SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
(3) Free V/f characteristic setting<br />
The free V/f characteristic setting function allows you to set an arbitrary V/f characteristic by specifying the<br />
voltages and frequencies (b100 to b113) for the seven points on the V/f characteristic curve.<br />
The free V/f frequencies (1 to 7) set by this function must always be in the collating sequence of "1 ≤ 2 ≤ 3<br />
≤ 4 ≤ 5 ≤ 6 ≤ 7".<br />
Since all free V/f frequencies are set to 0 Hz as default (factory setting), specify their arbitrary values<br />
(begin setting with free-setting V/f frequency (7)). (The inverter cannot operate with the free V/f<br />
characteristic in the factory setting.)<br />
Enabling the free V/f characteristic setting function disables the torque boost selection (A041/A241), base<br />
frequency setting (A003/A203/A303), and maximum frequency setting (A004/A204/A304). (The inverter<br />
assumes the value of free-setting V/f frequency (7) as the maximum frequency.)<br />
Item Function code Data Description<br />
Free-setting V/f frequency (7) b112 0.to 400.(Hz)<br />
Free-setting V/f frequency (6) b110 0. to free-setting V/f frequency (7) (Hz)<br />
Free-setting V/f frequency (5) b108 0. to free-setting V/f frequency (6) (Hz)<br />
Free-setting V/f frequency (4) b106 0. to free-setting V/f frequency (5) (Hz)<br />
Free-setting V/f frequency (3) b104 0. to free-setting V/f frequency (4) (Hz)<br />
Free-setting V/f frequency (2) b102 0. to free-setting V/f frequency (3) (Hz)<br />
Free-setting V/f frequency (1) b100 0. to free-setting V/f frequency (2) (Hz)<br />
Free-setting V/f voltage (7)<br />
Free-setting V/f voltage (6)<br />
Free-setting V/f voltage (5)<br />
Free-setting V/f voltage (4)<br />
Free-setting V/f voltage (3)<br />
Free-setting V/f voltage (2)<br />
Free-setting V/f voltage (1)<br />
b113<br />
b111<br />
b109<br />
b107<br />
b105<br />
b103<br />
b101<br />
0.0 to 800.0(V)<br />
Setting of the output<br />
frequency at each<br />
breakpoint of the V/f<br />
characteristic curve<br />
Setting of the output<br />
voltage at each<br />
breakpoint of the V/f<br />
characteristic curve (*1)<br />
(Example)<br />
Output voltage (V)<br />
V7<br />
V6<br />
V5<br />
V4<br />
V1<br />
V2,V3<br />
0<br />
f1 f2 f3 f4 f5 f6 f7<br />
Output frequency (Hz)<br />
*1 Even if 800 V is set as a free-setting V/f voltage (1 to 7), the inverter output voltage cannot exceed the<br />
inverter input voltage or that specified by the AVR voltage select.<br />
Carefully note that selecting an inappropriate control system (V/f characteristic) may result in<br />
overcurrent during motor acceleration or deceleration or vibration of the motor or other machine driven<br />
by the inverter.<br />
Output voltage (V)<br />
V7<br />
Voltage that can be output by the<br />
inverter or that was specified by<br />
the AVR voltage select<br />
V6<br />
0 f6 f7<br />
4 - 17<br />
Output frequency (Hz)
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