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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
switch 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 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 (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 table 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 4-58.
“A” Function Defaults
Func.
Code
Name /
SRW Display
Description
Run
Mode
Edit
-FE
(EU)
-FU
(USA)
Units
Base frequency settingA003
F-BASE 00060Hz
Settable from 30 Hz to the
maximum frequency(A004)
U
50.0 60.0 Hz
Base frequency setting,
2nd motor
A203
2F-BASE 00060Hz
Settable from 30 Hz to the 2nd
maximum frequency(A204)
U
50.0 60.0 Hz
Maximum frequency settingA004
F-MAX 00060Hz
Settable from the base
frequency to 400 Hz
U
50.0 60.0 Hz
Maximum frequency setting,
2nd motor
A204
2F-MAX 00060Hz
Settable from the 2nd base
frequency to 400 Hz
U
50.0 60.0 Hz
V
100%
A003 A004
0
Base
Frequency
Maximum
Frequency
f
V
100%
A003
A004
0
Base Frequency =
Maximum Frequency
f
3−12
Configuring Drive
Parameters