Cooling tower motor is the core power equipment of cooling tower. It is a normal phenomenon that rolling and air conflict occur during operation. But the staff sometimes found that the cooling tower electric timing of some abnormal sound, that these abnormal sound is the cause of it? The following Xiaobian will take us to analyze.
1. The cooling tower motor presents a "buzzing" abnormal sound in operation. It may be that the cooling tower motor itself has a winding short circuit, or it may be caused by the line problem. Can be viewed around these two aspects, first use the appearance of the insulation resistance of the cooling tower motor, clean up the possibility of cooling tower motor winding leakage or insulation performance decline.
Solution: disassemble the junction box of the cooling tower motor, remove the connecting piece, and measure the resistance value of each phase winding about 100MΩ. The resistance between each phase winding and the ground (to the shell) is about 60M, which is fundamentally normal. The winding coil of the cooling tower motor is not a problem. The wire (refers to the connection of the motor of this section of wire) short circuit, in the other end of the wire with a shaking meter detection, the wire is through, clarify that there is no broken wire phenomenon.
After the connection of the cooling tower motor is restored, press the start button to measure the communication voltage. The measured results show that the voltage between phase A and B is 380V, the voltage between phase A and C is only about 120V, and the voltage between phase B and C is only about 120V, which illustrates that there is A problem with the voltage of phase C. Through inspection, it was found that most of the copper core wires of C wire had been broken. After the replacement of the same standard wire, the motor runs in balance and the fault is removed.
2, in the case of electric cooling tower bearing damage, bearing room wear, end cover stop deformation or wear and casing stop ellipse, the stator and rotor of the motor will conflict with each other and abnormal sound.
Solution: the conflict between the rotor and the stator is caused by the winding of the rotor shaft or the severe bearing wear and the local wear of the rotor device bearing. Fundamentally speaking, if the bearing wear is severe, the clearance increases, the motor bearing needs to be replaced; If the rotor shaft wear sag after surfacing with the lathe after processing device use; If the rotor shaft is tortuous, it needs to correct the rotor shaft, file away the stator or the outstanding part of the rotor core in order to make the cooling tower motor work normally.
3. When the cooling tower motor foundation is not firm or the fixing is not tight, the cooling tower electric timing shakes so that part of the screws or parts become loose and make abnormal sound.
Solution: adopt the blocking power supply, the use of electromagnetic noise with the strength of the magnetic field, the size of the load current and the speed of concave and convex characteristics, the cooling tower motor of no-load operation after listening for a period of time suddenly blocked power supply. With the power supply cut off part of the noise will disappear immediately, this is electromagnetic noise. The noise caused by continuous operation of inertia after power failure is mechanical noise. From this we can identify the cause of noise, that is, can deal with the problem. If the screw is loose, tighten the screw.
4. The wind blade of the cooling tower motor is damaged or the screw that fastens the wind blade is loose, which causes the wind blade and the wind blade cover to collide with each other when the cooling tower motor is running. The sound it makes follows the weight of the collision sound, sometimes big and sometimes small.
Solution: usually in this case, we need to correct the cooling tower motor blades, tighten the motor screws, and the cooling tower motor can operate normally.
5, the long-term use of the cooling tower motor makes the lack of lubricating oil in the bearing to wear the single bearing or damage the steel ball in the bearing, so that the cooling tower motor bearing makes abnormal hissing or grunting sound.
Solution: in this case, we should first clean the motor bearing, and then add new lubricating oil, and the capacity should not exceed 70% of the volume. If the bearing wear is severe, it needs to replace the new bearing to ensure the normal operation of the cooling tower motor.
Guangdong Trlon Energy-saving Air Conditioning Equipment Co., Ltd.
Company Address： 1916A, Block A, David Donglong Business Building, Longhua, Longhua District, Shenzhen