Frequency converter environment - Solutions - Huaqiang Electronic Network

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor, AVX 22

Electronic scale crystal oscillator, 3.2*2.5mm 3225, 16M (16.000MHZ), 12PF, 10PPM, 20PPM, 30PPM

High frequency probe, high frequency line can be customized, other specifications available

SMD aluminum electrolytic capacitor

Physical Environment

1) Operating Temperature: The inverter contains high-power electronic components that are sensitive to temperature changes. The standard operating temperature range is typically between 0°C and 55°C. However, for safe and stable operation, it's recommended to maintain the temperature below 40°C. The inverter should be installed at the top of the control cabinet, following the manufacturer’s guidelines strictly. Avoid placing heat-generating components near the bottom of the inverter.

2) Ambient Temperature: If the ambient temperature is too high or fluctuates significantly, condensation may form inside the inverter, reducing insulation performance and potentially causing short circuits. In such cases, desiccants or heaters should be added to the enclosure to manage humidity levels.

3) Corrosive Gases: High concentrations of corrosive gases can damage component leads, printed circuit boards, and plastic parts, accelerating aging and reducing insulation properties. To prevent this, the control cabinet should be sealed and ventilated properly to minimize exposure to harmful substances.

4) Vibration and Shock: Mechanical vibrations or shocks can cause poor electrical connections. To mitigate this, reinforce the mechanical structure of the control cabinet, keep it away from vibration sources, and use anti-vibration rubber pads for components like switches and electromagnetic devices. Regular maintenance and inspections are essential after prolonged operation.

Electrical Environment

1) Electromagnetic Interference (EMI): The inverter generates significant electromagnetic interference due to rectification and frequency conversion. This can affect nearby instruments and systems. To reduce EMI, enclose instruments in metal casings and ensure all components are properly grounded. Use shielded cables for wiring and ground the shielding layer. Poor EMI management can lead to system failure or damage to the control unit.

2) Input Overvoltage Protection: The inverter has built-in overvoltage protection on its input side, but prolonged exposure to high voltage can still damage it. Always verify the input voltage, whether single-phase or three-phase, and match it with the inverter’s rated voltage. In areas with unstable power supply, a voltage stabilizer is essential to avoid serious consequences.

3) Grounding: Proper grounding is crucial for improving system sensitivity and reducing noise. The grounding terminal (E/G) of the inverter should have as low resistance as possible. The grounding conductor should be at least 2mm² in cross-section and no longer than 20m. The inverter's grounding must be separate from power equipment grounds. The signal cable shield should connect to E/G, but not to the ground on the other end, to avoid signal fluctuations and system instability. Ensure the inverter and control cabinet are electrically connected; if difficult, use copper wire as a bridge.

4) Lightning Protection: Most inverters include a lightning absorption network to protect against surges. However, in areas with frequent lightning or when power lines are overhead, additional protection is necessary. Install a dedicated lightning arrester at the incoming line or bury a steel pipe 20 meters away from the inverter. For cable-fed systems, ensure the control room has adequate lightning protection. These measures can significantly reduce the risk of lightning damage.