Why does the motor burn out after the pump runs in reverse?
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In our factory, a faulty check valve caused an emergency shutdown, which led to the multi-stage centrifugal pump rotating in reverse and burning down immediately
Excessive heating of the motor and overvoltage on the capacitor can cause the capacitor or the motor to burn out.
When the motor reverses direction, it acts like a generator, and the excessive current can burn out the capacitor!
One of our 22kw motors was damaged due to incorrect wiring by the electrician – the live wire and ground wire in the three phases were swapped. This mistake went unnoticed during testing; it wasn’t until the pump had been running for over 30 hours that the issue was discovered. Fortunately, the motor wasn’t damaged. Since it is a circulation pump, there are no indicators for things like flow rate, so it was only after the analysis results came in that the problem was identified
Reversing polarity can sometimes cause excessive voltage, which can damage the motor and capacitors. But these days, the motors and capacitors of most pumps allow reversal, right?
Reply to 4# chinazwr: Out of curiosity, if one of the live wires and the ground wire are connected incorrectly, does that count as a phase loss condition?
The pump is driven by an electric motor; so how can the reverse rotation of the pump cause damage to the motor? Perplexed, I thought it was simply the reverse direction of the pump blades that was causing the reduced efficiency
It’s possible that the motor was started during the reversal process, resulting in an excessive current surge that caused the motor to burn out.
Agree with what was said above; I support it
Reply 1# arespx: The motor burning out is likely not related to reverse rotation; check whether wrong wiring has caused a phase loss.
Reversing the pump generally will not burn out the motor, unless the motor is started while the pump is running in reverse, resulting in a high starting load on the motor and thus causing it to burn out