WEG CFW501 HVAC Drive

Purpose-Built Variable Frequency Drives for Pumps, Fans, and Building Systems

The CFW501 is WEG's dedicated HVAC and pump drive platform. It combines proven CFW500 hardware with factory-tuned energy-saving algorithms, integrated PID control, and building automation protocols. Gross Automation packages CFW501 drives with bypass cabinets, harmonic mitigation, and commissioning support so facility teams can modernize legacy starters without disruption.

Plan an HVAC Drive Package Download Brochure Search CFW501 Parts

Power & Voltage Range

Single Phase:
0.5 to 3 HP (0.37 to 2.2 kW) at 200-240 V

Three Phase:
1 to 150 HP (0.75 to 110 kW) at 200-240 V and 380-480 V

High Voltage:
7.5 to 125 HP (5.5 to 90 kW) at 575/690 V for industrial plants

HVAC Control Suite

Dual PID loops for supply/return pressure management
Pump alternation, lead/lag, and anti-jam routines
Fire mode, smoke purge, and bypass interlocks
Sleep/wake energy optimization with adjustable thresholds
Native BACnet MS/TP, Modbus RTU, and optional BACnet/IP gateways

Electrical Enhancements

Harmonic Mitigation:
12-pulse, line reactors, and passive filters engineered per IEEE 519

Motor Protection:
Class 20/30 overload, dry run detection, and pump block monitoring

Enclosures:
IP20, IP55/NEMA 12, and outdoor-rated bypass cabinets with space heaters

Ideal Applications

Air handling units, cooling towers, and VAV boxes
Municipal and industrial pumping stations
Chilled/hot water distribution and hydronic loops
Hospital, university, and data center mechanical plants
Retrofits replacing across-the-line starters or aging VFDs

Features That Support Facilities Teams

Energy Optimization

Automatic sleep mode, proportional integral control, and load detection reduce consumption during off-peak windows without sacrificing comfort.

Fast Commissioning

Intuitive wizard, removable keypad with copy function, and Bluetooth/app connectivity streamline setup for service contractors.

Mechanical Protection

Pipe fill, anti-water hammer, and pump cleaning cycles extend asset life while preventing nuisance trips.

Facility Integrations

Native BACnet objects, Modbus registers, and analog I/O expanders make it simple to tie CFW501 drives into existing BMS platforms.

HVAC & Pumping Packages

UL508A Bypass Cabinets

Factory-engineered bypass, test, and manual override packages with short-circuit coordination, HOA selectors, and door-mounted HMIs.

Retrofit Kits

Custom backplates, conduit adapters, and wiring harnesses designed to replace legacy drives or starters inside existing enclosures.

Water & Wastewater Skids

Integrate CFW501 drives with PLC500 pump sequencing, flow meters, and telemetry for mission-critical pumping operations.

Building Analytics

Pair drives with CFW900 gateways or PLC500 controllers to capture run-time analytics, trend energy usage, and feed enterprise dashboards.

Seamless Building Automation Integration

Gross Automation engineers configure network topologies, alarm handling, and safety interlocks so your CFW501 drives communicate reliably with BACnet, Modbus, or PLC-based control rooms. We ensure every drive alarm and run status maps to your supervisory system.

Pre-engineered BACnet object lists and graphics templates for major BAS platforms
Integration of fire/smoke override circuits and safety chains with documented testing
Remote connectivity via cellular or Ethernet gateways for multi-site support
Drive trending dashboards aligned with energy reporting initiatives

Schedule Integration Review

Deliverables

Network Schematics

Detailed riser diagrams, addressing tables, and wire schedules for BMS and PLC teams.

Commissioning Plans

Test scripts covering PID tuning, bypass verification, and alarm notifications.

Lifecycle Support

Remote diagnostics, firmware maintenance, and annual performance reviews.

CFW501 Technical Resources

Quick Start Guide

Step-by-step startup checklist covering parameter macros and recommended wiring practices.

Download PDF

Building Automation Mapping

Request our BACnet/Modbus register map with pre-labeled points for trend logs, alarms, and control loops.

Request Mapping File

Bypass Cabinet Submittal

Receive dimensional drawings, short circuit ratings, and wiring diagrams for packaged bypass systems.

Request Submittal