VFD & Inverter Technology Blog
Insights on variable frequency drives, inverter applications, selection guides, and industry trends to help engineers and system integrators make better decisions.
Troubleshooting Three Phase Current Imbalance in VFDs
Introduction Dealing with a three phase current imbalance at the Variable Frequency Drive (VFD) output is a challenging issue that frontline…
What is VFD Compressor? Working Principle & Retrofit Guide
By OULU Electric Engineering Team Introduction In industrial plants, compressors are often the undisputed energy hogs, consuming up to 40% of…
VFD Pump Selection Guide
By OULU Electric Engineering Team Introduction Stop throttling your pumps. We see it in mechanical rooms every day: a high-efficiency pump…
What Causes VFD Overcurrent? Diagnosis & Fixes
Introduction An overcurrent fault is the most aggressive error a Variable Frequency Drive (VFD) can throw. Unlike an overload, which is…
What is VFD Overload? Causes, Wiring, and Solutions
Introduction In the world of industrial automation, a tripping drive isn’t just a nuisance; it’s downtime. We see it constantly: a…
Why VFD IGBT Failure? Long Cables & Voltage Spikes Fix
Direct Answer: VFD IGBT Failure and capacitor failure are frequently caused by Voltage Spikes generated from Long Motor Cables (>50m). The…
3 Real Causes of VFD Overvoltage Fault: Static, Aging & Grid
Today, we’re reviewing a fault that trips up even seasoned veterans: the VFD clearly has normal voltage, yet it repeatedly reports…
3 Reasons VFD Won’t Stop at 0Hz & Fixes for 12Hz Start
Today, we’re reviewing a highly perplexing field failure case. An engineer reported an odd phenomenon: when his VFD was shutting down,…
5 Reasons VFD Stops Randomly No Error Code & How to Fix It
Today, let’s revisit a particularly mind-boggling field failure case. Reviewing user comments, I noticed a highly representative phenomenon: After replacing the…
