Fuji Electric frenic mini series, Руководство пользователя

Страница: 172 / 269

9.2 Details of Function Codes
9-15
Chap. 9
FUNCTI
ON C
O
DE
S
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.
If the base frequency exceeds the maximum set frequency (F03/F05 or H50/H51),
the output voltage of the inverter will become constant when the output frequency
is higher than the base frequency. Refer to Figures (1) and (2) below.
(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