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1. Device Type: Fire Pump 2. Fault Type: Auto Fire Pump frequent start the pump, while the alarm level may cause a fire and damage to the pump 3. The degree of fault levels: general failure device after introduction <br> <br> Troubleshooting
1. Failure information is obtained:
Integrated control station attendant Notification: Class 1 fire pump start issuing early warning 2. failure pre-judging and pre-prepared content <br> <br> prejudge There are four reasons:
1. someone presses the button to start the fire pump control box 2. Electric components fault 3. Fault 4. fire pump buttons control loop fault preparation content: spare parts, instruments, tools, walkie-talkies, room key <br> <br> Symptom confirmation And preliminary diagnosis
Because the fire pump automatically starts the pump, the initial diagnosis is:
1. Press the fire button artificial fire pump button 2. The control circuit fault damaged glass <br> <br> fault actual search process and confirmation
1. After arriving at the scene, first set the fire pump control switch to local control, and at the same time, power off the main circuit power supply of the fire pump, and check whether the fire pump is damaged or not. Check whether the components of the fire pump electric control box are working normally, whether there is any abnormality. Happening.
2. Check the status of the fire pump button one by one. Check the public area of ​​the station first, because this area is a dense area for passengers, and the possibility of passenger misoperation is the greatest. Secondly, check the station area, which is a densely populated area for passengers. The passenger has malfunctioned and finally checked the internal work area.
3. If all the fire pump buttons are normal, there may be a button control circuit open circuit and short circuit or a decrease in insulation resistance (the fire pump button control circuit has two types, one is series control, the other is parallel control, when connected in series) The circuit breaker or the parallel control loop short circuit both cause the above fault). Processing method: Segmentation inspection is eliminated step by step, and finally the fault location is found for processing.
4. If the insulation of the fire pump button control circuit is reduced due to environmental humidity, it can be detected in stages to find out the fault point. After inspection and measurement, it is found that there are many insulation reduction phenomena in the fire pump button control loop of the station, and the insulation resistance is generally 12K?-20K?
5, check the measurement control loop relay (KA4) coil voltage is 127V, causing the relay to shake, resulting in the control loop is connected to cause the fire pump to automatically start the pump. Under normal circumstances, the control relay (KA4) coil voltage should be zero. Only when the fire pump button is turned on and the AC220V voltage is applied to the relay coil, the relay action turns on the control circuit to start the fire pump. Because the fire pump control circuit is insulated, the power supply is The virtual impedance formed by the system insulation reduction forms a series circuit with KA4. When the virtual impedance is reduced to a certain value, the circuit divides the voltage to the voltage of KA4 to cause it to act, thereby causing the fire pump to operate.
It is confirmed by analysis that the control relay acts due to the insulation of the fire pump control circuit.
Troubleshooting method:
It is difficult to re-route (due to the buried construction), the problem can be solved by replacing different types of KA4 relays. The original KA4 relay uses a high-impedance coil relay (model HH54P), and the coil measuring resistance is 14K? Low-impedance coil relay (model CA2DN22) with a coil measuring resistance of 0.6K?
Cause Analysis:
1. The direct cause of this fault The fire pump button automatic control loop is affected by environmental factors, and the insulation resistance value of the fire pump button control system is reduced.
2. Analysis of the factors causing the direct cause The fire pump is an essential fire-fighting facility for the subway. It is different from the general independent equipment. The automatic control system of the fire pump button is distributed in all corners of the station, and the distribution is long and long, which is affected by the operating environment. Large, at the same time there are certain construction quality problems, various insulation treatments are not standardized when laying pipelines, and then the ground line equipment is greatly affected by the weather environment, the seasonal temperature difference is large, usually the temperature difference is above 70C°, and the electrical line aging degree is high. The rainy and humid conditions are severely corrosive to the pipelines buried in the structure. The above reasons are the factors that cause the failure.
Case processing optimization analysis
Ways and key steps for correct handling (judgment) of such faults (correct processing steps)
step:
(1) First stop the fire pump, and then switch the electric control cabinet automatic switch to the local manual in the machine room, and open the main circuit of the fire pump to open and power off, and do the relevant registration procedures.
