12V3A Access Control Power Supply:

Usage:

Plug the access control power supply into a 220V AC socket, and then connect the power output line to the power input of the access control system.

Advantages:

1. Stable output voltage and current can ensure the normal operation of the access control system.

2. With overload protection, overcurrent protection, short circuit protection, and other features, it can protect the safety and stability of the access control system.

Principle of use:

The access control power supply converts 220V AC to 12V DC and then outputs it to the power input of the access control system. The access control system uses the energy provided by this power supply to drive various components of the access control device to work.

Applicable environment:

The 12V3A access control power supply is suitable for access control systems, access control controllers, access control card readers, and other access control devices. It is also suitable for other devices that require 12V DC power.

How much power is suitable for choosing a power supply?

Most of the access control systems use a 12V DC power supply, so the power of the power supply can be evaluated through the rated current parameters of the power supply. Considering impact resistance and long-term stable operation, the following suggestions are made:

If a linear power supply is selected, it is recommended to choose a nominal 5-7A linear power supply if an access control panel is equipped with 4 electric plug locks for calculation. If a linear power supply is selected, it is recommended to choose a linear power supply with a nominal rating of 3A or more if a controller is equipped with one Electric Bolt locks for calculation. If you choose a switching power supply, if a controller is calculated with 4 electric plug locks, it is recommended to choose a nominal 4-5A switching power supply. If you choose switching power supply, if a controller is equipped with 1 electric mortise lock, it is recommended to choose a switching power supply with a nominal rating of 3A or more. If a controller has 8 electric plug locks or 6 magnetic locks, it is recommended to choose a switching power supply above 10A.

Precautions: 

For power supply selection, the larger the power and rated current, the better, and there will be no major side effects. If it is lower, it will not work. In the market, there are many irresponsible power supply manufacturers who falsely mark up the rated current and power of their products. Therefore, it is recommended that you buy a branded power supply.

The power supply is the basis for ensuring the stable operation of the entire access control system. The selection of the power supply can directly determine whether the engineering company can earn as much profit as possible when implementing the project. At the same time, the selection of the power supply can also reflect the project supplier's own ability to control the quality of the project.

When we investigated the macro market of access control, we found that more than 90% of system failures were caused by the improper selection of power supply, and some failures may have affected the smooth promotion of the project. On the whole, the failure caused by the power supply is mainly manifested in the following aspects:

① After using for a period of time, there is a fault phenomenon of insufficient power supply;

② After a thunderstorm, a large-scale power failure occurs;

③ Power failure occurs in hot and cold weather;

④ The battery is often broken, and it does not have the ability to maintain the normal operation of the system when the power is cut off;

⑤ The short circuit of the line causes the power supply to be burned out;

⑥In the peak period of electricity consumption, there is a problem of insufficient power supply.

The connection terminals of the special power supply for access control generally include the following: power output +12V, power output GND, switch control signal input push, electrical signal control input control+ and control-, normally closed electric lock control output NC, Normally open electric lock control output terminal NO, where the power output terminal +12V and power output terminal GND are connected to the +12V and GND of the access controller or all-in-one machine;

The power supply output terminal GND and the switch control signal input terminal push are connected to the door open button and the door open switch signal output by the access control. Note that this interface can only be connected to a pure switch signal. If the signal has power, it will be troublesome. The control part of the power supply may be blocked. burn. Sometimes several devices are required to control the electric lock at the same time, as long as the pure switch signal can be directly connected in parallel to achieve common control; the electric signal control input terminals control+ and control- are connected to the electric signal for controlling unlocking output by the access control or building intercom, if the device If the control output is an electrical signal, use these two ports, and the voltage must be between 5-12V;

The power supply output terminal GND and the switch control signal input terminal push are connected to the door open button and the door open switch signal output by the access control. Note that this interface can only be connected to a pure switch signal. If the signal has power, it will be troublesome. The control part of the power supply may be blocked. burn. Sometimes several devices are required to control the electric lock at the same time, as long as the pure switch signal can be directly connected in parallel to achieve common control; the electric signal control input terminals control+ and control- are connected to the electric signal for controlling unlocking output by the access control or building intercom, if the device If the control output is an electrical signal, use these two ports, and the voltage must be between 5-12V.

Author: Written by Anna Zhang He from S4A INDUSTRIAL CO., LIMITED