@NickAlexeev That's true. It is interesting, that an AC servo motor's speed is dependent not only on the frequency (obvious), but by the available voltage also. The faster that motor spins, the more volts it requires. So a 240V drive won't be able to spin a 460V motor to full speed. Which explains why voltage ratings on those motors are sometimes generalized (240V, 400-ish volts) or left off entirely.