Digital LOP Motor Control Center Using Integrated Module
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Solution Overview
Problem
The existing motor control center systems face inefficiencies and high maintenance costs due to the need for numerous analog signal lines and power lines, which complicate communication and power supply redundancy, especially when digital local operating panels (LOPs) are distant from the motor control board.
Innovation Solution
A motor control center system utilizing an integrated module connected through serial communication networks to multiple protection control modules and LOP controllers, with power supply modules generating DC power in parallel within the communication cables, enabling efficient communication and power redundancy by minimizing the number of physical power lines and ensuring continuous power supply even with disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog signal lines are installed per basic unit to connect LOP, then communication between LOP and protection control module is achieved, but installation cost increases and maintenance becomes difficult
Solution Approach 1:
The patent combines multiple separate analog signal lines into a single serial communication cable that carries multiple data streams simultaneously. The integrated module aggregates communication with multiple protection control modules through one cable, eliminating the need for separate analog signal lines for each module and significantly reducing wiring complexity.
Solution Approach 2:
The serial communication cable serves multiple functions: it carries communication signals between the LOP and multiple protection control modules, provides power supply to distant LOPs, and enables both data transmission and power distribution through a single infrastructure, replacing multiple dedicated lines.
2Productivity
If digital LOP is used with serial communication function, then communication efficiency improves, but power supply becomes problematic for distant LOPs
Solution Approach 1:
The communication cable is designed to serve dual purposes: data transmission and power supply. By utilizing the existing serial communication infrastructure for power distribution, the system eliminates the need for separate power lines to distant LOPs, reducing installation complexity while maintaining power supply reliability.
Solution Approach 2:
The integrated module acts as an intermediary that receives power from the control room, converts and regulates it, then distributes it through the communication cable to distant LOPs. This intermediary function enables power delivery over long distances through the communication infrastructure.
3Device complexity
If single power line is used to supply power to LOPs, then installation is simplified, but power supply reliability decreases when disconnection occurs
Solution Approach 1:
The power distribution system dynamically adapts to failures by providing multiple power supply paths. When one power line or segment fails, the system can automatically switch to alternative paths through the redundant configuration, maintaining power supply continuity without requiring complex manual intervention.
Solution Approach 2:
The system incorporates redundant power supply lines and backup power sources in advance, so that when a disconnection or failure occurs, alternative power paths are already in place to maintain continuous operation without interruption.
4Reliability
If multiple separate power lines are installed for each LOP, then power supply reliability improves, but installation cost and complexity increase
Solution Approach 1:
Multiple power supply functions are merged into a single communication cable infrastructure. The cable that carries serial communication signals also carries power, eliminating the need for separate power lines for each LOP while maintaining reliable power distribution through the integrated module's power management.
Data Source
AI summary
The present invention relates to a motor control center system comprising an integrated module which is connected to multiple protection control modules through a first serial communication network and is connected to multiple LOP controllers through a second serial communication network, and communicates with a computer or a PLC in a main control room, wherein i) operation command transmission between the LOP controllers and the protection control modules and ii) measured-data collection, operational-state reporting, or control command transmission between the main control room or the PLC and the protection control modules are performed while the integrated module commonly intervenes therebetween; and commonly use the first serial communication network.