Danfoss dV/dt Filters
Danfoss dV/dt filter technology enable non-inverter duty motors – including older, two-speed motors – to comport with its VFD technology, providing a cost-effective means to reduce the risk of motor failure – by approximately 80%.
“dV/dt” filters provide a slower voltage rise rate on a motor’s terminal phase-to-phase voltage. The higher the level of inductance, the higher the voltage peaks, which can cause flashover, a condition that results in premature breakdown of the winding insulation of a connected motor.
dV/dt filters reduce the peak voltage, enabling them to prolong the life of a motor. They accomplish this by cutting off frequencies above the switching frequency.
Similarly, Danfoss “sine” filters eliminate 100% of the risk of applying VFD technology to a non-inverter-duty motor – at a higher component cost. Ask NES which filter application make sense for your, particular set of circumstances.
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