This can happen due to incorrect wiring on electric motors, accidental configuration on VFDs, or improper reinstallation. In some cases, pumps are intentionally run in reverse to reverse flow direction. Whether this is a problem—or a useful feature—depends entirely on the type of pump.
In essence, the pump, which should operate clockwise, operates counterclockwise (or vice versa). In layman’s terms, it runs backward, which is a critical concern for any centrifugal pump rotation issue. What Will Happen If Pump Rotation Direction Is Reversed?
In some cases, pumps are intentionally run in reverse to reverse flow direction. Whether this is a problem—or a useful feature—depends entirely on the type of pump. Centrifugal pumps are designed to rotate in one specific direction. If the motor is wired incorrectly and the impeller spins backwards: It won’t generate useful flow or head.
The chance for a pump to run backward occurs most commonly with applications utilizing three-phase power when installing a new pump and electric motor, replacing a motor, changing a starter, or adding a VFD. Before coupling the motor to the pump, run a "bump test" to ensure the shaft is turning the right way.
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