VFD Specifying & Selection
Choosing the wrong drive costs more than the drive itself. ISA engineers help you specify the right VFD for your application, load profile, and environment.
Request a SpecificationHow the Specifying Process Works
Three steps from application details to a drive specification you can act on.
Application Intake
Tell us about your motor, load type, operating conditions, and control requirements. The more detail you share, the more precisely we can spec the right drive for your application.
Drive Sizing & Selection
We run the calculations and evaluate options across our manufacturer network, selecting a drive matched to your torque curve, duty cycle, site conditions, and any integration requirements.
Specification & Quote
You receive a clear specification document with our recommended drive, full model details, and a firm price. No oversizing, no unnecessary features, no guesswork.
What Goes Into Proper VFD Selection
Drive selection is an engineering decision, not a catalog lookup. A correctly specified VFD accounts for motor characteristics, load behavior, environmental constraints, and control architecture. ISA evaluates all of it — across all major manufacturers — to recommend the drive that will perform reliably in your specific application.
Nameplate HP or kW, full-load amps, speed range, torque requirements, and duty cycle all factor directly into drive sizing and overload capacity selection.
Pumps, fans, conveyors, compressors, hoists, and extruders each carry distinct load profiles that affect drive selection, braking requirements, and parameter configuration.
Ambient temperature, installation altitude, humidity, and required enclosure rating — NEMA 1, 12, or 4X — all have direct impact on which drive models are appropriate.
Analog and digital I/O counts, PLC integration, fieldbus communication (Modbus, Profibus, Ethernet/IP), keypad requirements, and multi-drive coordination are all evaluated upfront.
Input voltage, phase configuration, line frequency, available fault current, and harmonic distortion limits must align with the selected drive's input specifications and any site requirements.
We work across Fuji, Siemens, ABB, Eaton, Yaskawa, Mitsubishi, and Schneider Electric — matching the right manufacturer to your budget, lead time, and existing site standards.
Request a VFD Specification
Share your application details below and our team will follow up to discuss the right drive for your needs.