A" Group: Standard Functions - Hitachi SJ100 Series 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).
V
100%
0
NOTE: The "2nd motor" settings in the tables in this chapter store an alternate set of
parameters for a second motor. The inverter can use the 1st set or 2nd set of parameters
to generate the output frequency to the motor. See the section on page 4–34 on configur-
ing the inverter to operate with two motors.
Func.
Name
Code
A01 Frequency source
setting
A02 Run command source
setting
A03 Base frequency
setting
A203 Base frequency
setting, 2nd motor
A03 A04
Base Maximum
Frequency Frequency
"A" Function
Description
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 50 Hz to the
maximum frequency
V
100%
Constant torque
f
0
Base frequency =
maximum frequency
Defaults
Run-
time
EU/
Edit
US
✘
01
✘
01
✘
50/60
✘
50/60
A03
A04
f
DOP,DRW,DOP+
Func.
Units Name
Code
— Mon. F-SET-
SELECT
— Mon. F/R-
SELECT
Hz F-00 F-BASE
Hz F00 2F-BASE