Letter Fi

Filler Plates
Plates used to cover unused spaces in a panel.

Four-Quadrant Operation
Describes the operation of a variable speed drive that is capable
of providing forward or reverse torque with the motor rotating in
either the forward or reverse direction.

Frequency
The rate of variation of a periodic waveform. The symbol for
frequency is “f.” The unit for frequency is Hertz.

Full-Voltage Starter

A type of motor starter often used for three-phase induction
motors that applies the full line voltage to the motor
immediately. Sometimes called an across-the-line starter.