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Inverter air conditioner, 蹿 ,, Zhang Yunkun, example 1, therefore, the phenomenon is connected to the power supply, the light, the flashing, the light, are not bright, the outdoor unit does not work.
Analysis and maintenance Inverter air conditioners are different from ordinary air conditioners in that they change the frequency through the built-in inverter to control the DC inverter dual-rotor compressor. During operation, the data measured by the electronic temperature sensor of the inverter system is sent to the 1 module, and after internal analysis and processing, the command is issued to control the compressor to operate within the range of 15,150. If any part of the compressor module and sensor fails, the outdoor unit does not work.
After the inspection, the compressor and HC module resistance values ​​are in the normal range, and the indoor unit temperature sensor is judged to be 17-foot 5106. Remove the temperature sensor, the resistance value measured at room temperature 25 is infinite. Normally it should be 58k, indicating that it is damaged. After replacing the DTN7KS106E, troubleshoot.
Case 2, the phenomenon is self-diagnosis, the running indicator light is always on, but the printing indicator light is not bright, and the outdoor unit does not work.
Analysis and maintenance of the machine's self-diagnosis function is mainly through the three lights of the operation. According to the fault phenomenon, it is judged that the fault is on the signal line between the indoor and outdoor units. According to the user's introduction, the machine has just failed to work due to installation and use, and the juice is estimated to be incorrectly installed. Re-examination, signal lines between indoor and outdoor units, found that the indoor and outdoor machine number signal line and the number power line are inserted incorrectly. The signal is interrupted and the machine is automatically protected. Reconnect the indoor and outdoor connections and the machine will return to normal.
In the case of Example 3, after the phenomenon is energized, the panel power indicator light is on, but the indoor fan does not turn.
Analysis and maintenance Put the power of the indoor unit to the OFF position. After 5 seconds, the buzzer sounds and the panel lights are on. It is known from the self-test results, so it is pulled out on the indoor fan motor. Check, the DC resistance value of each color line of the fan motor, found that the resistance between the red and blue lines is infinite, the normal should be 6.18, indicating that the fan motor has burned out.
Remove the fan motor, repair the rear installed machine, place the power switch in, grab the position, in addition to the diagnostic content, then place the power switch at the critical position of 0 watt 10, observe the machine running indicator light does not respond, indicating that the diagnosis has been, except , test machine, the machine is running normally, troubleshooting.
Example 4, the phenomenon is powered on, the compressor does not turn, the outdoor unit does not, the operation, analysis and maintenance start-up self-diagnosis, and the running indicator lights are all flashing, thereby judging that the fault is in the variable frequency data processing circuit module.
Remove the module, and use the DC resistance of the measuring terminal to find that its + terminal resistance is infinite, indicating that the open circuit is damaged. Because the module cannot be purchased, the replacement of the block inverter board is contacted by four companies, and the fault is eliminated.
Example 5, the phenomenon is connected to the power supply, the indicator light is off, the outdoor unit is not working; the analysis and maintenance are not lighted due to the power supply indicator, the initial judgment is that the fault is in the power supply circuit, and the power supply relay of the power supply can be normally sucked. The power board 1 and the 3 pins are found, and the 3 pins are also found. The jack 31 and the filter magnetic ring are inspected along the bypass road, and it is found that the filter magnetic bad is broken. After replacing the filter magnetic ring, the fault is eliminated. The air supply is running, such as the electric motor, and the air conditioner compressor motor and the fan motor. Except for the partial use of the 4 motor, the most common one is the permanent split capacitor operation. Motor 5. This motor has two windings, the starting winding secondary winding and the running winding main winding. When the motor is running, the windings are connected in series with the AC capacitor, so that the starting winding current leads the winding current by 90 degrees, that is, the phase-separated induction current is generated, so that the motor starts and keeps running.
Capacitor faults are proportional to air conditioner electrical system failures. The example is as follows. During the inspection, the compressor is just started, and the indoor fan blows out the cold air. After half a minute or so, the hot air is blown out, and then the air conditioner is self-protected and stopped, and the overvoltage fault code is displayed. Analysis of the refrigeration system pressure, there are too many refrigerants, air in the system, poor heat dissipation of the outdoor heat exchanger and so on.
Unplug the external machine and find that the fan capacitor is short-circuited. Due to the short circuit of the capacitor, the fan does not rotate, so that the external heat exchanger does not dissipate heat, causing the system pressure to be too high. Replace the fan capacitor and troubleshoot.
cold. The test machine, the outdoor unit can be started, the indoor running light refers to normal, but the indoor fan does not supply air. After the inspection, the indoor fan capacitor opens, causing the fan to not operate. The fan capacitor is replaced and the cooling works normally.
The working current was measured by a clamp type of about 20 people, and the compressor was humming and could not be started. Analysis of the compressor does not start to make a beep, as a result of the low voltage of the coil short circuit card cylinder shaft capacitor failure. Inspection, compressor operating capacitor leakage is serious, replace the same type of capacitor, the compressor starts running, heating work is normal.
Single-phase cabinet machine illusion 7 than the stomach. Fault phenomenon The fuse is blown for 30 people during heating operation. Inspection and testing machine, clamp type measuring working current, starting compressor cold machine starting operation, current 12.5 people, there is hot air. However, it can be seen from the clamp type that the compressor is slow to start when it starts, and it takes about two seconds to start. When the set temperature is reached, the fuse is blown when the compressor heat engine is restarted after the room temperature drops. Unpacking the external machine, the compressor running capacitor has a slight leakage phenomenon, replace the same type of capacitor, and troubleshoot. Analysis of the compressor cold machine can start, the heat engine can not start, because the compressor heat machine starting torque is larger than the cold machine, due to capacitor leakage, the capacity decreases, reducing the compressor starting torque, so the cold start Slow, the heat engine can not start, the fuse is blown.
Note Capacitor Open Circuit Short Circuit Leakage Fault Measurement Before using universal measurement 1, the capacitor should be short-circuited with wires or screwdrivers to prevent electric shock.
1 Open circuit breaker pointer does not swing to the right.
The short-circuit breakdown pointer does not retract after swinging to the right.
Air conditioner capacitance running motor running capacitor common fault and maintenance