text: <s>[INST] How to gain full torque from motor at low speed I have an inverter 1305-3HP which I scaled 0-10V = 0-50HZ for a 4 poles motor. It has been observed that the torque of motor at 1-3HZ is not sufficient to turn the load smoothly. Kindly help me which parameters should I adjust to compensate it and also that how I can program that drive for “Sensorless Vector control”. [/INST] Unfortunately, the 1305 is a Volts-per-Hertz drive, so it cannot be configured as Sensorless Vector. :smileywink: This is the why it isn't easy to get torque and stability to these low frequencies. Only way you may try to play with DC boost (par. 9) to add some DC voltage to the running drive at low frequencies.Take a look to the User Manual, pages 5-18 / 5-19. Hope this helps... - fuzzy logic \\n </s>