User Manual of EM730/EM730E Series Inverter Solution to inductive interference To suppress the inductive interference on the output side, all output cables can be laid in the grounded metal tubes, in addition to the aforesaid installation of the noise filter. When the distance between the output cable and signal line is greater than 30 cm, the impact of inductive interference will decrease significantly, as shown in Fig. 3-8.
MCCB Metal tube Inverter IM 30cm above Signal lines Control device Fig.3-8 Solution to Inductive Interference Solution to RF interference The input cable, output cable and inverter itself generates RF interference, which can be reduced by installing noise filters on the input and output sides and shielding the inverter body with an iron box, as shown in Fig. 3-9. MCCB Iron box Metal tube Noise filter Noise filter IM Fig.3-9 Solution to RF Interference Wiring distance between inverter and motor The longer the wiring distance between the inverter and motor, the higher the carrier frequency and the higher harmonic leakage current in the cable.
This will adversely affect the inverter and nearby devices. Refer to Table 3-2 to adjust the carrier frequency and reduce the high-frequency leakage current. 36 Inverter