Add an anti-interference capacitor to the output of the amplifier

(2) Frequency converter anti-interference wiring 2
    The wiring is as shown in the figure. The photoelectric relay and the frequency converter are in the same system and share the power supply. When the frequency converter is running
, the high-order harmonics generated by the frequency converter will cause the relay to malfunction. To do this, install a 0. OltLF capacitor C between the COM terminal of the amplifier output and the chassis . to eliminate malfunctions.