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“A” Group: Standard Functions
Configuring
Drive Parameters
3–12
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).
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 “
Configuring the Inverter for Multiple
Motors” on page 4–56.
Base
Frequency
Maximum
Frequency
Base frequency =
maximum frequency
VV
100% 100%
ff
Constant torque
00
A003 A004
A003
A004
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name /
SRW Display
Description
–FEF
(EU)
–FU
(USA)
Units
A003 Base frequency setting Settable from 30 Hz to the
maximum frequency
✘ 50.0 60.0 Hz
F-BASE 00060Hz
A203 Base frequency setting,
2nd motor
Settable from 30 Hz to the 2nd
maximum frequency
✘ 50.0 60.0 Hz
2F-BASE 00060Hz
A004 Maximum frequency
setting
Settable from the base
frequency up to 400 Hz
✘ 50.0 60.0 Hz
F-MAX 00060Hz
A204 Maximum frequency
setting, 2nd motor
Settable from the 2nd base
frequency up to 400 Hz
✘ 50.0 60.0 Hz
2F-MAX 00060Hz