I would like to ask, what should be done if the current consumption of a centrifugal pump is low?
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My centrifugal pump has a power rating of 15 kilowatts; the voltage is 380 volts. The current drawn during startup is 21 amps, which is relatively low. Based on this current value, the actual power generated is only 13,821 watts, which is less than 14 kilowatts. How can I get it to operate at its rated power? It’s about 1000 watts lower – is it likely to burn out the motor?
I’m not very familiar with electricity; it seems like there should be no problem with the pump. Check the electrical connections. As for concerns about overheating, just monitor the temperature of the motor more closely
This post was last edited by WSRYLONG on 2018-7-13 at 10:11. High load is what easily causes motor burnout. The lower it is, the less likely it is to burn out the motor. As long as the flow rate and head of the water pump meet the requirements, the lower the motor load, the better. I don’t understand why it needs to be increased to the rated power The load on your water pump motor is normal; it’s not in a light-load condition either.
If this power is slightly low, as long as it remains within the normal range, there’s no risk of damaging the motor; it doesn’t matter whether it reaches the rated current or not.
The load is low, but the pump is operating normally and will not damage the motor; it’s just that the pump does not achieve its rated flow rate. As long as the process requirements are met, this operating condition is still good for the pump.
My pump originally had a head of 32 meters and a flow rate of 100 tons; I used it for spraying in a flower garden. Since I wasn’t familiar with pumps, I bought one with too high a head, which resulted in excessive current consumption. After realizing this, I contacted the manufacturer and had the pump head replaced. Now the head is 20 meters and the flow rate is 160 tons; the spraying works properly, though the current consumption is slightly lower.
The pump works fine when in use; it’s the switch that causes problems – pressing it frequently leads to a shutdown, and it takes several attempts to get it to start.
Pumps and their motors need to have a margin of safety; for yours, you need to use a safety factor of 1.25 times the shaft power. Working backwards, an axis power of less than 12 kW is considered normal
The specific gravity of the medium has decreased； Cavitation or air erosion occurs ； The outlet valves are not fully open, so the load cannot be increased ；
So what power level is considered normal for my pump when it’s in use?
Isn’t it written above that a power level of 12 kW or less is considered normal? Based on the discharge pressure, if there is no flow meter, the pump’s flow rate can be determined using P=ρgH. Take a look at the motor power at this time