What is the relationship between a pump and electric current?
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What is the relationship between current and pump operation when it starts? How can one determine whether the pump is rotating in forward or reverse direction by checking the current? Can someone explain?
First of all, saying that will lead to problems: the centrifugal pump must have its motor disconnected in order to test its forward and reverse rotation; otherwise, issues are likely to arise； If a shielded pump/magnetic pump is operated in reverse, its operating current and pressure are slightly lower than those when it operates in forward direction.
The rotation direction is determined in this way: before testing the pump, the coupling (if any) is disconnected first to test the motor, and the rotation direction of the motor is observed to determine whether it is correct. For pumps with direct motor connection, fill the pump with liquid, start up the system, and use jog operation to determine the rotation direction.
The greater the work done by a pump, the higher the current it consumes. As for determining whether the motor is rotating forward or backward, it’s quite easy.
Check the pressure and flow rate; the current is not significant.
First, disconnect the coupling and conduct a single-unit test run.
I’m a newcomer, but I’d like to share my thoughts. The magnitude of the current reflects the amount of work being done. I’ve never experienced a pump operating in reverse under normal conditions; it must be that the check valve has failed. Well, I think the current level should be slightly lower than normal. But if the pump really does operate in reverse, the abnormal noise and vibrations would definitely be striking, and the pressure differences at the inlet and outlet would also be very noticeable. However, I guess no one would dare to go and check if the pump is indeed running in reverse This question can also be asked to experts in the field of electricity, to see what their power supply readings show. I hope some expert will appear to provide a perfect explanation for this issue.
Firstly, when the pump runs in reverse, the pressure gauge at the outlet will show a value lower than normal. Secondly, as a safety measure, one can disconnect the coupling and try running the motor to check its rotation direction. For integrated pumps such as shielded pumps, it is necessary to have an electrician use specialized tools to determine whether they rotate in the correct direction or not. In the chemical industry, experienced senior employees generally have the knowledge to make such judgments easily. Hope this can help you