text: <s>[INST] PF525 EMC Filter - Internal vs External Is there a performance difference between the EMC Internal Filter vs the EMC External Filter? [/INST] Hi , Best performance is achieved by using a filtered drive and the appropriate external EMC filter. EMC filters reduce the transfer of electromagnetic noise between the drive and mains power supply. PF525 drives are fitted as standard with an internal EMC filter (240V , 480V) and for most industrial applications, this will be sufficient. In the event that a higher level of filtering is desired or required, the external EMC filter can be added to either a drive which already has the internal EMC filter, or a drive without EMC filter. Most electronic equipment will generate electrical noise, small unwanted disturbances which may be conducted back onto the mains power supply. Drives basically designed to minimise this noise transfer, and offer high levels of Electro Magnetic Compatibility. Where required, additional (External) EMC Filters may be added to further reduce the level of noise transferred back to the mains power supply, reducing the risk of other equipment being affected. however where highly sensitive equipment is used, or a reduction in the electrical noise is required, these External EMC filters can be fitted in line with the drive to reduce the conducted noise emission. *****Welcome your suggestions***** \\n </s>