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How to prevent motor and water pump from burning out? Do you know the correct way?
Aug 13, 2018

The main reasons for the burnout of the cooling tower circulating water pump motor are as follows.

The start of the load can cause the pump motor to be damaged: the actual use of the lift is less than the pump nameplate lift, and the submersible pump has no working time for the water.

The lift of the centrifugal pump is used to overcome the height and resistance. When the high lift pump is working at the high lift point, its flow is the flow at the design point. If it is working at low lift, it is equivalent to the outlet resistance of the pump is reduced. The flow rate of the centrifugal pump will increase, and the pump motor will be overloaded. If it exceeds a certain level, the pump motor will be burnt. For example, a feed pump has a head of 50 meters and a flow rate of 50 cubic meters per hour. When it feeds water to a height of 50 meters, its flow rate is 50 cubic meters per hour. When it feeds water to a height of 40 meters, Its height and resistance reduce its flow rate to 80-90 cubic meters / hour or more, when the pump motor will heat or burn.

First of all, first find out whether the pump motor burns the bearing (mechanical fault) or burned the coil (electrical fault).

If it is a fault of the burning coil, it is mainly caused by overcurrent. Sometimes the voltage is too high or too low, which will cause the coil to be short-circuited. Therefore, check whether the voltage during operation is too much difference from the rated voltage.

Over current short circuit, there may be several reasons:

1. The equipment is overloaded, so that the pump motor runs at rated current or over rated current for a long time. It is important to note that the starting current of the pump motor is 3-5 times of the rated current, so it should be avoided to start the equipment with load or full load (mainly depends on the matching margin of the rated current and normal running current of the pump motor). )

2. The pump motor works in a damp working environment. Before the pump motor starts, the ground insulation and phase insulation of the coil should be checked. The insulation requirements for different voltage levels are different. You can check it according to the relevant national standards. During the operation of the pump motor, attention should be paid to the waterproof and moisture-proof of the pump motor.

3. The mechanical failure of the pump causes the pump motor to be overloaded, and the current is too large to burn the coil.

4. The heat dissipation of the pump motor is a problem. Generally, the pump motor coils are air-cooled and the submersible pump is a water-cooled casing. Large-scale water pump motors are mostly cooled by air-to-air heat exchangers and air-to-water heat exchangers. If the cooling water (air) is broken and the coil cannot be dissipated, the coil may be burnt.