Can Motors like Model 5IK90GU-S/S3FT/5GU100RT be Driven by a Variable Frequency Drive (VFD)?

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Motors such as model 5IK90GU-S/S3FT/5GU100RT are AC induction motors. The standard method of operation is to connect them directly to a three-phase AC power supply. The product information includes a wiring diagram.

If there are constraints or a necessity to use a VFD:

• For short-term or light-load use, VFD control can function normally.
• However, for long-term or heavy-load operation, it is strongly recommended to prioritize inverter-duty motors (which feature enhanced insulation and are better adapted for PWM signals).

This is because a VFD outputs a PWM (Pulse Width Modulation) signal containing high-frequency harmonics, which can place additional stress on the motor's insulation. The insulation of standard induction motors is not reinforced for this purpose, and prolonged use under VFD control may potentially shorten their lifespan.

If a VFD must be used, ensure the VFD's output voltage and current settings match the motor's rated values, and optimize the acceleration/deceleration times to prevent overloads.

Updated on: 30/10/2025