9-16
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 relationship 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 cannot be done.
(1) Normal (linear) V/f
pattern
(2) V/f pattern with single
non-linear point inside
the base frequency
(3) V/f pattern with single
non-linear point outside
the base frequency
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