During operation, inverters generate harmonics that can cause interference in nearby systems or instruments. Interference faults caused by such disturbances include significant measurement errors in instruments, failure of some instruments to function properly, and even erroneous system operations. High-power harmonics produced by inverters follow similar pathways as general electromagnetic interference: through circuit coupling, electromagnetic radiation, and inductive coupling, leading to interference voltages or currents. It has been shown that strong electromagnetic fields on-site and fluctuations in the power supply are primary sources of interference affecting instruments connected to inverters. However, a quick method to determine if the interference is indeed caused by the inverter involves stopping the inverter when interference occurs; if the instruments and systems return to normal immediately, it can be confirmed that the interference was due to the inverter. This method isn't always correct and requires analysis based on specific circumstances.

Technical personnel believe that at sites experiencing interference faults, the following measures can be taken to overcome interference from inverters to instruments:
1. Add filter circuits in the instrument's circuitry to block or bypass interference signals.
2. When the instrument features digital filtering, set a certain time constant to suppress interference.
3. Use shielded cables for signal transmission and ground the shielding layer at a single point.
4. Parallel a 4.7 microfarad / 100V capacitor across the transmitter's output signal terminals or connect capacitors between the output signal line and ground.
5. Ensure that the negative terminal of the signal line is grounded.
6. Employ signal isolators.
Sunye Electric Co., Ltd. (Changsha Sunye Electric Co., Ltd. was established in 2010; Shenzhen Sunye Electric Co., Ltd. was established in 2002) is a national high-tech enterprise integrating R&D, manufacturing, and sales of inverters, industry-specific all-in-one machines, servo drives, and new energy products.
Sunye Electric owns independent intellectual property rights. Its products have passed inspections and certifications by national authoritative institutions and have obtained multiple software copyrights and IP certificates. It invests heavily every year in researching new technologies and developing new products, with many patents and software copyrights granted. The company possesses core platform technologies such as construction hoist drivers, high-performance vector inverters, servos, and permanent magnet synchronous motor controls. Its low- and medium-voltage inverters and servo drives are widely used in industries such as lifting equipment, stone processing, HVAC, machine tools, metal products, wire and cable, plastics, printing and packaging, textile and chemical fibers, building materials, metallurgy, coal mining, municipal services, and automotive applications. Guided by the philosophy of "innovation, technology, and strength," and driven by the corporate spirit of "unity, progress, pragmatism, and innovation," the company adheres to the business principle of "honesty and excellence, mutual benefit and coexistence." With a quality policy of "implementing total quality management and continuous improvement to pursue zero defects," Sunye Electric is committed to providing premium products to customers across various industries.
Address: Sunye Electric Industrial Park, No. 669 Xinsheng Road, High-Tech Zone, Changsha City
Tel/Fax: 0731-89932666 0731-89932688
Business Phone: 400-0755-731
Technical Support: 400-0755-731