UniFi Access - Install Entrapment Protection Devices for License Plate Unlock Support

Importance of These Devices

Entrapment protection devices, also known as reversing safety sensors, are crucial for the safety of motorized gates. They prevent injuries and property damage by detecting objects or people in the path of a moving mechanism and then stopping or reversing the mechanism's motion. This ensures compliance with safety standards and provides users with peace of mind.

How They Work

An entrapment protection device detects obstructions and either stops or reverses movement to prevent entrapment. It reverses the mechanism's direction when an obstruction is detected, enhancing safety with automatic reversal. This type of device typically uses photoelectric beams, pressure-sensitive edges, or other detection methods to ensure safety.

UL 325 Standard for Safety

The UL 325 standard outlines the requirements for entrapment protection devices for automated door or gate systems, ensuring they are effective in preventing entrapment and injury. 

Learn more about UL 325 External Entrapment Protection Devices and UL 325 Gate Operators.

Common Device Types

According to the UL 325, entrapment protection device types vary based on gate classification and movement. They include:

• Inherent Entrapment Protection System: Stops and reverses the gate within 2 seconds.
• Non-Contact Photoelectric Sensor: Either stops or reverses the gate within 2 seconds.
• Contact Sensor (Edge Device): Stops and reverses the gate within 2 seconds.
• Adjustable Clutch or Pressure Relief Device: Stops the gate without exceeding 40 lbf stopping force, ensuring the gate stops safely without excessive force.
• Continuous Pressure Actuating Device: Requires ongoing pressure to open or close the gate; movement ceases when pressure is removed.
• Audio Alarm: Provides an audible warning for added safety.

If a motorized gate lacks a primary entrapment protection device, someone must physically hold the close button until the door closes entirely.

Requirement of Entrapment Protection Devices for License Plate Unlock Support

To ensure the proper functioning of the License Plate Unlock feature in the UniFi Access system, it is crucial that the UL 325 terminals on the third-party gate operator are correctly connected to and configured with entrapment protection devices. Without proper installation, License Plate Unlock will not operate correctly, meaning the gates will not open even if a vehicle's license plate numbers are detected and authorized for access.

Here are examples of the installation of entrapment protection devices for different types of gate-closing actions.

Single Driveway: Gate Closing Triggered Automatically by Connected Gate Operator

Suitable for sliding gates, single-leaf swing gates, double-leaf swing gates, and single-leaf barrier gates. Learn more

Double Driveway: Gate Closing Triggered Automatically by Connected Gate Operator

Suitable for bi-directional barrier gates for car lanes with two-way traffic. Learn more

Gate Closing Triggered Automatically by Gate Hub's Auto-Close Timer

Suitable for most gates, as long as they support both Full Open and Full Closed terminals. Learn more

Gate Closing Triggered Manually

Suitable for roll-up gates and garage doors that use a single button for both opening and closing actions. Learn more