Multi-Input Module for Motorized Gate Safety Sensors
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Solution Overview
Problem
Motorized gate operators often have fewer input ports than the number of obstruction detection devices required, making it difficult to monitor and control multiple edge and photo eye sensors, which is a challenge due to updated safety standards like UL 325 and ASTM F2200 that demand increased entrapment area protection.
Innovation Solution
A Multi-Input Module (MIM) that uses a microprocessor-based firmware to recognize and manage multiple edge and photo eye sensors by automatically identifying different signaling types and generating appropriate output signals, allowing existing gate operators with limited inputs to monitor and control multiple protection devices, including edge switches and photo eye sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of obstruction detection devices is increased to meet safety standards, then safety compliance is improved, but the number of input ports required increases beyond what existing gate operators provide
Solution Approach 1:
The patent combines multiple sensor input channels into a single integrated interface module that connects to the gate operator through one or a few input ports. The module internally multiplexes signals from multiple edge switches and photo eyes, allowing several obstruction detection devices to be monitored through a unified communication interface rather than requiring separate physical input ports for each device.
Solution Approach 2:
The patent introduces an intermediate interface module that acts as a mediator between the multiple obstruction detection devices and the gate operator's limited input ports. This intermediary device receives signals from multiple sensors, processes them according to safety standards, and communicates with the gate operator through a standardized protocol, thereby bridging the gap between numerous sensors and limited input ports.
2Reliability
If multiple edge switches and photo eyes are monitored, then entrapment area protection is improved, but the complexity of monitoring and controlling these devices increases
Solution Approach 1:
The interface module performs self-configuration and automatic identification of connected sensors. When sensors are connected to the module, it automatically detects their types, assigns them to appropriate entrapment zones, and configures monitoring parameters without requiring manual setup. This self-service capability reduces the complexity of system configuration and maintenance while maintaining comprehensive entrapment area protection.
Solution Approach 2:
The patent designs a universal interface module that can handle multiple types of obstruction detection devices (edge switches, photo eyes, other sensors) through a single standardized interface. The module provides multi-functional capabilities including signal conditioning, fault detection, zone assignment, and communication with the gate operator, thereby simplifying the monitoring and control of diverse sensors across all entrapment areas.
3Ease of manufacture
If existing gate operators are used without modification, then installation cost is reduced, but the ability to support multiple sensors is limited
Solution Approach 1:
The patent segments the sensor interface functionality into a separate, standalone module that can be added to existing gate operators without modifying the operator itself. This segmentation allows the interface module to be independently designed, configured, and installed, preserving the original gate operator while adding enhanced multi-sensor support capability through a modular addition.
Data Source
AI summary
A system and method which allows automatic recognition of any of three common monitored motorized door or gate safety edges or other entrapment protection devices. The invention allows retrofitting existing motorized door operators without enough monitored input ports to allow for more monitored entrapment devices required on laterally moving motorized gates. The system interfaces with obstruction monitoring devices in normally closed, pulsed, or resistive termination operating environments found in entrapment protection systems. Firmware logically analyzes the state of each edge or entrapment protection device to select and direct an appropriate output signal for a motorized gate operator. An operational example is disclosed which provides for up to six different device inputs and two separate outputs for the motorized door operator, which can be configured through dual inline package switches allowing field configuration.