How I Built a VSD-Based Control Panel for My Workshop Compressor

Excerpt:
This post walks through the process of upgrading a 3-phase compressor using a VSD for better efficiency and safety.

Why Upgrade?

The old star-delta starter caused voltage drops and maintenance headaches. VSD solved it.

Components Used

• Delta VFD 7.5kW
• Isolator, motor protection breaker
• Custom aluminum enclosure
• Panel indicators + reset switch

Wiring & Safety

• Used shielded cable between VSD and motor
• Added thermal overload relay to protect the windings
• Installed emergency stop outside the panel

Control Logic

• Start/stop via front panel switch
• Auto restart on power return
• VSD ramp-up time: 3 sec

Results

• Quieter operation
• 15% less power draw
• Smoother pressure cycles

Let me know if you’d like help upgrading your own machinery.