“A” Group: Standard Functions
Configur
ing Dr
iv
e
P
a
ra
meters
3–10
“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 4–76
.
Base
Frequency
Maximum
Frequency
Base frequency =
maximum frequency
A003
A004
A003
A004
t
t
0
0
100%
100%
V
V
Constant torque
Func.
Code
Name/
Description
Keypad
Range and Settings
Defaults
Run
Mode
Edit
Lo Hi
SRW
OPE
FEF2
FE2
(EU)
FUF2
FU2
(USA)
FF2
F2
(Jpn)
A001
Frequency source setting
VR
00
Keypad potentiometer
01
01
02
✘ ✘
TRM
0 1
Control terminal
REM
02
Function F001 setting
RS485
03
RS485 serial command
OP1
04
Expansion board 1
OP2
05
Expansion board 2
PLS
06
Pulse train input
PRG
07
Easy sequence
MATH
10
Calculate function input
A002
Run command source setting
TRM
0 1
Input terminal [FW] or [RV] (assignable)
01
01
02
✘ ✘
REM
02
Run key on keypad of digital operator
RS485
03
RS485 serial command
OP1
04
Start/Stop, expansion card #1
OP2
05
Start/Stop, expansion card #2