F

Fast Charge Increasing the Operating Voltage after a battery discharge, following an AC failure, to give a rapid battery recharge. Typically at a constant current charge rate higher than .3C. (1/3 the batteries rated ampere-hour capacity)

Fault Tolerance The ability of a system to continue operating in the event of a fault.

Filtering A method of removing noise from the output of a UPS preventing “dirty power�? from reaching connected equipment.

Float Voltage The set output voltage of the DC power system (not including temperature compensation or other adjustments).

Frequency The number of cycles (oscillation positive and negative) completed in one second. Defined as Hertz. In North America, utility power completes 60 cycles per second, (60 Hertz).

Full Load The greatest load that a circuit is designed to carry under specific conditions; any additional load is considered an overload.