FujiFilm Frenic-Mini Instruction Manual page 89

Non-linear V/f pattern for voltage (H51)
Sets the non-linear V/f pattern for voltage component.
If the rated voltage at base frequency (F05) is set to 0, the data settings of func-
tion codes H50 and H51 will be ignored.
If you set the data of H50 to 25 Hz or lower (Operation under low base
frequency), the inverter output voltage may be limited.
Defining non-linear V/f patterns (F04, F05, H50 and H51)
Function codes F04 and F05 define a non-linear V/f pattern that forms the rela-
tionship between the inverter's output frequency and voltage.
Furthermore, setting the non-linear V/f pattern using function codes H50 and H51
allows patterns with higher or lower voltage than that of the normal pattern to be
defined at an arbitrary point inside or outside the base frequency. Generally, when
a motor is driven at a high speed, its internal impedance may increase and output
torque may decrease due to the decreased drive voltage. This feature helps you
solve that problem. Note that setting the voltage in excess of the inverter's input
source voltage is not allowed. (For the single-phase 100 V series, setting the volt-
age that is two times or more the inverter's input source voltage is not allowed.)
Normal (linear) V/f pattern
V/f pattern with single non-linear point inside the base frequency
You can also set the optional non-linear V/f range (H50: Frequency) for
frequencies exceeding the base frequency (F40).
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