Allen-Bradley 22A-B2P3N104 and 22A-B4P5N104 are PowerFlex 4 variable-frequency drives for controlling three-phase induction motors from a 200…240 V three-phase supply. Each drive is installed after branch protection and before the motor, where it adjusts output frequency and voltage to control motor speed, direction, acceleration and stopping.

Within 22A-B2P3N104 and 22A-B4P5N104, the three-phase input feeds a rectifier and DC bus, then an IGBT inverter produces 0…230 V three-phase motor power. Start and reference commands can arrive from the integral keypad and potentiometer, the dedicated and programmable digital terminals, the isolated analog input or RS-485 DSI; the Form C relay supplies a hardwired status output.

Four preset-frequency commands in 22A-B2P3N104 and 22A-B4P5N104 can be selected by the programmable digital inputs, allowing external contacts to call defined motor speeds without supplying a changing analog reference. The drive moves toward the chosen frequency through the active acceleration or deceleration ramp and continues to apply current limiting and overload protection; the motor load determines which of the two common-control power stages is required.