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SJ300 Inverter
Configuring Drive
Parameters
3–9
“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 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).
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 “
Configuring the Inverter for
Multiple Motors” on page 4–72.
Base
Frequency
Maximum
Frequency
Base frequency =
maximum frequency
A003 A004
A003
A004
t
t
00
100% 100%
V
V
Constant torque
“A” Function
Run
Mode
Edit
Lo Hi
Defaults
Units
SRW Display
Func.
Code
Name Description
–FE
(CE)
–FU
(UL)
–FR
(Jpn)
A001 Frequency source
setting
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
✘ ✘ 01 01 02 —
>A001 F-SET
SELECT TRM
A002 Run command source
setting
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
✘ ✘ 01 01 02 —
>A002 F/R
SELECT TRM
A003 Base frequency setting Settable from 30 Hz to the
maximum frequency
✘ ✘ 50. 60. 60. Hz
>A003 F-BASE
F 0060Hz