Hitachi J300U Series instruction manual Frequency upper, lower limiter

Extension

function

code

Contents and display

Set the limits of frequency setting within the start frequency adjustment range and

maximum frequency setting range. When a value beyond the limits is inputted from the operator, it will not be stored. Even if a value beyond the limits is inputted as external analog input, the set value will not be changed.

Frequency upper, lower limiter

Maximum frequency limiter

2

FUNC

➤

➤

FUNC

Minimum frequency limiter

2

FUNC

➤

➤

FUNC

➤

➤

.

➤

➤

.

(400)

Setting example

1(When an upper limit of 45 Hz and a lower limit of 20 Hz are set)

Initial value	Output frequency
	(60 Hz)
	Upper limiter	45		range	➤
			Settable
(400)	Lower limiter	20	➤
1		0
					Frequency command
					(F-SET)

Initial value	NOTE: Setting conditions
	0 Hz or upper limit ≥ lower limit
	When 0 Hz is set, the limiters will not operate.

Jump frequency setting 1

Jump frequency setting 2

Jump frequency setting 3

To avoid a resonance with the load, the frequencies at up to 3 points can be jumped. The setting order and the execution order may be changed.

The frequency equivalent to the jump frequency setting width (± 0.5 Hz) (Note 1) cannot be set as a jump frequency.

NOTE 1 : The jump frequency can be set by the remote operator.

NOTE 2 : As to the frequencies which are set by the jump frequency setting function, the set frequencies are jumped but the output frequencies pass.

					Setting example
f		f			Jump frequency 1: 10 Hz
					Jump frequency 2: 30 Hz
	➤	➤	➤		Jump frequency 3: 45 Hz
➤				Output	Jump frequency width: 0.5 Hz
➤	➤	➤		frequency	f
	➤
0		0

Set frequency (V)

Output frequency (V)

45

Adjustment range

➤

30

➤

In the case

In the case

of jump frequency 1

➤

of jump frequency 2

10

2

1

➤

In the case

0

FUNC

Initial value

(V)

of jump frequency 3

➤

➤

.

Speed command

Deceleration

➤

➤

0.5 Hz

➤

frequency

➤

Frequency which

FUNC

➤

➤ ➤

0.5 Hz

jumps by 1.0 Hz

➤

➤

➤

Acceleration

7-17