Centrifugal pumps have high starting current
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The circulating water pump is started using a soft-start method; when starting, the current is 300+ amps with the outlet valve closed. The soft-start process cannot proceed properly, yet the pump shaft can still rotate normally. Could experts tell me how to determine what the problem is?
What are the pump parameters? Did the current change after the outlet valve was opened a bit?
What is the motor power? What is the rated current?
Please provide the pump’s nameplate information
There’s a problem with the motor; some components are missing or the wires are connected incorrectly
Is there a missing phase or is there a problem with the circuit?
This post was last edited by foam_ZPTK on 2019-3-17 22:12. Please provide the pump nameplate; it might be a motor issue. But there is significant room for energy savings in circulating water pumps
If a motor loses a phase, it will burn out very quickly.
Thank you to all the experts. It was later found that the clearance during pump assembly was smaller, but this wasn’t noticeably felt when turning the pump.