Hot Cutover Box for Seamless Controller Migration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for migrating a final control element from one controller to another in industrial process control systems often disrupt the operating variable, requiring cumbersome manual adjustments and verbal communication, or allow no adjustments at all during the migration process.
Innovation Solution
The development of a hot cutover box that uses a combination of milli-ammeters, connectors, and electronic components to create an electronic virtual bypass, allowing for seamless signal migration between existing and new process controllers without disrupting electrical continuity, utilizing Hall Effect sensors and isolation circuits to ensure matching signals and polarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If block and bypass valves are used for controller migration, then manual control is possible during migration, but the process is cumbersome requiring verbal communication between control room and field operators
Solution Approach 1:
The patent introduces a hot cutover box as an intermediary device between the controller and final control element. This box contains a switch that can be remotely actuated to transfer the control signal from the old controller to the new controller without requiring field operator intervention or verbal communication, thus simplifying the migration process while maintaining control capability.
Solution Approach 2:
The patent replaces the mechanical block and bypass valve system with an electronic switching mechanism in the hot cutover box. Instead of manually operating valves and maintaining pneumatic connections, the system uses electronic signal switching that can be remotely controlled, eliminating the need for complex mechanical arrangements and manual coordination.
2Reliability
If pneumatic boondoggle is used for controller migration, then signal continuity is maintained during migration, but the method requires cumbersome verbal communication between operators
Solution Approach 1:
The hot cutover box serves as an intermediary that maintains signal continuity through its internal switching mechanism. The box remains connected to both the old and new controllers, allowing seamless signal transfer without requiring the complex pneumatic boondoggle arrangement or coordinated manual operations between control room and field operators.
Solution Approach 2:
The patent extracts the switching function from the complex pneumatic boondoggle system and consolidates it into the hot cutover box. This isolation of the switching function simplifies the overall system, maintaining signal continuity while eliminating the need for cumbersome manual operations and verbal communication protocols.
3Reliability
If mechanical stem clamp is used for controller migration, then no adjustment to final control element is needed, but no adjustments can be made to the final control element during migration
Solution Approach 1:
The hot cutover box provides a dynamic switching capability that allows the system to adapt during migration. The switch can be remotely actuated at any time during the migration process, enabling adjustments to the final control element if needed, while maintaining position stability when the switch is in a fixed position. This eliminates the need for permanent mechanical clamping that prevents all adjustments.
4Productivity
If traditional migration methods are used, then controller migration can be performed, but disruption to operating variable occurs during migration
Solution Approach 1:
The hot cutover box is pre-installed in the control circuitry before migration begins, with the switch already positioned to receive signals from the old controller. This preliminary setup allows for rapid switching to the new controller without interrupting the signal flow to the final control element, thus maintaining operating variable stability while enabling quick migration.
Solution Approach 2:
The hot cutover box maintains continuous signal flow to the final control element throughout the migration process. The switch within the box ensures that the control signal is continuously transmitted from either the old or new controller without interruption, allowing rapid migration while preventing disruption to the operating variable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables a bumpless and efficient hot cutover process, reducing the migration time to a few milliseconds, with the ability to adjust the final control element during migration, thereby minimizing disruptions and improving operational efficiency.
Implementation Method 1
utilizing Hall Effect sensors and isolation circuits to ensure matching signals and polarity
Data Source
AI summary
The disclosed hot cutover box creates an electronic virtual bypass around a terminal strip to which existing control system, new control system, and final control element connections may be made, thereby allowing migration from an existing to a new control system to take place. Sensors allow measurement of a current signal without disrupting electrical continuity and connectors allow the hot cutover box to be introduced to the circuit with no disruption to the controller output. Once the hot cutover box is in place, wiring connections can be removed from the terminal strip as the hot cutover box effectively provides a parallel current pathway around the terminal strip.