4–35

SJ100 Inverter

Auto-tuning for Sensorless Vector Control

The SJ100 inverter has a built-in auto-tuning algorithm. Its purpose is to detect and record the motor parameters to use in sensorless vector control. As you may recall from Chapter 3, sensorless vector control (SLV) is the more sophisticated control algorithm the SJ100 inverter can use to deliver higher torque levels at different speeds. Using parameter A_44, you can select from the following:

•00 = Variable frequency with constant torque

•01 = Variable frequency with reduced torque

•02 = Sensorless vector control (SLV)

NOTE: Although “auto-tuning” is often associated with PID loops, the PID loop in the SJ100 inverter is not directly affected by the auto-tuning procedure or parameters.

Most of the “H” Group parameters are dedicated to storing SLV parameters. The inverter comes from the factory with default settings for these parameters. To benefit fully from SLV control, you must use A_44 to select SLV control, and initiate the auto-tuning calibration procedure as described below for your motor. During the procedure, the inverter will write new values for the “H” Group settings related to SLV control. The settings have a second set of parameters for a second motor. The factory default configuration will apply auto-tuning to the first motor.

WARNING: You may need to disconnect the load from the motor before performing auto-tuning. The inverter runs the motor forward and backward for several seconds without regard to load movement limits.

Follow the steps below to auto-tune the inverter (table continued on next page):

 

Step

 

Parameter

Parameter Setting or Action

Notes

 

 

 

 

 

 

 

 

 

 

Code

Name

 

Monitoringand

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

F_02

Acceleration (1)

Set to a time greater than 10

Parameters F_02 and F_03 must

 

Operations

 

 

 

 

seconds

be equal in order for the moment

 

 

 

 

 

 

 

 

 

 

 

 

 

of inertia data to be correct.

 

 

 

 

2

F_03

Deceleration (1)

Set the same as setting F_02

 

 

 

 

Increase the time if over-current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or over-voltage trip event occurs.

 

 

 

 

 

 

 

 

 

 

 

 

 

3

H_03

Motor capacity

Varies with inverter (default

Setting is in kW

 

 

 

 

 

 

 

value will be correct)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

H_04

Motor poles

Set the poles 2 / 4 / 6 / 8 to

Refer to the motor specifications

 

 

 

 

 

 

setting

match motor

label

 

 

 

 

 

 

 

 

 

 

 

 

 

5

A_01

Frequency source

Set = 02 (selects parameter

The auto-tuning procedure will

 

 

 

 

 

 

setting

F_01 as source of output

automatically control the speed

 

 

 

 

 

 

 

frequency)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

A_03

Base frequency

Set = 50 or 60 for your motor

Default= 50 (Europe) / 60(US)

 

 

 

 

 

 

setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

A_20

Multi-speed

Set A_20 > 0

If A_20 = 0, auto-tuning is not

 

 

 

 

 

 

frequency setting

 

performed