Hitachi L100 사용자 설명서

L100 Inverter

Conf

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Dr
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These settings affect the most fundamental behavior of the inverter—the outputs to the 
motor. The frequency of the inverter’s AC output determines the motor speed. You may 
select from three different sources for the reference speed. During application develop-
ment you may prefer using the potentiometer, but you may switch to an external source 
(control terminal setting) in the finished application, for example.

The base frequency and maximum frequency settings interact according to the graph 
below (left). The inverter output operation follows the constant V/f curve until it reaches 
the full-scale output voltage. This initial straight line is the constant-torque part of the 
operating characteristic. The horizontal line over to the maximum frequency serves to let 
the motor run faster, but at a reduced torque. If you want the motor to output constant 
torque over its entire operating range (limited to the motor nameplate voltage and 
frequency rating), then set the base frequency and maximum frequency equal as shown 
(below right).

Base

 Frequency

Maximum

 Frequency

Base frequency = 
maximum frequency

A 03

A 04

A 03

A 04

V

V

100%

100%

f

f

Constant torque

0

0

A_01 Frequency source 

setting

 Three options; select codes:
00 ...Keypad potentiometer
01 ...Control terminal
02 ...Function F01 setting

✘

01

01

00

—

F-SET-SELECT TRM

A_02 Run command source 

setting

Two options; select codes:
01 ...Control terminal
02 ...Run key on keypad, or
         digital operator

✘

01

01

02

—

F/R SELECT TRM

A_03 Base frequency setting

Settable from 50 Hz to the 
maximum frequency

✘

50.0

60.0

60.0

Hz

F-BASE     060Hz

A_04 Maximum frequency 

setting

Settable from the base 
frequency up to 360 Hz

✘

50.0

60.0

60.0

Hz

F-MAX      060Hz