Salicru SLC X-PERT Series User Manual

Salicru SLC X-PERT Series User Manual Manual pdf 10 page image

10SALICRU4.3. UPS NAMEPLATE.The SLC X-PERT UPS model features a nameplate containing itsoperating values. The nameplate is affixed to the inside of thedoor of the UPS.Fig. 4. Example of a nameplate for the SLC 200 X-PERT.Verification of technical specifications.Before carrying out any installation or startupoperations on the UPS, verify that its technical specificationsare compatible with the AC power line and output loads.4.4. DESCRIPTION OF THE UPS.The UPS described in this manual is on-line, double-conversion;the inverter included in the UPS always supplies power to theload, either with or without the availability of mains power(according to the backup time of the batteries).This configuration guarantees the best service to the user,supplying clean energy in an uninterrupted way, and ensuringvoltage and frequency stabilisation at a rated value. Thanksto its double conversion, the critical loads will be completelyimmune to micro interruptions and mains variations, preventingdamage to critical loads (computers, instruments, scientificdevices, etc.).Presence of voltage at the output.The line connected to the UPS output is energised evenduring mains failures, so, in accordance with IEC EN62040-1-2,the installer must identify the line or sockets powered by theUPS, alerting users of the existence of a UPS in the facility.MainsMains OutputFig. 5. Block diagram of the SLC X-PERT UPS.The UPS uses high frequency switching IGBT technologythat allows very low distortion of the current feed back intothe supply line, as well as high-quality and stable outputvoltage. The components used ensure high reliability, excellentefficiency and ease of maintenance.4.5. OPERATING PRINCIPLE.4.5.1. Rectifier.The rectifier converts three-phase AC mains voltage intodirect DC voltage. It uses a fully controlled three-phase IGBTbridge with low harmonic absorption. The control electronicsuses a state-of-the-art 32-bit microprocessor (μP) that enablesreduction of the harmonic distortion of the current absorbed inthe mains (THDi) to less than 3%. This ensures that the rectifierdoes not distort the supply network with respect to the otherloads. It also prevents cable overheating caused by circulationof harmonic currents.The rectifier is designed to power the inverter under full loadand also charge the batteries with the maximum rechargecurrent.4.5.2. Inverter.The inverter converts the DC voltage from the rectifier orbatteries into alternating AC voltage, stabilised in amplitudeand frequency.The inverter uses IGBT technology in the power converter, with3 levels for powers between 200... 400 kVA, and a switchingfrequency of 7.5 kHz.The control electronics uses a state-of-the-art 32-bit micro-processor that, thanks to its processing capacity, generates aperfect sine-wave output waveform.In addition, the fully digital control of the sine-wave outputwaveform provides high functionalities, including very lowvoltage distortion (linear load <1%, non-linear load <5% as perEN62040-3), even in the presence of highly distorting loads.4.5.3. Batteries and battery charger.The batteries must be installed outside the UPS, usually in anexternal cabinet or bank.The logic of the battery charger is fully integrated in the rectifiercontrol electronics.The batteries are charged according to standard DIN41773,every time they have been partially or completely discharged.When their total capacity is restored, they disconnect fromthe DC bus by means of a static switch to save energy andreduce stress due to AC ripple, enabling their service life to