Will the pump burn out if its outlet remains closed all the time?
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Keeping the outlet of the variable-frequency pump closed will damage the pump
Yes, the temperature will rise as kinetic energy is converted into internal energy.
Is it the inverter that has burned out, or are the internal components of the pump damaged due to overheating?
If it’s a plastic pump, it’s usually broken. If it is metal, the situation needs to be analyzed on a case-by-case basis
The temperature continues to rise, and in severe cases it can damage the pump
Under pressure, the motor current reaches its maximum value, and the temperature inside the pump also gradually increases.
It will happen in the end, it just takes longer than at line frequency for overheating to occur.
Centrifugal pumps will never experience excessive current. If the outlet is kept closed for a long time, all the work done by the pump is converted into internal energy of the material, causing its temperature to rise; this may later lead to problems with the pump. However, the idea that closing the outlet results in excessive current is purely the notion of laypeople
{:2_39:} I see, I really am an amateur. .
I’m sorry; my tone was too harsh. The step in starting a centrifugal pump is to open the outlet first, as this ensures that when the flow rate is at its lowest, the starting current is also minimal. This reduces the risk of damaging the motor or causing the pump to stop operating. If possible, it’s advisable to monitor the changes in current when starting the centrifugal pump