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SJ300 Inverter

Auto-tuning of Motor Constants

The SJ300 inverter features auto-tuning, which detects and records the motor characteristic parameters to use in all vector control modes. Auto-tuning determines the resistance and inductance of motor windings. Therefore, the motor must be connected to the inverter for this proce- dure. Note that the auto-tuning feature is not associated with PID loop operation, which is common on some control devices. The auto-tuning procedure must be conducted while the inverter is stopped (not in Run mode), so it can use special output pulses to detect motor characteristics.

When using the inverter in sensorless vector control, sensorless vector control - 0Hz domain, or vector control with encoder feedback, the motor circuit constants are important. If they are unknown, then you must first conduct the auto-tuning procedure. The inverter will determine the constants and write new values for the related “H” Group settings. The auto-tuning procedure requires that the inverter be configured to operate the 1st motor (do not set the inverter to use 2nd and 3rd motor data during an auto-tuning procedure).

Func.

Name

Range

Notes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Auto-tuning setting

00

Disabled

 

 

 

 

 

 

 

 

 

 

H001

 

01

Enabled, without motor rotation

 

 

 

 

 

 

 

 

 

 

 

 

02

Enabled, with motor rotation

 

 

 

 

 

 

 

 

 

 

 

Motor data selection, 1st motor

00

Standard motor parameters

 

 

 

 

 

 

 

 

 

 

H002

 

01

Auto-tuning parameters

 

 

 

 

 

 

 

 

 

 

 

 

02

Adaptive tuning parameters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Motor capacity, 1st motor

0.2 – 75,

kW, up to –550xxx models

 

Monitoringand

 

H003

 

0.2 – 160

kW, –750xxx to –1500xxx

 

Operations

 

 

 

models

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H004

Motor poles setting, 1st motor

2 / 4 / 6 / 8

Units: poles

 

 

 

 

 

 

 

 

 

 

H030

Auto-tuned motor constant R1,

—

Units: ohms

 

 

 

1st motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H031

Auto-tuned motor constant R2,

—

Units: ohms

 

 

 

 

 

1st motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H032

Auto-tuned motor constant L,

—

Units: mH

 

 

 

1st motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H033

Auto-tuned motor constant Io,

—

Units: A

 

 

 

1st motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H034

Auto-tuned motor constant J, 1st

—

Units: kgm2

 

 

 

motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A003

Base frequency setting

30 to maximum freq.

Units: Hz

 

 

 

 

 

 

 

 

 

 

 

DC braking enable

00

Disabled (Disable during auto-

 

 

 

A051

 

 

tuning)

 

 

 

 

 

 

 

 

 

 

 

01

Enabled

 

 

 

 

 

 

 

 

 

 

 

AVR voltage select

200/215/220/230/240

Valid for 200V class inverters

 

 

 

A082

 

 

 

 

 

 

 

380/400/415/440/

Valid for 400V class inverters

 

 

 

 

 

 

 

 

 

 

460/480

 

 

 

 

 

 

 

 

 

 

 

Please read the following Warning before running the auto-tuning procedure on the next page.

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.