Access Control System Moisture and Lightning Protection and High and Low Temperature Testing

The traditional access control applications are generally relatively high-end applications, either government agencies or high-end office buildings, and most of the installations are indoors. The sun is not big, the rain is not enough, and even the air conditioner "waits." The use of video access control: outdoor installation, high-temperature exposure, low temperature attack, lightning interference, moisture, voltage instability in the village, reader installed on the iron gate, etc. These all subvert the traditional application of access control system reliability The request.

1, lightning protection

Because the traditional access control system is an indoor installation, lightning protection is generally done on the roof of the building, and the lightning protection level does not need to be too high. The video access control project is often installed outdoors. During the networking, power lines, signal lines, and communication lines are inevitably routed outdoors. This route is the main route to mine. Therefore, the key to the reliability of the video access control system is the performance of lightning protection. According to the author's rough estimate, many video access control projects that were not successful in Shenzhen were caused by insufficient lightning protection performance. Measured down, the lightning protection level of the equipment needs more than four levels to meet the standards. (Note) The selection of equipment in video access control involves the need for lightning protection products: access controllers, power supplies, optical transceivers, cameras, hard disk recorders, etc.

Selection test method:

For the user, it is difficult to intuitively determine whether a product is made lightning protection, and there is also a lack of a professional testing system. From the actual situation, the author provides several simple but effective methods of judgment:

Use the electric baton to directly shock the various types of ports that the device may draw in, the power port, the signal line port, and the network port. If you strike a product that is a bad one, consider it carefully when you choose it.

Understand whether manufacturers have ample cases of high requirements for product lightning protection reliability. It is advisable to visit the field and visit them. This may seem like a hassle, but it's still worth comparing with if you choose a wrong product.

2, moisture-proof

The moisture protection is mainly aimed at the video access control projects in the southern region. People who spent time in the south must have been deeply impressed by the "back-south days" where the walls are congealed. Many home appliances are easily damaged and damaged if they are not properly protected. In projects such as video access control, because the control is the entry and exit of personnel, if the selection of equipment does not take into account the moisture-proof performance, it can easily affect the stability of the system. Affect people's access. In general, the moisture protection of video access control should pay attention to two aspects. First, the circuit board of the equipment must be protected against moisture, and on the other hand, the construction must be regulated. For the connector part of the line, it must be tightly taped with insulating tape.

Selection test method:

The most direct method is to see if the drip on the control panel will affect the operation of the equipment when the equipment is running.

Directly watching the circuit board to do moisture treatment effects, in general, do a moisture-proof circuit board looks much brighter than did not do moisture treatment, more important is the moisture-proof treatment, anti-oxidation, dust, The effect of anti-static electricity is also much better, and overall device reliability is also improved. The picture is for reference.

3, high and low temperature

High bottom temperature affects many devices: access control, power supply, optical transceivers, hard disk recorders, etc. Because video access control is a systematic project, any instability in one part may affect the normal operation of the system. At present, the market for video access control is Shenzhen in the south and Urumqi in Xinjiang in the north. Shenzhen is characterized by high temperatures. Xinjiang is characterized by a large temperature difference between day and night, low temperature can be as low as minus 30 degrees Celsius. This environment makes it necessary to fully consider the wide temperature adaptation range of the product when selecting a product. At present, some engineering traders' friends often appear in the actual application of the project when the equipment is good or bad, good morning, bad afternoon, usually due to temperature changes caused by the system has always been. The author believes that in projects such as video access control, we must select the full industrial grade (-40 ~ 85 degrees Celsius) products to meet the reliability requirements of the system.

Selection test method:

The high and low temperature test method requires a constant temperature oven and freezer to set up a simulated operating environment. When the equipment is powered on, it is put into a high temperature oven at 85°C and a freezer at -40°C, and then the operating status of the equipment is checked. , At the same time check whether the various functions of the device can be used normally (such as whether the controller's brush opens and opens the door is normal). If the equipment can maintain stable and normal work for at least 8 hours under high and low temperature conditions, it indicates that the product has good high and low temperature reliability.