What is Electric Lock
Electric locks are connected to a door access control system, include: electric bolt, electric strike, magnetic lock, electromagnetic lock.
Electric Bolt:
Fail-Safe electric lock – to achieve human safety: The lock will be released when the power shuts down. In fire, the building will automatically cut off power supply, so the electric bolt should be released to facilitate the evacuation.
Four-wire electrical plug lock
Electric bolt may be classified by the wire inserted into the lock they are divided into: 2 wires electric bolt, 4 wires electric bolt, 5 wires and 8 wires electric bolt etc.
2 wires electric bolt: There are two wires, red and black, red wire conected to +12 VDC power supply and black wire conected to GND. Disconnect any one line, retracts the lock, the door opened. There is no single chip control circuit, the lock easy to heat hot, low cost.
4 wires electric bolt: There are two wires, red and black, red wire conected to +12 VDC power supply and black wire conected to GND. There are two white lines, is door sensor signal line, reflecting the doors on and off state. 4 wires electric bolt controller using microcontroller, fever benign, with a delay control, with door sensor signal output, is a good cost-effective common type electric lock.
Power door lock delay setting plug
5 wires electric bolt: Same as 4 wires electric bolt, but more magnetic state, for some special occasions.
8wires electric bolt: Same as e same 4 wires electric bolt, but more output of the lock status.
Electric bolt usually used in glass doors, wooden doors and so on.
Advantages: hidden security, beautiful appearance, safety, and not easily forced open and opened.
Disadvantages: to dig keyhole installation, more hard work.
Electric Strike:
An electric strike is an access control device used for doors. It replaces the fixed strike faceplate often used with a latchbar (also known as a keeper). Like a fixed strike, it normally presents a ramped surface to the locking latch allowing the door to close and latch just like a fixed strike would. However, an electric strike's ramped surface can, upon command, pivot out of the way of the latch allowing the door to be pushed open (from the outside) without the latch being retracted (that is, without any operation of the knob) or while exited the knob or lever can be turned to allow egress from the secured area.
Electric strikes generally come in two basic configurations:
Fail-secure: Also called fail-locked or non-fail safe. In this configuration, applying electric current to the strike will cause it to open. In this configuration, the strike would remain locked in a power failure, but typically the knob can still be used to open the door from the inside for egress from the secure side. These units can be powered by AC which will cause the unit to "buzz", or DC power which will offer silent operation, except for a "click" while the unit releases.
Fail-safe: Also called fail-open. In this configuration, applying electric current to the strike will cause it to lock. In this configuration, it operates the same as a magnetic lock would. If there is a power failure, the door would open merely by being pushed/pulled open. Fail safe units are always run using DC power.
Magnetic Lock, Electromagnetic Lock:
A magnetic lock also called electromagnetic lLock is a simple locking device that consists of an electromagnet and armature plate. By attaching the electromagnet to the door frame and the armature plate to the door, a current passing through the electromagnet attracts the armature plate holding the door shut. Unlike an electric strike a magnetic lock has no interconnecting parts and is therefore not suitable for high security applications because it is possible to bypass the lock by disrupting the power supply. Nevertheless, the strength of today's magnetic locks compares well with that of conventional door locks and they cost less than conventional light bulbs to operate. Power supplies incorporating a trickle-charged lead-acid battery pack can be used to retain security for short-term power outages.
An electromagnetic lock is characterized by its holding force:
Micro Size: 300 lbf (1,300 N) holding force.
Mini Size: 600 lbf (2,700 N) holding force
Midi Size: 800 lbf (3,600 N) holding force
Standard Size: 1,200 lbf (5,300 N) holding force.
Application modes:
For safety purposes an electric lock has two modes:
Fail-Safe – to achieve human safety: The lock will be released when the power shuts down.
Fail-Secure – to achieve property safety: The lock remains closed when the power is shut down.
An electromagnet lock is used for Fail-Safe applications, and the lock should satisfy the specifications in fire regulations to be safe in emergency situations.
Installation: The magnetic lock should always be installed on the inside (secure side) of the door. Installation is as simple as installing on the header of the door frame for out-swinging doors or using a Z-bracket for in-swinging doors. It is important to make sure the armature plate and the electromagnet align as closely as possible to ensure efficient operation. Magnetic locks are almost always part of a complete electronic security system. Such a system may simply consist of an attached keycard reader or may be more complex involving connection to a central computer that monitors the building's security. Whatever the choice of locking system, fire safety is an important consideration.
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