Hitachi SJ2002 Series Instruction Manual page 92

3–12
"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 at the base frequency. 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. This is the
constant-power operating range. 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
Motors" on page
Func.
Code SRW Display
A003 Base frequency setting
F-BASE
A203 Base frequency setting,
2nd motor
2F-BASE
A004 Maximum frequency
setting
F-MAX
A204 Maximum frequency
setting, 2nd motor
2F-MAX
A003 A004
Base Maximum
Frequency Frequency
4–59.
"A" Function
Name /
Settable from 30 Hz to the
maximum frequency
00060Hz
Settable from 30 Hz to the 2nd
maximum frequency
00060Hz
Settable from the base
frequency up to 400 Hz
00060Hz
Settable from the 2nd base
frequency up to 400 Hz
00060Hz
V
100%
Constant torque
0
f
"Configuring the Inverter for Multiple
Run
Mode
Description
Edit
✘ ✘
✘ ✘
✘ ✘
✘ ✘
A003
A004
f
Base frequency =
maximum frequency
Defaults
–FE(F) –FU
Units
(EU) (USA)
50.0 60.0 Hz
50.0 60.0 Hz
50.0 60.0 Hz
50.0 60.0 Hz