Variable Frequency Drive (VFD) Replacement for Dual Fans – Naples, FL

PROJECT DESCRIPTION: VARIABLE FREQUENCY DRIVE (VFD) REPLACEMENT – NAPLES, FL

Coharbor Electric was recently called to a commercial facility in Naples, FL, to address issues with two large ventilation fans that were not performing as expected. After troubleshooting, we determined that both variable frequency drives (VFDs) had reached the end of their service life. The fans were operating inconsistently, and the failing drives were creating efficiency problems for the client’s day-to-day operations.

Variable frequency drives are critical for systems like these, as they provide smooth motor control, extend equipment lifespan, and help lower energy usage. When a VFD begins to fail, it can cause the fans to surge, stop unexpectedly, or run inefficiently, all of which disrupt normal facility function. The decision was made to replace both units with new, properly sized VFDs designed to handle the existing motor loads.

WHAT WE DID:

• Safely disconnected and removed (2) failed VFD units from the existing control setup
• Supplied and installed (2) new VFDs compatible with the fan motors and system voltage
• Programmed the new drives with optimized parameters for smooth acceleration, deceleration, and precise speed regulation
• Verified all wiring connections, grounding, and conduit terminations to ensure compliance with NEC standards
• Performed full operational testing to confirm proper fan performance under different speed conditions
• Provided documentation and walked the facility staff through basic operation and maintenance steps

THE RESULT:

With the new VFDs installed, the two fans are now running reliably and quietly. The client immediately noticed improved airflow throughout the facility, as well as smoother startup and shutdown cycles. In addition to improved performance, the drives allow the fans to run at reduced speeds when full power is not needed, creating significant energy savings. By minimizing mechanical stress, the new equipment also extends the life of the motors and reduces long-term maintenance costs.

FREQUENTLY ASKED QUESTIONS

How long did the replacement take?
The full replacement process, including removal, installation, programming, and testing, was completed in under 5 hours.

Why replace VFDs instead of repairing them?
Older VFDs are often not cost-effective to repair. Replacing them ensures better reliability, manufacturer warranty coverage, and access to updated technology.

Can VFDs help reduce energy costs?
Yes. VFDs allow fans to run only as fast as necessary, which significantly reduces electricity use compared to running at full speed constantly.

Do you service industrial fan systems?
Absolutely. Coharbor Electric provides complete electrical services for commercial and industrial facilities, including diagnostics, repairs, and installations of fan motors, control systems, and power equipment.