EMI-RFI Filters

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Electromagnetic interference (EMI), also known as radio frequency interference (RFI), poses a threat to the performance of electrical circuits by degrading, impairing, or preventing their optimal functioning. EMI filters play a crucial role in suppressing interference generated by devices or other equipment, safeguarding devices from environmental electromagnetic interference signals. Most EMI filters incorporate components to address both differential and common mode interference.

Enerdoor's EMI/RFI filters, organized into three product categories — single-phase, three-phase, and three-phase plus neutral filters — offer comprehensive solutions to protect and enhance equipment performance.

EMC Directive

Electromagnetic Compatibility (EMC) assesses the ability of equipment or systems to function in an electromagnetic environment without causing intolerable electromagnetic interference. EMC comprises emission and immunity aspects.

• Emission: Electromagnetic energy emitted from a source, like a device or system, must not exceed allowable levels set by the European EMC Directive 2014/30/EU.
• Immunity: The capability of a machine, equipment, or system to operate without degrading its functions when exposed to electromagnetic interference.

Various countries, including Europe (CE mark), the United States (FCC), China (CCC), Japan (VCCI), Australia & New Zealand (RCM), and South Korea (KCC), have established regulations to minimize radio-frequency interference between electronic equipment.

Example of a typical high-frequency disturbance generated by an automated machine operating without and with filtering necessary to comply with the European EMC Directive Framework 2014/30/EU limits.

General Classification of Interference

1. Conducted and Radiated Interference

   • Conducted interference: Physical contact of undesirable voltage or current signals entering or exiting a device through its own electric conductors.
   • Radiated interference: Occurs without physical contact; electric circuits act as aerials inducing voltage interference in an electromagnetic field.

2. Common Mode and Differential Mode Interference

   • Common mode interference: Signal measured between all conductors of an electric circuit connected together and a common reference (usually earth).
   • Differential mode interference: Signal measured between two independent conductors of the same electrical circuit.

Problems Generated by EMI-RFI Interference

• PLCs, sensors, encoders, and PCs failing
• Decreased life of sensitive components
• Production downtime
• Disturbance in other buildings/machines

Interference Classification

1. Conducted Interference due to Low-Frequency Phenomena

   • Mains 50/60 Hz harmonics and sub-harmonics
   • Signaling systems
   • Voltage variations, interruptions, and dips
   • Voltage unbalances
   • Mains 50/60 Hz frequency variations
   • Low-frequency induced voltage
   • DC components in AC
     
     

2. Conducted Interference due to High-Frequency Phenomena

   • Induced voltage or current (continuous or modulated waves)
   • Voltage transients (bursts)
   • Oscillatory transients (single or repetitive)
     
     

3. Radiated Interference due to Low-Frequency Phenomena

   • Magnetic fields (transients or continuous)
   • Electric fields
     
     

4. Radiated Interference due to High-Frequency Phenomena

   • Magnetic fields
   • Electric fields
   • Electromagnetic fields (transients, continuous, or modulated wave)

High-Frequency Solution

To safeguard and optimize equipment performance, Enerdoor offers an extensive range of filtering solutions to reduce electromagnetic/radio-frequency interference. With diverse electrical and mechanical characteristics, Enerdoor EMI/RFI filters cover a broad spectrum:

• Single-phase EMI/RFI filters: 1 to 75A with nominal voltage up to 690 Vac.
• Three-phase EMI/RFI filters: 1 to 3000A with nominal voltage up to 750 Vac.
• Three-phase plus neutral EMI/RFI filters: 1 to 2000A with nominal voltage up to 600 Vac.
• Parallel EMI/RFI filters: Enerdoor presents a unique solution for the specific frequency range of 10 KHz – 6 MHz, addressing severe risks of interference and disturbance.

Highly regarded for their effectiveness and adherence to international standards, Enerdoor's EMI/RFI filters stand as a reliable solution for minimizing electromagnetic interference, ensuring optimal equipment performance across a diverse range of applications. Elevate your equipment's reliability and mitigate the risks posed by interference with Enerdoor's cutting-edge filtering solutions.