Common fault analysis and troubleshooting methods of access control system and magnetic lock

Magnetic lock works according to the principle of electromagnet. After power is turned on, a large magnetic force will be generated as long as there is a small current. After the access control system recognizes the correct person, the magnetic lock will lose its magnetic force and the door can be opened by cutting off the power supply.

After using the magnetic lock for a period of time, some problems will occur due to various reasons. What should we do in the face of these faults? Common magnetic lock faults and solutions are shared with everyone.

1. The magnetic lock makes a loud sound when closing the door

a. Check whether there is a rubber gasket installed;

b. Check the iron plate end and whether the screws are too loose;

c. Check whether the distance between the magnetic lock body and the suction plate is appropriate.

2. The iron plate is not firmly sucked

a. Check whether the "power and voltage" 1A/12V/24V output of the power supply is reduced;

b. Check whether there are foreign objects on the surface of the magnet (such as dust, rust, foreign objects, etc.).

3. The iron plate of the magnetic lock needs to be adjusted frequently

a. Check whether the iron plate is equipped with pins;

b. Check whether the iron plate is equipped with rubber pads;

c. It is recommended that customers apply "screw fixing agent" to the screws.

4. After the iron plate is sucked, it feels a slight vibration

a. Check whether the main surface of the magnetic lock and the iron plate are completely sucked and there are no foreign objects, or loosen the iron plate and try it;

b. Check whether the voltage and current are sufficient;

5. The delay function is invalid

a. The "delay adjustment" of the magnetic lock starts timing after power is turned on, not after closing the door;

6. After power is turned on, the LED light is slightly bright and cannot be sucked

Check the voltage Is it enough to supply the electromagnetic lock requirements (1A current/12V voltage should be supplied).

7. After power on, the red LED light is always on, but the green light is not on

a. There are foreign objects on the iron plate and the surface of the lock body, which is unclean.

b. Is the lock body installation too far away?

8. The double-door magnetic lock cannot be sucked after being used for a period of time

The double-door magnetic lock consumes a lot of power. Check whether the power supply is sufficient (whether it is sufficient to meet the required current and voltage of the double-door electromagnetic lock, or whether there is line loss).

9. The controller does not work

Check whether the controller "output" contact is correct.

The above are the nine common faults and solutions of access control magnetic locks. In actual use, specific problems must be analyzed specifically.

10. FAQs of access control system

1. Power supply:

Ensure sufficient power, try to use linear power supply, and the door lock and controller should be powered separately. The power supply should be installed as close to the electrical equipment as possible to avoid interference and transmission loss.

2. Wiring:

Divided into power cord, communication When wiring, pay attention to separate strong and weak current lines, and the distance between the two pipes should be greater than 20cm.

Power line: The wire diameter is thick enough, and multi-strand wires are used.

Signal line and communication line: Use shielded Category 5 twisted pair. Among them, the 485 bus must be connected using a pair of twisted wires. When purchasing wires, it is recommended to use 4*0.5 four-core shielded wires.

Pay attention to the following points:

1. Shielded wires must not be used as connecting wires for 0V voltage (power ground)

2. Each shielding loop can only have one grounding terminal

3. When the shielding loop cannot be grounded, the shielding wire can be connected to another shielding loop of the network.

4. The signal grounds of each module must be connected together.

5. If there is a breakpoint in the middle of the line, the breakpoint must be soldered with a soldering iron and insulated.

6. Do not put the network connection line together with the AC power supply.

7. If the network connection exceeds 1000 meters, add a repeater, which can be extended by another 1000 meters after the repeater.

3. Pay attention to the selection of installation location to prevent electromagnetic interference.

1. Card reader: Do not install on metal objects. The distance between two card readers should not be less than 30 cm. Try to power it through the controller. If the card reader is powered from the outside alone, use a linear voltage regulator (transformer) for the power supply of the card reader, and do not connect the negative pole of the DC to the ground terminal of the AC.

2. Network adapter: The connection between the network adapter and the controller should be hand-in-hand.

3. Controller: For controllers without isolation, it is recommended to use the same power supply.

4. Lock: When installing a magnetic lock, make sure that the lock body and the relay plate can be tightly combined, otherwise there will be insufficient suction. For electric bolt locks, if you need to open a socket when installing an electric bolt lock, pay attention to the hole diameter must be large enough and the depth must be deep enough to allow the lock tongue to be fully inserted. If the lock tongue cannot be fully inserted, the lock tongue will keep jumping or the working current will be very large after locking the door, and the lock body will become hot.

