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  • DC link voltage and VFD question | Eng-Tips
    You say the "motors drew more amps" You generally cannot use standard meters to measure the output of a VFD because the output is a complex waveform made up of many kilohertz pulses All meter readings on the motor side are suspect A VFD is not 100% efficient so running a motor across the line will typically be more efficient than adding a VFD into the mix Measuring the current into the VFD
  • Is there a standard symbol set? | Eng-Tips
    In fact, this trends with Kilohertz, and other multipliers, rather than KiloHertz I'm confused as to why the third sentence insists upon a capitalized Celsius, when referring to the unit, rather than the astronomer, then Edit-to-add: I suppose because "degree Celsius" is not a unit "Degree" is a unit "Celsius" is a 'modifier' per NIST
  • Transformer and coil audible noise suppression techniques
    ScottyUK: the low frequency humming ( 2 times the mains frequency ) is one type of audible noise caused by magnetostriction of the core, but in the case of wrongly designed or manufactured coil or transformer the audible noise can appear even if you are switching on few kiloHertz frequency





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