terminal Block Integrating Fuse for Three-Wire Field Device Coupling
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Solution Overview
Problem
Current process control systems face complexity and increased cost when coupling three-wire field devices to controllers, as they require additional components and wiring, including an external power source and separate fuses, which complicates maintenance and updates.
Innovation Solution
The development of a terminal block that allows direct coupling of three-wire field devices to a process control system, incorporating a built-in fuse for surge protection and providing an interface between the power source and field devices, reducing the need for external components and simplifying wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-wire field devices are coupled to external power sources with separate fuses, then reliable power supply and surge protection are achieved, but device complexity and wiring complexity increase
Solution Approach 1:
The patent combines the fuse and power supply functions into an integrated terminal block assembly. The terminal block incorporates built-in fuse holders and power distribution terminals, merging previously separate components (external fuse, external power source connection) into a single integrated unit that maintains surge protection while simplifying wiring
Solution Approach 2:
The terminal block is designed as a multi-functional component that simultaneously provides signal termination, power distribution, and surge protection through integrated fuse holders. This universal design eliminates the need for separate external fuses and power connections, reducing overall system complexity while maintaining reliability
2Ease of repair
If terminal blocks are removed and reinstalled, then maintenance and updates are enabled, but wiring connections may be disrupted
Solution Approach 1:
The terminal block is designed as a removable module that can be easily detached from the circuit board while maintaining secure connections during operation. The segmentation allows the terminal block to be removed for maintenance or updates without requiring disruption to the overall system wiring, as connections are maintained through the terminal block's integrated design
Solution Approach 2:
The terminal block serves as an intermediary component between the circuit board and field devices. This intermediary design allows maintenance personnel to remove and replace terminal blocks without affecting the underlying circuit board connections, maintaining connection stability while enabling easy maintenance
Data Source
AI summary
Example apparatus to communicatively couple three-wire field devices to controllers in a process control system are disclosed. An example terminal block is disclosed that includes a first interface including termination points to couple with a field device, a second interface to couple with a shared bus of a termination panel, wherein the shared bus is to remain coupled to a controller when the terminal block is removed, a third interface to couple with a power bus of the termination panel, and a fuse disposed between the first interface and the third interface.