g. One Local Maintenance Bypass Switch. The switch is located on the transformer module rear panel and provides a manual means of placing the UPS into bypass mode to allow for servicing to be performed on the UPS and battery modules.
2.0FN RACKMOUNT UPS CIRCUIT DESCRIPTIONS Galvanically Isolated Output
The FN
Additionally, the FN galvanic output isolation in conjunction with a derived neutral greatly reduces common mode noise and ground loops.
Input & Power Factor Correction
All FN rackmount models require a 2 wire plus ground type
While the FN Series UPS is operating from the utility power, it’s internal power factor correction circuit converts utility AC power into regulated DC power for inverter use. The circuit also corrects the input current to maintain the phase relationships between both current and voltage sine waveforms. this also minimize the amount of current distortion that is reflected back to the utility line.
DC/DC Converter
The DC/DC converter utilizes energy from the batteries and boosts up the DC voltage to a level required by the inverter. This allows the inverter to operate continuously at optimum efficiency and voltage. The converter incorporates a patented circuit which reduces the amount of ripple current and EMI interference to the battery, increasing the overall battery life.
DC/AC Inverter
In utility mode operation, the inverter utilizes the regulated DC output and converts it back into clean, regulated sinewave AC power. When utility power fails, the inverter will receive its energy from the battery through the DC/DC converter. In both modes of operation, the UPS inverter is online and continuously generates clean, regulated AC output power to the load. The IGBT, PWM inverter is of a very robust design and produces a pure sinewave output with a
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