After running for 4-6 hours, a 45KW deep well pump shuts down suddenly without any apparent reason. What could be the cause?
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This post was last edited by hesonchang214 on 2018-10-15 09:39. The pump and motor in this well were just replaced; it would trip as soon as it was started, but it could run after the phase wires were adjusted. After 4–6 hours of operation, the circuit breaker in the drawer cabinet tripped; the motor protector did not emit any alarm signals, and the operating current remained stable (around 70). Later, after replacing it with another identical drawer, it tripped as soon as it was turned on; I don’t know what the reason is I hope everyone can help find out the reason. Thank you!
If checks show that there are no issues with the motor and cables, and that the connection terminals of the drawer plug (which are male connectors) are in good condition, then there must be a problem with one of the power supply and load terminals that are in contact with it; this is why phase loss and overcurrent occur, leading to tripping of the circuit when the motor starts. Currently, 25% of cases are due to poor contact caused by frequent insertion and removal of drawers as well as quality issues.
What mechanism does your deep well motor protection use? Through current protection