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Drives
MRO — MOTION CONTROL
Variable Frequency Drives & Motor Controls
We help facility managers, HVAC contractors, and MRO procurement teams source variable frequency drives (VFDs), soft starters, and motor control components for HVAC and industrial applications. Availability may vary by supplier, stock status, and product type.
What This Category Includes
Motor drives and controls regulate motor speed, torque, and starting characteristics. This category covers VFDs, soft starters, and motor control accessories used in commercial HVAC, industrial, and facility maintenance applications.
ⓘ Drive selection requires matching HP, voltage, and application type to the motor and load. Submit your motor specifications and application details for sourcing support.
Variable Frequency Drives (VFDs)
Electronic drives that control motor speed by varying AC frequency. Used on HVAC fans, pumps, compressors, and industrial equipment for energy savings and process control.
Soft Starters
Reduce motor inrush current and mechanical stress during startup. Used where full variable-speed control is not required but smooth starting is needed.
Motor Starters & Contactors
Electromechanical devices for motor starting, stopping, and overload protection in fixed-speed applications.
Drive Accessories
Input/output filters, line reactors, dynamic braking resistors, and keypad/remote operator panels for VFD installations.
VFD Selection Guide
| Parameter | What to Match | Notes |
|---|---|---|
| Horsepower (HP) | Motor nameplate HP | Size VFD at or above motor HP |
| Input Voltage | Supply voltage (208V, 230V, 460V, 575V) | Single-phase or three-phase input |
| Output Voltage | Motor nameplate voltage | Must match motor rating |
| Application Type | Variable torque (fans/pumps) or constant torque (compressors) | Variable torque drives are sized differently |
| Enclosure Rating | NEMA 1 (indoor), NEMA 4/4X (washdown/outdoor) | Match to installation environment |
| Control Interface | Analog (0-10V, 4-20mA), digital I/O, BACnet, Modbus | Match to BAS/controls integration requirements |
Frequently Asked Questions
Q: What is a variable frequency drive (VFD) used for in HVAC?
VFDs control motor speed by varying the frequency of the electrical supply. In HVAC, they are used on air handler fans, cooling tower fans, pump motors, and compressors to match output to demand, reducing energy consumption and mechanical wear.
Q: How do I select the correct VFD for an HVAC motor?
Match the VFD to the motor's horsepower (HP), voltage, and full-load amperage (FLA). Also consider the application type (variable torque for fans/pumps vs. constant torque for compressors), input voltage, and enclosure rating for the installation environment.
Q: What is the difference between a VFD and a soft starter?
A VFD controls motor speed continuously by varying frequency. A soft starter only controls the ramp-up and ramp-down of motor speed during starting and stopping — it does not provide variable speed during operation. VFDs offer more control but at higher cost.
Q: Can I source replacement VFDs for commercial HVAC equipment?
We help source VFDs for commercial HVAC applications. Availability may vary by brand, HP rating, and voltage. Submit your motor HP, voltage, and application details for sourcing support.
Need Help Sourcing a VFD or Motor Control?
Submit your motor HP, voltage, application type, and brand preference for sourcing support.
Contact Procurement Support