Fire Panel to Elevator Controller Interface Bypass Relay
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Solution Overview
Problem
Current interfaces between fire panel equipment and elevator controllers lack a reliable method for safe independent testing, often resulting in forgotten or improper reconnection of wiring, which can lead to unintended elevator operation during emergencies.
Innovation Solution
An interface with action and bypass relays that allows for logical disconnection and reconnection of fire alarm and elevator systems, providing automatic alerts and a historical log of testing activities, ensuring safe and proper system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical disconnection of wiring is used to isolate fire alarm panel from elevator controller during testing, then testing can be performed independently, but reconnection may be forgotten or improper leading to system failure
Solution Approach 1:
A bypass relay is introduced as an intermediary component between the fire alarm panel and elevator controller. This relay acts as a controlled switch that can be activated to disconnect signals during testing or deactivated to restore normal operation, eliminating the need for manual wiring disconnection while ensuring reliable reconnection through automatic control.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the state of the bypass relay and system connections. This feedback ensures that the bypass condition is properly established during testing and automatically restored when testing is complete, preventing forgotten disconnections and providing status indication to operators.
2Adaptability or versatility
If bypass programming is used to isolate fire alarm panel from elevator controller, then testing can be performed, but elevator control relays cannot be tested
Solution Approach 1:
The testing capability is segmented into separate controllable functions. The bypass relay can be independently activated to test fire alarm panel functionality, while the elevator controller and its relays remain accessible for separate testing. This segmentation allows both systems to be tested independently without requiring complex programming configurations.
3Reliability
If physical wiring disconnection is used for testing, then independent testing is possible, but system reconnection requires manual intervention and verification
Solution Approach 1:
The bypass relay is pre-configured and positioned in the circuit before testing begins. When testing is complete, the relay can be immediately deactivated to restore connections, eliminating the time-consuming process of manual wiring reconnection and verification. The pathway for reconnection is already established, requiring only a simple control action.
Data Source
AI summary
A system and method for logically disconnecting fire alarm equipment from elevator control equipment to enable independent testing of each equipment set. The system and method may include an interface having a fire alarm equipment side and an elevator control side which are interconnected by a plurality of relays. A plurality of action relays may be associated with specific functions of the elevator controller. A plurality of bypass relays are interposed between the action relays and the elevator controller so that when a “bypass” operation is initiated, the bypass relays prevent signals from the action relays from reaching the elevator controller. As such, the action relays can be tested without impacting ongoing elevator operations. In addition, the logical disconnection arrangement ensures proper functioning of the system once testing is completed.