Details about common access control cabling system errors

When using the access control system, we often encounter many problems and errors. Here I will give you a detailed introduction to four access control errors and solutions to these errors, hoping to help you, accumulated experience.

I. Common Errors in access control cabling systems
-- Use the wire distribution locks of the network to lock the wire to the Controller!

A line from the electric lock to the controller during Access Control Construction looks very ordinary. If the specification is not normal, it may cause a fault that is difficult to find the cause. This must be taken seriously! Because the electric lock current is relatively large, compared with other devices in the access control system, such as the controller card reader), the electric lock has a certain distance from the Controller, and the online pressure drop will be relatively large. If the pressure drop is too large, the locks are sometimes moved and sometimes not moved. Magnetic locks sometimes have insufficient suction. The door switch is abnormal. It may even compete with the Controller to seize the current resources, making the Controller unable to supply power, restart or even crash.

Some engineers can easily deploy cables or make procurement. It is very easy to use network cables to deploy cables to controllers. Although there seems to be no problem during debugging, after a while, problems may occur frequently.

From the electric lock to the Controller line, if the line length is less than 50 meters, the use of cross-sectional area of 1.0 mm² two-core power cord, no need to shield, if more than 50 meters, please cloth more than one two-core power cord, parallel power supply. If the wire length is greater than 100 meters, we recommend that you move the Controller closer to the door locks to shorten the wiring distance. The cross-sectional area of the network cable is 0.2 mm², which is five times smaller than our standard wire, so it is absolutely impossible, even if the distance from the Controller to the electric lock is very close. Power lock door magnetic signal line, can use a network cable. Some people, the four-in-one shares of the network cable, power the electric lock, although theoretically close to specifications, but it is not recommended that you do this. This will cause other potential risks, such as unstable wiring terminals.

Ii. Common Errors of access control Cabling System II
-- Excessive power load! The main manifestation is that there are too many locks! Power configuration suggestions for access control systems
The standard power supply provided by the company is 12 V, 5A linear power supply. He can meet the wiring specifications, the cross-sectional area is thick enough) a maximum of four doors, four plug locks or three magnetic locks) power supply. A pair of double-door magnetic locks is converted into two single-door magnetic locks. If the system exceeds this configuration, for example, four or more plug-ins or three or more magnetic locks, an additional power source and the original power supply need to be allocated for power supply. Note: If the power of some locks is too high, the power supply will be weaker than the power supply.

If the power supply is insufficient, it may not be displayed during debugging unless it is insufficient. It is manifested in the fact that sometimes the door is locked, sometimes it cannot be locked, or even the current is snatched from the Controller, making the Controller restart or even crash.

Because the effective power of the linear power supply is not high, the heat is usually the effective power ranging from 40 to 70%, the nominal 5A power supply, the effective current is about 3A. However, the linear power supply runs stably and has little interference, so it is suitable for devices that run stably for a long time. It is a power supply widely used by access control devices at home and abroad. Some Engineering vendors may ask if they can use a switching power supply. The switching power supply has a high power and the effective power is high. We do not recommend using a switching power supply. The switching power supply usually has a high frequency ripple, will affect the stability of the host operation.

Iii. Common Errors of access control cabling system III
-- 485 lines do not use twisted pair wires, or use low-end passive converters! 485 the communication line must follow the standard hand-in-hand bus mode. If 485 is out of specification or beyond the communication range, communication fails or sometimes fails.

485 transmission is a differential mode transmission mode. Only 485 + and 485-are mutually twisted to minimize the interference of 485 transmission mode. The transmission is the farthest, and the transmission quality is the best. Some Engineering engineers do not use twisted pair wires, which can cause great interference. Some Engineering engineers mistakenly think that the transmission quality of rough lines will be good, and the twisted pair wires will be merged into one strand, And the other twisted pair wires will also be merged into one strand, Which is counterproductive, this greatly reduces the communication quality.

There is a small converter with no power supply available on the market, and the price is cheap. However, anti-interference performance is poor. It is generally used for indoor short-distance communication between a single machine, such as a attendance machine. Not suitable for access control systems. Although it claims to be able to carry 32 devices with a transmission distance of 1000 meters, it is often far from reaching the index in practical applications. Therefore, we recommend that you do not use this Passive Converter. Unless in the room, the communication distance is less than 100 meters, and the number of loads is less than two. You can consider the cost. Otherwise, we strongly recommend that you use an active 485 converter at a much more stable price. The number of load controllers is also large. Anti-interference, anti-lightning, and anti-surge effects are also good.

485 star connections are prohibited from wiring, that is, the transformer cannot be separately pulled from the transformer to various controllers, and then connected in parallel on the transformer. This connection causes poor communication quality. The converter must first come to a controller, and then connect to the next controller. One controller can connect to the next controller, just like a string of grasshoppers. Non-standard 485 wiring, even if the future use of shield grounding terminal resistance to improve is useless.

Iv. Precautions for Common Access Control cabling system errors
-- Other considerations
1. Without consultation and understanding, you can connect some non-access control system equipment, such as automatic doors or elevators, even different manufacturers of the same equipment have different electrical characteristics. If you are not familiar with these features, it will easily cause instability of the access control system and cause a lot of interference, therefore, before connecting external devices, please communicate with the technical staff of the access control manufacturers to gain some experience and enhance familiarity with the electrical performance of external devices, and the improvement and accumulation of the engineer's own technical experience.

2. When the customer sometimes mentions replacing this product with other products, the line has been laid out. If the line cannot meet the requirements of the specifications, the line must be reconfigured and will be used if the standard cannot be lowered. Now, saving time or luck will inevitably make the future work very costly and energetic.

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