VFD and Motor Compatibility Worksheet
Compare a VFD continuous output-current rating with a motor nameplate current, then track key manufacturer checks for the application.
Rated current check
Use the rating for the exact drive model and configured duty after applicable derating.
Use the motor nameplate value for the connection and voltage being used.
Manufacturer review
Drive and motor current
About this worksheet
Compare the drive’s continuous output-current rating with one motor’s nameplate current. The checklist records whether key manufacturer review topics have been considered.
Use ratings for the exact equipment configuration and application. This worksheet does not choose a drive, motor, cable, or protection device.
Method and assumptions
Current margin = drive continuous output-current rating − motor nameplate current. A nonnegative margin means only that the entered motor current does not exceed the entered drive current rating.
The comparison does not account for application-specific overload, starting or torque demands, motor operating speed, ambient conditions, altitude, cable length, or equipment instructions.
Interpret the result
Treat the current comparison as one screening item. Complete the review against the selected drive and motor documentation, the driven load, and project requirements before selecting, configuring, or commissioning equipment.
FAQs
Which drive-current value should I enter?
Use the continuous output-current rating for the exact drive model and configured duty after applying the manufacturer’s required derating.
Does a current match prove the drive and motor are compatible?
No. Voltage, phase, torque, speed range, overload duty, cooling, cable length, output filters, and installation conditions also matter. Follow the exact drive and motor documentation.
Can I use this for multiple motors on one drive?
No. This worksheet compares one motor with one drive. Multi-motor systems need a separate review of aggregate current, individual overload protection, drive requirements, and the full application.
Does checking every box approve the installation?
No. The checkboxes track review items only. They do not verify values, product compatibility, code compliance, or commissioning safety.
Sources
- Use the exact VFD and motor manufacturer manuals for continuous output-current ratings, derating, cable limits, motor requirements, and application settings.
- Schneider Electric, Altivar Process ATV930/950 Installation Manual — an example of model-specific motor cable and output-filter requirements; its limits apply only to the documented drive family.
- ABB, ACS880-11 Hardware Manual — an example of model-specific temperature and altitude derating information.