The current will exceed the limit when the outlet of the pipeline pump is fully open
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Both the inlet and outlet of the pipeline are DN200; the opening degree of the outlet valve is around 3/1 with a current of approximately 95, and it exceeds this value if the opening degree is increased any further. Is there anyone who understands this and can explain what’s going on?
There’s nothing wrong with the circuits. I have 3 pumps here that are all like this
During superflow, the pump flow rate did not exceed the specified limit
The head of the pump is much higher than the actual head; when the valve is opened wide, overflow occurs, which in turn leads to excessive current flow. Cutting part of the impeller can solve this problem.
The pump’s head has been increased to a level that is much higher than the actual resistance in the pipes; as a result, the flow rate exceeds the pump’s rated value, and the shaft power is greater than the motor’s capacity. It is necessary to buy a new pump or have the impeller re-machined, or else reduce the size of the outlet valve
As the flow rate increases, the resistance increases as well. High current
Is the pressure at the pump inlet too high, causing the outlet pressure to exceed the rated head pressure? If the pressure isn’t high, it means the demand at the outlet side is too great, exceeding the rated flow rate, which ultimately leads to motor overload