Volts Per Hertz mode:
Voltage and frequency are increased proportionately as the speed reference (speed pot) is increased. Volts per hertz mode is adequate for controlling the speed of pumps, fans, and other non-critical speed regulation applications.

 

Sensorless Vector mode: 
Sensorless vector mode is adequate for controlling the speed of conveyors, augers, extruders, and applications that require speed regulation of less than 1%. This mode is good at regulating torque above 10-15% of base speed.

 

Vector mode: 
Vector mode requires an encoder or resolver coupled to the motor. This mode provides the best speed regulation of all the modes. Used to regulate speed of unwinders, rewinders, pinch rolls, and other applications requiring speed regulation of 0.1% or less.