Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-17
(3) Free V/f characteristic setting
The free V/f characteristic setting function allows you to set an arbitrary V/f characteristic by specifying
the voltages and frequencies (b100 to b113) for the seven points on the V/f characteristic curve.
The free V/f frequencies (1 to 7) set by this function must always be in the collating sequence of
"1 ≤ 2 ≤ 3 ≤ 4 ≤ 5 ≤ 6 ≤ 7".
Since all free V/f frequencies are set to 0 Hz as default (factory setting), specify their arbitrary values
(begin setting with free-setting V/f frequency (7)). (The inverter cannot operate with the free V/f characteristic
in the factory setting.)
Enabling the free V/f characteristic setting function disables the torque boost selection (A041/A241),
base frequency setting (A003/A203/A303), and maximum frequency setting (A004/A204/A304).
(The inverter assumes the value of free-setting V/f frequency (7) as the maximum frequency.)
Item
Function code
Data
Description
Free-setting V/f frequency (7)
b112
0.to 400.(Hz)
Setting of the output
frequency at each
breakpoint of the V/f
characteristic curve
Free-setting V/f frequency (6)
b110
0. to free-setting V/f frequency (7) (Hz)
Free-setting V/f frequency (5)
b108
0. to free-setting V/f frequency (6) (Hz)
Free-setting V/f frequency (4)
b106
0. to free-setting V/f frequency (5) (Hz)
Free-setting V/f frequency (3)
b104
0. to free-setting V/f frequency (4) (Hz)
Free-setting V/f frequency (2)
b102
0. to free-setting V/f frequency (3) (Hz)
Free-setting V/f frequency (1)
b100
0. to free-setting V/f frequency (2) (Hz)
Free-setting V/f voltage (7)
b113
0.0 to 800.0(V)
Setting of the output
voltage at each
breakpoint of the V/f
characteristic curve (*1)
Free-setting V/f voltage (6)
b111
Free-setting V/f voltage (5)
b109
Free-setting V/f voltage (4)
b107
Free-setting V/f voltage (3)
b105
Free-setting V/f voltage (2)
b103
Free-setting V/f voltage (1)
b101
(Example)
*1 Even if 800 V is set as a free-setting V/f voltage (1 to 7), the inverter output voltage cannot exceed the inverter
input voltage or that specified by the AVR voltage select.
Carefully note that selecting an inappropriate control system (V/f characteristic) may result in overcurrent during
motor acceleration or deceleration or vibration of the motor or other machine driven by the inverter.
Output voltage (V)
Output frequency (Hz)
f1
f2
f3
f4
f5
f6
f7
0
V2,V3
V1
V5
V6
V7
V4
Voltage that can be output by the
inverter or that was specified by
the AVR voltage select
Output frequency (Hz)
Output voltage (V)
0
f6
f7
V6
V7