41391-454-01-D1DX A-B Control Unit
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Reduced Mechanical Stress and Maintenance: Every time an induction motor starts across-theline, the electrical and mechanical stress is significant – inrush current heats the windings and the sudden torque jolt can strain the drivetrain. VFDs virtually eliminate high starting stress. As noted, instead of 600% current, the motor might see 150% or less during startup with a VFD . Heat buildup in the motor is therefore much lower, extending insulation life. Belts, gears, chains, couplings, and bearings all experience gentler acceleration, which means less wear. Many plants that adopt VFDs report longer intervals between motor rewinds, bearing replacements, and other maintenance. For pumps and compressors, soft start/stop reduces pressure surges that can damage pipes or cause leaks. In a water pumping scenario, removing those pressure spikes (water hammer) can extend the life of pipes and valves by 20% or more, as the system isn’t constantly shocked by sudden changes. Less mechanical shock also means fewer nuisance trips of overload relays or shear-pin breakages on equipment. Overall, equipment lifetime is extended and unplanned downtime is reduced.
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