Understanding Access Control Dry Contact and Armature Plate
Introduction
In access control systems, dry contact and armature plates play crucial roles in securing doors and managing access. Understanding their functionality is essential for effective system design and operation.What is Dry Contact?
A dry contact is an electrical connection that does not carry any voltage or current when open. When the contact is closed, a circuit is completed, allowing current to flow. In access control, dry contacts are used to trigger various actions, such as powering locks or sounding alarms.
How is Dry Contact Used in Access Control?
In access control systems, a dry contact is connected to an access controller. When an authorized user presents a credential (e.g., key fob, PIN) at a reader, the access controller sends a dry contact signal to the lock's power supply. This signal activates the lock's solenoid, engaging the armature plate and unlocking the door.
What is an Armature Plate?
An armature plate is a metal plate that is attached to the lock's solenoid. When the solenoid is energized, it pulls the armature plate into its coils, creating a magnetic field. This magnetic field interacts with the metal washer of the lock's strike plate, holding the door securely closed.
How is an Armature Plate Used in Access Control?
The armature plate plays a dual role in access control. First, it converts the electrical energy from the solenoid into mechanical energy, actuating the lock. Secondly, it acts as a hardened steel surface that prevents intruders from prying the door open with brute force.
Conclusion
Dry contact and armature plates are fundamental components of access control systems. By understanding their functionality and how they work together, you can optimize the security and efficiency of your building's access control system.
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