A" Group: Standard Functions; Basic Parameter Settings - Hitachi SJ300 Series Instruction Manual

"A" Group: Standard Functions

Basic Parameter
These settings affect the most fundamental behavior of the inverter—the outputs to the motor.
Settings 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 development 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 characteris-
tic. The horizontal line over to the maximum frequency serves to let the motor run faster, but at
a reduced torque. This is the constant-horsepower part of the characteristic. 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" and "3rd motor" settings in the tables in this chapter store an alter-
nate set of parameters for additional motors. The inverter can use the 1st, 2nd, or 3rd set of
parameters to generate the output frequency to the motor. See
Multiple Motors" on page
"A" Function
Func.
Name
Code
A001 Frequency source
setting
A002 Run command source
setting
A003 Base frequency setting
A003 A004
Base Maximum
Frequency Frequency
4–72.
Description
Six options; select codes:
00 Keypad potentiometer
01 Control terminal
02 Function F001 setting
03 RS485 serial command
04 Expansion board 1
05 Expansion board 2
Five options; select codes:
01 Input terminal [FW] or
[RV] (assignable)
02 Run key on keypad, or
digital operator
03 RS485 serial command
04 Start/Stop, expansion
card #1
05 Start/Stop, expansion
card #2
Settable from 30 Hz to the
maximum frequency
V
100%
Constant torque
t
0
"Configuring the Inverter for
Defaults
Run
Mode
Edit
–FE –FU –FR
Lo Hi
(EU) (US) (JP)
✘ ✘
01 01 02
✘ ✘
01 01 02
✘ ✘
50. 60. 60.
3–9
SJ300 Inverter
A003
A004
t
Base frequency =
maximum frequency
SRW Display
Units
—
>A001 F-SET
SELECT TRM
— >A002 F/R
SELECT TRM
Hz >A003 F-BASE
F 0060Hz