Torque control can be done with any of AutomationDirect's PID-capable drives. This would be a closed loop system USING torque as the process variable. There should be both a torque reference and torque feedback signal. The user would establish a torque setpoint and configure the drive to maintain that setpoint. Many customers have used torque sensors, load cells, and current transducers to establish an analog input to the drive. Ideally, a vector drive would work better than a volts/hertz drive.

A vector drive allows TIGHTER speed regulation and better control in the lower speed range. Torque limiting can be done with AutomationDirect's Hitachi SJ300 series drive. INSTEAD of using an external torque sensor, torque limiting uses the drive's internal current sensor. The operator would set the torque limit, and when that level is exceeded, the drive would act LIKE a governor on a GENERATOR. The speed would be restricted until the appropriate level is again maintained. Mechanical devices, in addition to drives, are also employed for torque limiting, such as clutches, shear pins, gearboxes, etc.

Torque control can be done with any of AutomationDirect's PID-capable drives. This would be a closed loop system using torque as the process variable. There should be both a torque reference and torque feedback signal. The user would establish a torque setpoint and configure the drive to maintain that setpoint. Many customers have used torque sensors, load cells, and current transducers to establish an analog input to the drive. Ideally, a vector drive would work better than a volts/hertz drive.

A vector drive allows tighter speed regulation and better control in the lower speed range. Torque limiting can be done with AutomationDirect's Hitachi SJ300 series drive. Instead of using an external torque sensor, torque limiting uses the drive's internal current sensor. The operator would set the torque limit, and when that level is exceeded, the drive would act like a governor on a generator. The speed would be restricted until the appropriate level is again maintained. Mechanical devices, in addition to drives, are also employed for torque limiting, such as clutches, shear pins, gearboxes, etc.