Why VFDs Get Blamed First 

When a line goes down, the VFD is often the first thing blamed. In reality, the drive is usually reacting to a mechanical or process issue rather than causing it. 

Electrical Symptoms of Mechanical Problems 

• High current at low speed 

• Frequent overload trips 

• Inability to reach commanded speed 

• Rising torque demand over time 

How to Prove It’s Mechanical 

• Compare no-load vs loaded current 

• Trend torque or current values 

• Inspect bearings, couplings, and driven equipment 

• Disconnect the load when possible 

Common Mechanical Culprits 

• Failed or failing bearings 

• Product buildup or jams 

• Misalignment 

• Gearbox issues 

Final Thought 

If electrical data points consistently toward rising load, believe it. The drive is reporting what it sees.