Hitachi SJ700-2 To 400.Hz Free-setting V/f frequency, To free-setting V/f frequency 7 Hz

Chapter 4 Explanation of Functions

(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)
Free-setting V/f frequency (6)	b110	0. to free-setting V/f frequency (7) (Hz)	Setting of the output
Free-setting V/f frequency (5)	b108	0. to free-setting V/f frequency (6) (Hz)
			frequency at each
Free-setting V/f frequency (4)	b106	0. to free-setting V/f frequency (5) (Hz)
			breakpoint of the V/f
Free-setting V/f frequency (3)	b104	0. to free-setting V/f frequency (4) (Hz)
			characteristic curve
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
Free-setting V/f voltage (6)	b111		Setting of the output
Free-setting V/f voltage (5)	b109
		0.0 to 800.0(V)	voltage at each
Free-setting V/f voltage (4)	b107
			breakpoint of the V/f
Free-setting V/f voltage (3)	b105
			characteristic curve (*1)
Free-setting V/f voltage (2)	b103
Free-setting V/f voltage (1)	b101

(Example)

Output voltage (V)

V7

V6

V5

V4

V1

V2,V3

								Output frequency (Hz)
0	f1	f2	f3	f4	f5	f6	f7

*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)

V7

Voltage that can be output by the inverter or that was specified by the AVR voltage select

V6

0 f6 f7 Output frequency (Hz)

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