Screw Compressor VFD “Strikes”? Top 3 Common Issues to Watch
Release time:
2025-08-12
The Variable Frequency Drive (VFD) is the “brain” of your screw compressor, but it’s sensitive to power fluctuations, overheating, and harsh environments. Here are the top reasons it might suddenly stop working:
1. Power Issues
Undervoltage: If input voltage drops below the VFD’s operating range, it will alarm and shut down immediately. This often happens during peak electricity usage or due to aging power lines.
Overcurrent: Sudden load changes, motor stalls, or incorrect settings can trigger overcurrent protection.
Ground Fault: Leakage to ground will cause the VFD to stop. Check motor insulation and cable grounding right away.
2. Overheating Risks
Poor Cooling: Broken fans or blocked vents trap heat inside. Regularly clean dust—especially in dusty environments like textile or woodworking shops—and ensure fans run properly.
High Ambient Temperature: Hot summer conditions can push VFD components beyond safe temps. Improve ventilation or use cooling methods like water mist to lower temperatures.
Overload: Running above capacity for long periods generates excess heat. Lower exhaust pressure, adjust torque compensation, or upgrade to a higher-capacity unit.
3. Environmental Damage
Corrosive Gases: Chemical plants often expose VFDs to corrosive gases that damage circuits. Use sealed electrical cabinets or corrosion-resistant drives.
Conductive Dust: Metal dust in mines or cement plants can cause shorts. Clean internal components regularly with compressed air.
Prevention Beats Repair
VFDs usually give warning signs—unusual noises, slight temperature rises, or occasional parameter drifts—before failure. Don’t wait for a full shutdown.
For tough issues like motherboard failure or burned components, it’s best to call in professionals. Companies like Hunan Gonghui Automation offer same-day diagnostics and repairs to save you time and hassle.
With basic troubleshooting skills and regular professional maintenance, your screw compressor’s VFD can stay reliable and keep your production line powered up—no more unexpected “strikes.”
Service Hotline: 86 13862059949
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