An uninterruptable power supply or UPS may be a best way to provide stable power to a company network. Current UPS designs store energy in batteries in dc mode. When necessary, the device supplies power in ac mode, thanks to a dc-to-ac converter. It works in switch-mode and so generates electromagnetic noise, conducted and radiated, which affects its operation and nearby electronic devices. This electromagnetic emission has to meet limits established by applicable standards, and the environment in which it is supposed to work. Typical standard are EMC IEC 62040-2 and EN 50091-2.
One EMC test, for conducted emissions, measures noise in the power using a LISN. The measurement frequency is 150 kHz to 30 MHz and the maximum limit allowed depends on the applicable standard and the environment where the unit will work, domestic or industrial.
To overcome these conducted emission tests, Premo Group offers a wide range of EMC filters for UPS, with various ranges of current, voltage and filter stages, built according to UL1283 and EN60939-2 standards. The company offers a new PFT series, a three-phase UPS with neutral filter for three-phase power delivery without transformer. This PFT Series offers currents from 3 to 150A and working voltage to 520 Vac, 50 or 60 Hz, providing high common mode attenuation and differential, as well as low-leakage current. This family of filters offers a compact design and is available in different versions, with fast-on connection, screws, or terminal blocks. The filters have been developed to fulfill the specific needs of this application in terms of attenuation levels, volume, weight, and connections. Premo continuously improves its EMC filter designs, in collaboration with development centers, universities, suppliers and customers, innovating new technologies such as IPEM and introducing new magnetic materials (nanomaterials, and new alloys) for optimum results in operation mode, reliability, size and efficiency. Premo EMC has fixed an on-site laboratory to carry out the EMC tests in machines or installations of its customers. Solutions are suggested to fulfill a specific EMC standard. Download this product datasheet: http://www.grupopremo.com/es/file/73
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