What are the reasons why horizontal centrifugal pumps keep tripping?
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What are the reasons why horizontal centrifugal pumps keep tripping? It trips after about 10 minutes of operation. The line inspection shows no issues, and the pump is also fine. . . Could it also be those reasons that were not taken into account? The master said it might be a problem with the head pressure. The pump’s head is 12m, but in practice it’s around 1.5m. Will this cause a trip? Who can provide a detailed analysis? . . Thank you. . .
The pump’s head is 12 meters, while the actual operating head is 1.5 meters. According to the head-flow curve, when the head is low and the flow rate is high, the motor current becomes excessive, resulting in a trip. Suggestions: ① Use the outlet valve to control the flow rate and reduce the current to the allowable range ； ②Replace the impeller with a smaller one, or cut the impeller. Personal opinion, for reference only.
” The pump’s head is 12 meters, while the actual operating head is 1.5 meters. According to the head-flow curve, when the head is low and the flow rate is high, the motor current becomes excessive, resulting in a trip. Suggestions: ① Use the outlet valve to control the flow rate and reduce the current to the allowable range ； ②Replace the impeller with a smaller one, or cut the impeller. “ I’ve learned it! Thank you!
According to your description: 1. The outlet pressure is low; check whether the flow rate is higher than the rated value. If the flow rate is too high, it indicates overload and heating, which leads to protection by the thermal relay； It is necessary to reduce the outlet valve opening in order to keep the outlet pressure close to the rated head. If the water flow rate is close to the rated value, it indicates that cavitation and air entrapment are occurring; prolonged operation leads to overload and overheating, which triggers the thermal relay protection ； Fill the pump and release air. 3. Check that the outlet diameter is larger than the inlet diameter, or that the inlet is blocked; this can cause the pump to operate improperly and trigger the thermal relay protection ； Troubleshooting 4. Faults in the rotating parts, such as damaged elastic elements, misalignment, excessive vibration, bearing failures, loose fixing components, a faulty motor fan or the motor being covered, excessively high ambient temperatures, interruptions in coolant supply, lack of lubricating oil, etc. Check and resolve these faults
What was said upstairs is quite clear. However, the output of a pump needs to be controlled; when adjusting the valve opening, it is necessary to monitor the changes in current to ensure that it does not exceed the rated current. Additionally, the outlet pressure should be considered – it is equal to the head multiplied by the density, plus the inlet pressure. Frequently check the motor and its temperature to determine the optimal opening degree of the outlet valve
Check whether the outlet circuit breaker matches; this is likely the main cause of the tripping.