(2) Check whether the fire pump is normal, check whether the components of the fire pump control cabinet are working properly, and turn the electric control cabinet into an automatic state. Check whether the voltage at both ends of the KA4 coil of the automatic loop control relay is normal. If the coil voltage is 220V, the fire is indicated. The pump button circuit is connected or the control circuit is short-circuited. If the voltage is abnormal (below the power supply voltage), there is a problem of insulation reduction in the fire pump button control circuit.
(3) Check the status of the fire pump button one by one, whether there is any action or glass damage. If the button action is restored, the glass is damaged and replaced.
(4) If all the fire pump buttons are normal, there may be a button control circuit open circuit or a decrease in insulation resistance. Replace the local line.
(5) Replace the relevant components.
Troubleshooting has been analyzed
It is determined that after the control line insulation is reduced, the cable needs to be replaced. The higher the control loop insulation, the better. However, since the original line is buried and the old cable cannot be moved, it is difficult to solve the problem by replacing the control line.
Optimization analysis of fault handling
This equipment failure is caused by the reduction of the insulation resistance of the automatic control circuit of the fire pump button. First, whether the insulation resistance of the control circuit is lower than the insulation standard of the relevant cable specified by the state, and the minimum allowable operating temperature of the 1.5 square plastic insulated control cable. The insulation resistance is 0.011M?.Km. By measuring the insulation resistance of this control circuit, it is not lower than the national standard. Therefore, it is not necessary to replace the system control cable to solve the problem. It is in the normal use range, so replace the low-impedance coil relay to make the coil. Reduce the voltage division of the circuit, so that the relay does not operate when the insulation of the control circuit is reduced, to achieve troubleshooting.
Atlantic Pump Industry Tips:
When dealing with failures, do not be completely convinced by the indicators. Experience is also very important. When the camera and the four-picture fault occur, the indicator test is very timely and accurate. When testing video cables, one is a single-line test and the other is an inter-line test. If the indicator is normal, then you should think about interference and deal with interference problems. Experience is very important, the subway electromagnetic and dust interference. Video signals in such an environment have more interference failures.
Example 1: Unfixed interference. When the train enters and exits the station, an arc is released. At this time, look at the monitor image, one is that the color changes, and the other is that the image is twisted.
Example 2: Fixed interference. When the camera or video cable encounters low-frequency signal interference, the monitor has interference patterns. Some are horizontal stripes rolling slowly, and some vertical stripes are slowly rolling.
Learn the lesson:
This fault caused the fault to be repeated because the fault point was not found in time. Influencing operational indicators, the following lessons should be learned:
1. Technical indicators such as four screens and monitors. The test was normal, and the test was not believed. The four screens and monitors without faults were replaced.
2. If you do not find the point of failure, you should keep a watch. And actively organize the power to find out the reasons.
Precaution:
1. First of all, the fire pump control principle should be clear, and the basic principles of the electric control cabinet components should be mastered: several control methods of the fire pump should be clear, manual control mode, automatic control mode, BAS control mode, and emergency start mode. The control principle must be mastered. The role of the fire pump PLC input and output loop should be well known.
2. Gradually accumulate experience (1) On-site treatment of equipment failures, improve judgment and hands-on ability.
(2) Participate in construction and commissioning work, which is convenient for combining theory with practice.
(3) Cooperate with the manufacturer or the master to deal with the fault. It is necessary to ask more, read more, listen more, do more, and make necessary records. It is convenient for you to solve your own problems later.
3. Deal with the fault to be decisive, do not let others interfere with the idea.
Don't be nervous when you encounter a fault. Don't think that the fault becomes a C-type accident and deduct money, causing psychological pressure. Dealing with faults is generally about 3 people, and encountering a difficult problem is a thought of one person. After the main processor has finished listening, he should analyze it more and think that it is necessary to stick to it and do it immediately, avoiding the time being too long.
The fire pump automatically starts pumping faults frequently
Fault overview