How poor grounding can cause EMC problems in frequency converters

Poor grounding is a common root cause of various EMC problems in frequency converters. High impedance or broken grounding paths can lead to: Filtering component failure (e.g., the Y capacitor in an EMI filter requires low impedance grounding to conduct common-mode noise to the ground; poor grounding prevents effective bypassing of noise, resulting in excessive conducted emissions); Reduced shielding effectiveness (poor grounding of the chassis or cable shielding layer fails to provide a discharge path for interference currents, causing internal noise to radiate out and external interference to intrude, deteriorating both radiated emissions and immunity); Increased common-mode noise (uneven grounding impedance can cause common-mode voltages between different points in the system, driving strong common-mode radiation from cables and potentially causing equipment malfunctions); Surge and electrostatic discharge failure (poor grounding prevents the rapid discharge of transient large currents, potentially damaging internal circuits); Ground loop interference (when two points in the system have different grounding impedances, a loop is formed, picking up power frequency or noise magnetic fields and interfering with signals). Poor grounding is usually caused by poor soldering, loose screws, oxidation of contact surfaces, or the use of thin wires. The solution is to design and implement a low-impedance, reliable grounding system according to specifications and perform regular maintenance and inspection. Eintech's high-quality grounding connectors help prevent such problems.