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A: When the fan is turned on, the motor does not turn. We should think of whether the fan motor is burned out. There are many ways to judge whether the motor is good or bad. You can remove the fan motor and directly introduce three-phase AC to judge the quality of the motor. You can also measure the three-phase winding of the motor with the resistance of the multimeter. The normal resistance of the three-phase winding should be 8.3 Euro. Left and right; it can also be judged by visual observation.
Failure principle analysis: After judging the fan motor is normal, we will analyze the cause of the fan motor not turning. The main component that controls the fan motor is the fan AC contactor, and the device that protects the fan motor is the thermal relay. Analysis of the cause of the fault: The fan startup switch is faulty. Normally, the contacts cannot be switched; or the water in the switch is short-circuited. There are many reasons that cause the fan thermal relay to operate or burn out. The main power supply lacks phase, the grid voltage is seriously unbalanced, the fan contactor contacts are burned out, the main power switch has one or two sets of contacts, or the terminals are in poor contact. It may cause the fan thermal relay to operate. In addition, the fan motor itself may short circuit or enter the water. It may also cause the thermal relay to perform protective action or burn.
Judgment and processing methods: There are two ways to judge this kind of failure, one is the convenient and practical test method of the electroscope; the other is a simple and accurate multimeter measurement method. The specific method is omitted. Troubleshooting measures: After determining the faulty device, first remove the bad device, and then buy the same type of device (the model is generally marked on the device), if you can not buy the same model, even if you buy substitutes, but also to ensure that substitutes The function is greater than or equal to the original device. Do not just look at the same appearance to buy, be sure to look at the specifications and models. It is recommended that you mail or purchase from the company's after-sales service department of the production equipment or the designated accessories sales department, and usually prepare some common wearing parts.
2. When the fan motor is stopped, sometimes the speed is very slow. What is going on?
Answer: During the operation of the fan motor, sometimes the fan suddenly stops, and after a while, it restarts. However, after only a few minutes after the start, it stops and stops for a while and starts again. Sometimes when the fan is started, the fan motor speed is very slow, and after a while, the fan will not stop. If such failures are not discovered and processed in time, over time, it is easy to burn out the components of the motor and fan control system. Failure principle analysis: If we understand the characteristics of the thermal relay, we can understand the cause of this failure. Thermal relays are relays that use the thermal effects of current to protect the motor from long-term overloading. On the thermal relay, there is a manual reset and automatic reset button. In the incubator, we set the thermal relay to automatic reset mode. When the load carried by the contactor is working under overload conditions for a long time, the thermal relay can be effective. Disconnect the contactor wire pack during the time to protect the fan motor. But when the self-locking mechanism in the thermal relay cools down, the control switch in the thermal relay sends the power to the fan contactor to drive the motor. At this time, the fan system will return to normal, but after a few minutes, the thermal relay will reheat. The contactor power is turned off and the fan motor is stopped again.
Fault analysis and processing: From the above analysis, we know that the cause of the fault is in the fan thermal relay. What causes the fan thermal relay protection action? We know that the lack of load or phase (the voltage of a certain phase is very low) is the main cause of thermal relay action.
Judgment method using direct detection method, turn off the machine, according to the principle from the back to the front, for each device to determine the measurement, from the fan motor has been found to the user power switch blade fuse, will likely cause the lack of phase or poor contact control device replacement Or tighten.
The following points are several situations that often appear in actual maintenance: (1) AC contactor contact oxidation, poor contact, or contact burnout; (2) poor contact between thermal relay and contactor connection part; (3) user brake Poor contact of the knife fuse or the loose wiring of the incoming terminal; (4) Poor connection of the connecting wires of each device, especially the connection of the power switch and the motor itself; (5) The adjustment of the thermal relay protection current is too low, especially to pay attention to summer heat The setting current of the relay is adjusted to a proper height, usually 4.5 to 5 amps. (6) The use of the thermal relay is too long and the internal control lock mechanism is aging.
Incubator failure knowledge quiz
1. After starting up, start the fan switch. Why doesn't the fan motor turn?
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