4–65

SJ300 Inverter

Setting Motor Constants for Vector Control

Introduction

These advanced torque control algorithms improve performance, particularly at low speeds:

 

• Sensorless Vector Control – improved torque control at output frequencies down to 0.5 Hz.

 

Use A044=03 (1st motor) or A244=03 (2nd motor) to select sensorless vector control.

 

• Sensorless Vector Control, 0Hz Domain – improved torque control at output frequencies

 

from 0 to 2.5 Hz. Use A044=04 (1st motor) or A244=04 (2nd motor) to select sensorless

 

vector control, 0Hz domain.

 

 

 

• Vector Control with Feedback – improved torque control at all speeds, while providing the

 

most accurate speed regulation of all torque control algorithms. Use A044=05 to select

 

vector control with feedback.

 

 

 

These three control algorithms require the inverter’s motor constants to accurately match the

 

characteristics of the particular motor connected to your inverter. Simply using the inverter’s

 

default parameters with the vector control modes may not produce satisfactory results. The

 

auto-tuning procedure described later in this section is recommended for most applications

 

needing vector control. It determines and records the characteristics of the attached motor.

 

However, it is possible to enter the motor constants directly if the motor manufacturer has

 

provided that data.

 

 

 

After performing an initial auto-tuning procedure for your motor, you have an additional

 

option: adaptive tuning. The adaptive tuning parameters use the auto-tuning procedure’s results

 

as starting values. Then, each time the motor runs normally in your application, the inverter

 

tunes the parameters again to match the motor. This compensates for temperature changes, etc.,

 

further optimizing the values.

 

 

 

The following table lists the parameters associated with motor constant settings. Function H002

 

selects the set of motor constants that you want the inverter to use in normal use. Standard

 

constants (select with H002=00) include H020 to H024. Auto-tuned constants (select with

 

H002=01) include H030 to H034. Remember that you have to do the auto-tuning procedure in

 

this section before using either auto-tuned constants or the adaptive mode (H002=02).

 

 

 

 

 

 

Func.

Name

Data

Notes

 

 

 

 

 

 

 

 

 

 

 

 

 

00

V/f constant torque

 

 

 

 

 

 

 

 

01

V/f variable torque

 

A044 /

 

 

 

 

V/f characteristic curve selection,

02

V/f free-setting curve

 

A244 /

 

 

 

1st / 2nd / 3rd motors

03

Sensorless vector control (SLV)

 

A344

 

 

 

 

 

 

 

 

 

 

04

Sensorless vector control, 0Hz domain

 

 

 

 

 

 

 

 

05

Vector control with encoder feedback

 

 

 

 

 

 

H002

Motor data selection, 1st motor

00

Standard motor parameters

 

 

 

 

 

 

 

 

01

Auto-tuning parameters

 

 

 

 

 

 

 

 

02

Adaptive tuning parameters

 

 

 

 

 

 

H003

Motor capacity, 1st motor

0.2 – 75,

kW, up to –550xxx models

 

 

0.2 – 160

kW, –750xxx to –1500xxx models

 

 

 

 

 

 

 

 

 

H004

Motor poles setting, 1st motor

2 / 4 / 6 / 8

Units: poles

 

 

 

 

 

 

H020

Motor constant R1, 1st motor

0.000–65.53

Units: ohms

 

 

 

 

 

 

H021

Motor constant R2, 1st motor

0.000–65.53

Units: ohms

 

 

 

 

 

 

H022

Motor constant L, 1st motor

0.00–655.3

Units: mH

 

 

 

 

 

 

H023

Motor constant Io, 1st motor

0.00–655.3

Units: A

 

 

 

 

 

 

H024

Motor constant J, 1st motor

0.001–9999

Units: kgm2

 

H030

Auto-tuned constant R1, 1st motor

0.000–65.53

Units: ohms

 

 

 

 

 

Operations Monitoring and