Which outcome occurs when variable-frequency drive slows down a rotary vane pump moving hydraulic fluid in cold conditions?

💡 Explanation

When a VFD slows a rotary vane pump with cold hydraulic fluid, the increased fluid viscosity increases pressure drops within the pump, potentially causing cavitation because the fluid's vapor pressure becomes closer to the inlet pressure. Therefore, increased cavitation risk occurs, as opposed to bypass opening, stator overheating, or check valve chatter, which depend on other parameters.

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