Example 2
Reference input through potentiometer R11 (f_s) and fixed frequency (f₁, f₂, f₃) through terminal 3 and 4 with internal control voltage
Enable (START/STOP) and rotating field selection through terminal 1

: Emergency-Stop circuit

S1: Off

S2: On

Q11: Mains contactor

R1: Line reactor

K1: RFI filter

Q1: Line protection

PES: Cable screen PE connection

M1: Motor, 3-phase 400 V

FWD: Clockwise rotating field enable, reference frequency f_S

FF1: Fixed frequency f₁

FF2: Fixed frequency f₂

FF1+FF2: Fixed frequency f₃