Common faults and repair methods of access control system

I. Valid card cannot open the door

1. Check whether the electric lock is normal. Check the power supply or replace the electric lock

2. Whether the lock tongue and lock buckle are mechanically stuck. Repair mechanical faults or replace parts

3. Check the indicator light on the control panel and whether the communication between the control panel and the module is normal. Troubleshoot

4. Check whether the communication between the card reader and the module is normal. Troubleshoot

5. Whether the information day closing command is set and the door opening time is adjusted through the software

6. Whether the operator initializes the access control system or other commands are re-authorized through the software

II. Access control communication is not connected

1. Check whether the serial port is set incorrectly (determine the serial port used)

2. Check whether the access control communication bus is short-circuited or open-circuited (eliminate short-circuit and open-circuit phenomena of the communication line)

3. Check whether the communication chip 75184 of the RS485 communication card is damaged (replace the communication chip 75148)

4. RS485 communication card is damaged (Replace RS485 communication card)

5. Check whether the network cable crystal head is in place, check whether the network cable is connected, and ping the address of the access control controller

3. Access control records cannot be fully extracted

Clear the access control controller and reload the time

4. The card reader LED indicator is always green, the card is not read, the door lock is always open, and the communication is normal

1. The operator sets the access control status to normally open, or other reasons cause the controller to be in the normally open state;

2. Controller failure. Solution: Set the door lock controller status to normal. If the fault phenomenon still exists, replace the controller.

5. IC card cannot be read

1. The IC card has been set for valid reading time period when the IC card is authorized (it can be set for valid reading all day)

2. The access control controller is abnormally hot (replace the access control motherboard)

3. Access control read-write antenna (adjust the fine-tuning capacitor to increase the card reading distance)

6. The communication between the computer and the controller is unstable

Possible reasons:

1. The signal line that does not meet the requirements or the signal line of inferior quality is used;

2. The signal line is not laid in a standardized manner, such as the signal line and the power line are in the same pipe;

Summary of ten common fault problems of access control system locks

1 Question: Why is the magnetic lock loud when closing the door?

Answer: a. Check whether there is a rubber gasket installed.

b. Check the iron plate end and whether the screws are too loose.

c. Check whether the distance between the magnetic lock body and the suction plate is appropriate.

2Q: Why can't the iron plate be firmly attached after the magnetic lock has been used for a period of time?

Answer: a. Check whether the "power and voltage" 1A/12V/24V output of the power supply is reduced.

b. Check whether there are foreign objects on the surface of the magnet (such as dust, rust, foreign objects, etc.).

3. Q: Why does the iron plate of the magnetic lock need to be adjusted frequently?

A: a. Check whether the iron plate is equipped with pins.

b. Check whether the iron plate is equipped with rubber pads.

c. Suggest customers to apply "screw fixing agent" to the screws.

4. Q: After the iron plate is sucked, it feels a slight vibration and the suction is insufficient?

A: a. Check whether the main surface of the magnetic lock and the iron plate are completely sucked and there are no foreign objects, or loosen the iron plate and try it.

b. Check whether the voltage and current are sufficient. The DC power supply contains AC signals.

5. Q: Why does the magnetic lock have a delay adjustment, but it is ineffective?

A: a. The "delay adjustment" of the magnetic lock starts timing after power is turned on, not after the door is closed.

6. Q: Why is the magnetic lock powered, but the red LED light is slightly bright and cannot be sucked?

A: Check the voltage Is it enough to supply the electromagnetic lock requirements (1A current/12V voltage)?

7Q: Why is the magnetic lock powered on and attracted, but the red LED light is always on, but the green light is not?

A: It may be that the sensing element of the magnetic lock is damaged and needs to be replaced. Or the iron block is installed too far away from the lock body and needs to be adjusted.

8Q: Why can't the double-door magnetic lock be attracted after a period of use?

A: The double-door magnetic lock consumes a lot of power. Check whether the power supply is sufficient (whether it is sufficient for the required current and voltage of the double-door electromagnetic lock, or whether there is line loss).

9Q: Why does the magnetic lock not work with the controller?

A: Check whether the "output" contact of the controller is correct.