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VFD Panel Design Guide: Heat Load First, Enclosure Second
A VFD panel is sized from its heat load, not from its footprint. Add up every watt the panel dissipates,…
VFD Specification Template for Tenders and Project Manuals
A VFD specification template is a three-part document written under MasterFormat section 26 29 23 that states the requirements every…
How to Select a VFD for a Crane (Three Drives, Not One)
Select a VFD for a crane by starting with the duty class, not the motor nameplate. A crane is not…
When to Use a VFD on a Pump (and When Not To)
Use a VFD on a pump when the system’s head is mostly friction and the flow actually varies. Do not…
How to Size a VFD Without a Motor Nameplate: Five Methods
How to size a VFD without a motor nameplate comes down to two things: identify the frame size and pole…
VFD Replacement Cross Reference: Six Checks Before You Swap
A VFD replacement cross-reference matches a model number to a model number. It cannot tell you whether the replacement will…
Regenerative Drive vs Braking Resistor: Four Paths, Not Two
A regenerative drive vs braking resistor decision looks like a choice between two devices. Framed as a braking resistor vs regenerative drive question, it…
dV/dt Filter vs Sine Wave Filter: When Each Earns Its Cost
A dV/dt filter slows the voltage rise at the motor terminals but leaves the drive output as a PWM pulse…
Line Reactor vs Harmonic Filter: Which One Do You Need?
Line reactor vs harmonic filter comes down to what you are trying to fix. A line reactor is a series inductor…