It’s a mistake to assume the VFD is does all the work. Not every manufacturer does auto-tuning the same, but there are common adjustments they all make. Courtesy: Yaskawa What gets changed through auto-tuning Because of this unfamiliarity between the motor and the VFD that auto-tuning becomes the bridge by which good motor information can be passed to the drive.įigure 3: Some of the measured values are used to populate a single-phase induction motor circuit model. It is more the norm that brand A motor will probably be used with brand B VFD. Conversely, the VFD and motor are only sometimes manufactured by a common company. A simple motor code is all the amplifier needs to know everything about the connected motor. The reason for the difference is servo motors and their amplifiers are always bought together from one manufacturer. The VFD auto-tuning asks the load is detached from the motor when the auto-tune is performed. The tuning will help adjust gains for positioning and speed loops. With servo motors and amplifiers (close cousins of the VFD and induction motor), the auto-tuning function will probably have more to do with tuning the servo pair to their loads. As the name auto-tune implies, any operation that calculates and adjusts things automatically at the user’s behest can be called an auto-tune function.
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