Sensorless Vector Control - Larsen & Toubro C*2000 Series User Manual

H41: When H41 is set to 1 and press the Enter key, Auto tuning is activated and "tUn" will appear on

the LED keypad. When finished, "H41" will be displayed.
 H42, H44: The values of motor stator resistance and leakage inductance detected in H41 are
displayed, respectively. When Auto tuning is skipped or H93 (Parameter initialize) is done, the default
value corresponding to motor type (H30) will be displayed.
Press the STOP key on the keypad or turn on the EST terminal to stop the Auto Tuning.

 If Auto tuning is interrupted, the default value will be set. If auto-tuning of leakage inductance is
interrupted, the measured value is used and the default of leakage inductance is set.
See page 8-16 for motor parameter default values.

Do not enter any incorrect value as stator resistance and leakage inductance. Otherwise,
the function of Sensorless vector control and Auto torque boost could be deteriorated.

8.9 Sensorless Vector Control

Group Code
Function
H40
group 2
H30
H32
H33
H34
H42
H44
Function
F14
Group 1
 If H40 – [Control mode select] is set to 3, Sensorless vector control will become active.
Motor parameters should be set for high performance. It is highly recommended Auto tuning be
done prior to proceeding operation via Sensorless vector control.
 Ensure that the following parameters are entered correctly for high performance in Sensorless vector
control.
H30: Select motor type connected to inverter output.

H32: Enter rated slip frequency based on motor nameplate RPM and rated frequency (See 8-8).

H33: Enter motor nameplate rated current.

 H34: After removing the load, select H40 – [Control mode select] to 0 9V/F control) and run the motor
at 60Hz. Enter the current displayed in Cur-[Output current] as motor no load current. If it is difficult to
Cx2000 AC Drive
Caution
Item
Control mode select
Motor type select
Rated slip frequency
Motor rated current
Motor No Load Current
Stator resistance (Rs)
Leakage inductance (Lσ)
Time for energizing a motor
Caution
Set Value Setting Range
3 0 ~ 3
- 0.1 ~ 11.0
- 0~ 10
- 0.5 ~ 150
- 0.1 ~ 50
- 0 ~ 56
- 0 ~ 600.0
- 0.0~60.0
Chapter 8 Application
Initial Unit
0 -
- kW
- Hz
- A
- A
-
- mH
0.5 Sec
8-15