Installation and maintenance of building intercom system

Because the building intercom is a device with high frequency of use, many residential building intercom systems installed 5-6 years ago have suffered varying degrees of damage due to natural weathering, man-made damage and normal wear. Over the warranty period, many of the original construction and construction units have been unable to contact, causing great trouble to the majority of owners and property management companies! Replacement of a complete set of new equipment will inevitably cause various levels of waste to property and residents, and maintenance of existing equipment is a laborious and unprofitable task. Many professional companies are reluctant to engage in this task. I have been engaged in many years of experience in the installation and maintenance of building intercom systems, summarizing the following points for your reference:

First, the installation points

1. The laying and selection of wire rods: The new building must be pre-embedded. The old building must also be equipped with PVC flame-retardant tubes. Each floor is equipped with a floor junction box for easy maintenance. Incoming line terminal concealed junction box. As far as possible, wire rods should be selected as national standard lines. For the 8-storey construction video lines, 75-3 should be used, and high-rise and high-level use 75-5 to ensure the clarity of the images. Signal bus must be more than 0.3mm tensile, flame retardant, waterproof wire. Years of experience, our company has been using Jiangsu Unicom cable, although the price is slightly higher, but the quality is good, and its service life is more than 10 years. Value for money.

2, the power supply UPS try to use the transformer type, but to leave a margin, the main advantage is: easy maintenance, lightning protection is better than the switching power supply. Purely personal preference.

3, the host points the use of mechanical and electrical control lock selection: In the premise of using Dachang Dachang, we must ensure that the local brand agents, must have adequate repair supplies provided, must have professional repair technology.

4, the use of door closers: The principle is not the use of non-brand, a corridor unit does not work with the electronic control door, one of the key components is the door closer, the quality of the door closer directly affect the function of the building intercom system Play and service life.

Second, maintenance points

Building intercom in the maintenance, repair, if you can get the instructions and wiring diagrams, then it is best to read the instructions and wiring diagrams as well, do not blindly chaos check, specifically the following common sense points:

1 look

The first is to understand the specification and wiring diagram, which is the debugging, maintenance must master; second is to see whether the wrong, wrong line, if the line is wrong I think no matter whether the product can not be normal operation, generally There will be workers accidentally picking the wrong ones or the owners renovating the houses to change the line and picking the wrong ones. Again, it is to see if there are any rigid damages to the components, which are often caused during construction. Check whether the components are burned and burned (usually the scorch of the current limiting resistors). The fuse is blown); The last is to see whether the various function indicators are on. If the power indicator is off, then there is no power. If the communication indicator is off, it is a communication obstacle, etc., but usually the power supply first tries to check the others. There are some manufacturers have product failure tips, are generally on the digital host (because there is no direct display), such as my company's product host has 8 kinds of error messages, as well as communication lights.

2 listen

Mainly to listen to whether the relay jumps or component bombing (Oh, horror, but do not worry, fried but not to pay attention to safety comrades); in the unlock signal switching (such as video and audio power, etc.) to achieve such functions as pay attention, such as If the jump test is a circuit problem or a bad relay contact, correct or replace it. For example, if you do not unlock the fault, we can first hear whether the relay unlocks when it is unlocked. If you do not hear the relay jump, you can initially determine that the host is not unlocked, and then find the reason why the host does not unlock; if you hear the unlock relay jump or To control the solenoid lock pick-up sound, then use the meter to unlock the line if there is electricity output, there is a check lock line or lock, there is no host or unlock, usually due to poor contact with the relay contacts. There is some manufacturer's system failure prompt tone, such as my company's host has S line V line short-circuit prompt tone, the extension has encoded room number tone, line busy tone, etc.; some manufacturers even have voice prompts.

3 smell

If you smell burnt, then surely the accessories are broken. In general, you need to replace them. Note that you must first find out why you can remove them (usually if the wrong polarity is caused by the polarity of the power supply, and the signal line is connected to the power cable). It will be useless to continue to burn out the originals and replace the accessories N times.

4 replacement

If you suspect that there is something wrong with the fitting (equipment), use a good fitting (equipment) to replace it. If you troubleshoot the fitting, then it is not a problem. For example, if a decoder or extension is connected, the whole unit cannot be called. If the entire unit is changed, it can be determined that the replaced decoder or extension is bad. Note that if the problem can not be solved after two replacements, it can be judged that the fault is not caused by this accessory, because any manufacturer is generally not likely to leave the factory with two devices, there is a problem, and can not continue to change, we must first find out the reasons for exclusion After the change, it is impossible to find a suggestion to contact the manufacturer

5 Exclusion

Is to cut off some of the accessories or system equipment, if the problem is solved or ruled out, if the broken part or device has a problem to be replaced, it may solve the problem. For example, if a unit failure is unreasonable, if it is determined that it is not a host problem (that is, if a good host still cannot solve the problem), then there may be a certain decoder in the unit, which is also called a platform (platform decoding fault isolation system ) Or extension (bus decoding system extension decoding) is a problem, there may be a problem with the unit main line; at this time we use exclusion of part of the exclusion. Can be ruled out by one-half, that is, half and half of the break, until the problem is detected, and even the last to 1 power supply 1 host 1 extension or 1 power supply 1 host 1 platform 1 extension (something may also be added signal amplifier) Connect short-term, if there is no problem with the short-term, it may be insufficient power supply or interference, or even the manufacturer system can not afford so much

6 judgment

Generally it is to judge the fault scope and position, such as a unit is not unlocked. First of all, it is the entire unit is not unlocked or a certain number of households or 1 household is not unlocked, if it is the entire unit is not unlocked, it may be the host does not unlock (if it is power control Lock that is the power is not unlocked) or electronically controlled locks, broken lines and other issues, can try a new lock. It is also possible to directly output the voltage and current at the host's unlatching line terminal when disconnecting the sewing thread. If it is a part of the extension that does not unlock, it has nothing to do with the host or the electric lock, and it can find the cause directly on the extension or the decoder. The same is true when not ringing

7 Measurement with a multimeter

Usually refers to using a multimeter to measure voltage, current, resistance (on/off short circuit), capacity (capacitance capacity), and so on. This is the first requirement to be familiar with the use of multimeters, and novices should be familiar with more practice. For example, use a multimeter to measure the on-off of a wire; first, make sure the other wire is on, then short-circuit one end of the measured wire with another, and then use the table on the other end of the two wires. Whether the thread breakage of the two threads is open (if the general sheet resistance is 0 and the sound is accompanied by a sound), it is off. The use of metered voltage is also used more; for example, to see if there is power, if there is an output, and so on. The use of multimeter can look at me: multimeter makes skills use Daquan.

8 Make a record

During construction, commissioning and maintenance, due to too many systems or no mention of famous books, etc., we often get the wrong line and we can't figure out how the line was taken, or if we don't know how the line is disconnected, After that, it will be less than the original, not to mention repairing the machine is getting more and more bad; so in the construction, maintenance is to make a detailed record, such as how the line is going, what color is connected to the terminal Wait, so that you will not be confused when you are young.

Finally, it is necessary to understand clearly what functions are used in the debugging and maintenance system, how to use it, the correct wiring diagram, the trend of the engineering wiring, fault phenomena, and the time and condition of the fault (it can never be used to indicate that the system may not be debugged properly. There is a problem with irresponsibility or manufacturer's products, which may be too much trouble to solve the problem and cannot be repaired;it could not be used before, indicating that system accessories can be repaired or replaced to restore the system.If these points cannot be clarified, It is difficult to maintain and maintain.