Overcurrent in centrifugal pump motor
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What are the reasons for overcurrent in centrifugal pump motors? The outlet backpressure is 9.5 kilograms, the pump outlet pressure is 15 kilograms, and the valves in the outlet line are fully open – what else could be the cause?
There are some differences between the overcurrent during startup and that during operation. Generally, overcurrent during operation can be caused by problems with the motor itself, such as bearing wear, rotor rubbing against the casing, friction from the cooling fans, and coil aging. Pump-related issues include bearing wear or damage, friction at the shaft seals, and foreign objects stuck inside the impeller. Additionally, process-related factors such as cavitation, increased material viscosity, and higher flow rates can also lead to overcurrent. The specific approach needs to be determined by analyzing the situation on site
Did you pay attention to what the outlet pressure was under normal conditions before? If it is higher than before, it indicates that your pump is overloaded; a higher current level is understandable in such cases. If you do as before and turn on the backup pump to check if the pressure is the same, if the current is low, it indicates that there is some issue with the machinery of the pump that is currently in use.
The backup pump has the same pressure as this pump; there’s no issue. The pressure at the pump’s outlet remains unchanged, and the back pressure at the outlet is normal.
I’m sorry, I feel a bit short of words. . . . .
When the density of the material being processed is higher, more work is required, and as a result the current level increases slightly
I don’t understand this. Is the load too high? Or what’s the reason? Is the pressure too high? Wait
According to the characteristic curve, as the flow rate increases, the current rises. In other words, the magnitude of the current reflects the size of the load, and they are proportional to each other. Normally, the outlet valve of a centrifugal pump is rarely opened fully; with a certain back pressure in the pipeline, it is pointless to have the valve fully open. It is recommended to consider the following aspects: 1. Check the downstream usage, that is, adjust the back pressure ； 2. Close the outlet valve. 3. In situations like this, the probability of bearing or motor failures is relatively low; however, it is still possible to monitor the machine’s operating conditions (vibration, temperature, etc.)
What are the pump parameters? How to understand a back pressure of 9.5?
Did it appear suddenly? Bearing wear in the pump and poor alignment of the pump can also lead to an increase in shaft power; please check again ； A decrease in the back pressure of the pump will lead to an increase in flow rate, resulting in overcurrent ； It is best to turn on the system to check and verify the pump assembly parameters ； The motor also needs to have its faults eliminated first!