3–12

“A” Group: Standard Functions

Basic Parameter Settings

Configuring

Drive Parameters

 

 

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 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).

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A003

 

 

 

 

 

 

 

 

 

A003

 

A004

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A004

100%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Constant torque

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

f

0

 

 

 

f

 

 

 

 

 

 

 

 

 

 

Base

Maximum

 

Base frequency =

 

Frequency

Frequency

 

maximum frequency

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.

 

 

“A” Function

Run

 

Defaults

 

 

 

 

 

 

 

 

 

Func.

Name /

Description

Mode

–FEF

–FU

 

Units

Edit

 

Code

SRW Display

(EU)

(USA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A003

Base frequency setting

Settable from 30 Hz to the

✘

50.0

60.0

 

Hz

 

 

 

maximum frequency

 

 

 

 

 

 

F-BASE

00060Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A203

Base frequency setting,

Settable from 30 Hz to the 2nd

✘

50.0

60.0

 

Hz

 

2nd motor

 

maximum frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2F-BASE

00060Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A004

Maximum frequency

Settable from the base

✘

50.0

60.0

 

Hz

 

setting

 

frequency up to 400 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F-MAX

00060Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A204

Maximum frequency

Settable from the 2nd base

✘

50.0

60.0

 

Hz

 

setting, 2nd motor

frequency up to 400 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2F-MAX

00060Hz