Basic Magnetic Door Lock System

Electromagnetic Locks

Electromagnetic locks are widely used in commercial and industrial applications. The lock is usually mounted on the header above the door and the armature is usually mounted on the door (see drawing below). Different arrangements can be made for inswing or outswing doors, and different holding forces, monitoring switches, and other variations and options are available. In this article I will discuss only the basics.

As with any locking system, use of electromagnetic locks may be restricted by local authorities such as your local building inspector and/or fire marshall. It is wise to check with these authorities before installing an electromagnetic lock.

System Overview

To install the most basic electromagnetic locking system on an out-swinging hollow metal commercial door and frame you need the following:

  1. The electromagnetic lock
  2. A way in
  3. A way out
  4. A power supply

The electromagnetic lock is an appliance. It unlocks when you shut off the power. Therefore the means of entry and egress will be swtiches of some form or other.

Means of entry could be:

  • A key switch
  • An access control device like a card reader or keypad
  • A remote as for a garage door opener

Your choices for means of egress are limited by national, state and local life safety code. They could be:

  • A mechanical push bar with a mechanical switch inside
  • A pushbutton with pneumatic time delay clearly marked "Push to Exit" right next to the door
  • An exit sensor with redundant pushbutton

Your local Authority Having Jurisdiction (AHJ) may require that your power supply be connected to the building fire alarm so that in the event of an alarm, the panel can unlock the electromagnet. In any case you need a power supply with sufficient capacity to power your electromagnet.

System Examples

A simple electromagnetic locking system using products by Schlage Electronics might include:

  • 1 each 390+ electromagnetic lock
  • 1 each 505 power supply
  • 1 each 653-05 key switch
  • 1 each 621RD EX DA exit pushbutton

View these products at http://www.locknetics.com/

A simple electromagnetic locking system by Securitron might consist of:

  • 1 each M62 electromagnetic lock
  • 1 each BPS-24-1 power supply
  • 1 each DK-26SS keypad
  • 1 each XMS exit sensor
  • 1 each EEB2 redundant exit pushbutton

View these products at: http://www.securitron.com/

Simple Wiring Diagram

Basic mag wiring diagram
Basic mag wiring diagram

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Comments 12 comments

himachal profile image

himachal 8 years ago from himachal

very informative hub


Mohan 5 years ago

Good info! Thanks.


ronald@natalia@db.com 4 years ago

Hi,

do you have a diagram which shows the reader on both sides of the door and data connection and how it looks like so I and our supplier can understand each other?


Tom Rubenoff profile image

Tom Rubenoff 4 years ago from United States Author

The diagram would depend on what reader and system you are using. You mention a data connection, so I suggest you start at the HID web site located here:

http://www.hidglobal.com/technology.php?tech_cat=1...


vic 3 years ago

I would like to see a diagram of wiring for a single magnetic door lock system with connections to power supply, on-off switch,exit button and magnet at door.


Tom Rubenoff profile image

Tom Rubenoff 3 years ago from United States Author

Well, you know, they are not hard to find:

http://www.sdcsecurity.com/system-library.htm


redgarlic73 3 years ago

i would like to request to your company a wiring diagram from automatic door going to biometric lock with sensor.thanks


Tom Rubenoff profile image

Tom Rubenoff 3 years ago from United States Author

A biometric lock is simply a switch that opens and closes a circuit. Think of it as an actuator for the automatic door. Usually the automatic door will have inputs for actuators and sensors, or a separate relay may coordinate these components. Here is a link to BEA's download page where you will find many wiring diagrams. Thinking of the biometric lock as an actuator, you should be able to use one of these diagrams.

http://www.beainc.com/beainc/Downloads/Download.ph...


toptenluxury profile image

toptenluxury 3 years ago from Cedartown, GA

I think that I'm going to get one of these. There is nothing like feeling protected. Voted up!


Tom Rubenoff profile image

Tom Rubenoff 3 years ago from United States Author

Thanks for the vote up, Toptenluxury!


nn 2 years ago

Is it possible to arrange it so the door opens both ways in case of a fire?


Tom Rubenoff profile image

Tom Rubenoff 2 years ago from United States Author

Yes, if one uses a magnetic shear lock that is installed concealed in the door and header with a power supply that has a fire alarm interface that is connected to the fire alarm. Web search GF3000 to see an example of the shear lock and ALT175ULX for a power supply with fire alarm interface.

Of course, before you begin, the door must already swing both ways. One consideration is that the door must work very well so that the mag lock lines up consistently.

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