AC Drive with Variable Torque. Particularly made for fan and pump applications requiring between medium and high horsepower. Automatic voltage regulation and an adjustable V/F curve are features of the F series. Additionally, it provides the capacity to connect and operate four motors in sequence. One variable-speed motor and three constant-speed motors can make up a set of motors.

Output frequency can range from 0.1 to 120 Hz; the V/f curve can be adjusted; there is a 16-step speed control and a 15-step preset speed process control; there is an integrated PID feedback control; there is a time/fix amount circulation control; and there is an integrated MODBUS communication with a baud rate of up to 38400 bps.
— Helping module for communications (DN-02, LN-01, PD-01)

Applications include large-scale water supply systems, wastewater treatment systems, large-scale water cooling systems, and public water supply systems.