A" Group: Standard Functions - Hitachi L100 Instruction Manual

3–10

"A" Group: Standard Functions

"A" Group: Standard Functions

Basic Parameter Settings
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).
Func.
Code
A01 Frequency source
setting
A02 Run command source
setting
A03 Base frequency
setting
A04 Maximum frequency
setting
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V
A03
100%
0
Base
Frequency
"A" Function
Name
Three options; select codes:
00 ...Keypad potentiometer
01 ...Control terminal
02 ...Function F01 setting
Two options; select codes:
01 ...Control terminal
02 ...Run key on keypad, or
digital operator
Settable from 50 Hz to the
maximum frequency
Settable from the base
frequency up to 360 Hz
V
A04
100%
Constant torque
f
0
Maximum
Frequency
Run-
time
Description
Edit
A03
A04
Base frequency =
maximum frequency
Defaults DOP,DRW,DOP+
EU/ Func.
Units Name
US Code
01 — Mon. F-SET-
SELECT
01 — Mon. F/R-
SELECT
50/60 Hz F-00 F-BASE
50/60 Hz F-01 F-MAX
f