VFDs and Soft Starters
Variable Frequency Drives and soft starters are the workhorses of modern plant electrical systems, but they need careful setup and troubleshooting.
How a VFD Works
A VFD controls motor speed by varying the frequency of the power supplied to the motor — the practical effect is energy-efficient flow and pressure control.
VFD Setup Parameters You Should Know
A handful of VFD parameters define most of how the drive will behave in service — every operator should recognize their names.
Soft Starters vs VFDs
Soft starters reduce inrush current during motor start but do not vary motor speed once running — simpler and cheaper when speed control isn't needed.
Common VFD Fault Codes
Most VFD faults trace to a small group of root causes — environmental, electrical, or mechanical — that operators can often clear without an electrician.
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