A" Group: Standard Functions - Hitachi SJ7002 Series Instruction Manual

3–10

"A" Group: Standard Functions

"A" Group: Standard Functions

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