Single-Phase EMI-RFI Filters

May 17, 2018

EMI-RFI filters are typically installed on the main power line. However, did you know that single-phase filters may also be used to protect the power supply, PLCs, and sensors? 

The Challenge   

Switching devices within a machine generate radio frequency (RF) noise which travels back to the power line of the facility. When an EMI-RFI filter is installed, it blocks this RF noise. However, did you know that EMI-RFI filters can also protect equipment from RF interference and voltage spikes that could be coming IN from surrounding equipment? Larger facilities have several different types of equipment which create RF interference and voltage spikes that affect other devices. Imagine a power supply installed inside a machine located in a large facility surrounded by other large pieces of equipment. How do you think the output supply and sensors are affected?

The Solution   

To minimize the risk of interference, install an EMI-RFI filter on the power line. For example, in a three-phase machine application, the filter would not protect the entire machine. It would protect the two-phase power line, including the power supply, PLCs and sensors.      

The Result   

A compact EMI-RFI filter on the power supply input reduces the risk of noise interference in the field and increases machinery life. 

EMI-RFI Filters   

To protect and optimize equipment, Enerdoor EMI-RFI filters provide solutions in three product categories: single-phase, three-phase, and three-phase plus neutral filters.

Motor Protection   

Enerdoor developed the Motor Protection series to protect motors from harmful overvoltage and dV/dt spikes generated on the output. This is useful for applications with VFDs and servo motors. 

CE Certification   

Enerdoor specializes in EMC testing and CE Certification. Our flat rate testing service is unique in the industry, as is our pledge to not leave the facility until equipment is compliant.