Asynchronous Motor (Asm): Identify Lh Saturation Characteristic - Lenze i950 Commissioning Manual

13.7.3

Asynchronous motor (ASM): Identify Lh saturation characteristic

In case of an asynchronous motor, the relationship between current and torque is basically
determined by the saturation behaviour of the mutual inductance. If the achieved torque
accuracy, especially in the field weakening range should not be sufficient, the accuracy can be
increased by the individual identification of the saturation characteristic. This behaviour can
be measured by the servo inverter.
Conditions for the execution
Before this commissioning function is executed, the inverter characteristic and the motor
•
parameters must be identified
The motor may be stalled.
•
The inverter is error-free and in
•
Response of the motor during "standstill" performance
How to identify the L saturation characteristic:
h
The identification of the L
1. If the servo inverter enabled, disable it .
2. Select the drive mode [10] in parameter 0x2825: Lh saturation characteristic identification
3. Enable the inverter to start the process.
Check the progress in 0x2823:002.
•
Disabling the inverter serves to abort the started procedure any time if required.
•
Already determined characteristic values are rejected in this case.
After successful completion...
...the inverter will be disabled automatically and the points of the determined L
characteristic are set in the parameters
Save the changed settings.
•
The »EASY Starter« serves to save the parameter settings of the servo inverter as parame-
ter file (*.gdc).4Saving the parameter settings
The inverter disable set automatically by the procedure can be deactivated again via the
•
CiA402 control word 0x6040
In the event of an error
If an error occurs during the procedure or the pulse inhibit gets active (e.g. due to short-time
undervoltage), the procedure is terminated with inverter disable without the settings being
changed.
Load standard L saturation characteristic
h
If an incorrect L saturation characteristic has been determined or none at all, it is possible to
h
load a standard L characteristic.
h
How to load the standard L
1. The start is made via the parameter
2. For permanent storage: after the process has been completed, save the L
acteristic set in .
The »EASY Starter« serves to save the parameter settings of the inverter as parameter file
(*.gdc). Saving the parameter settings
Asynchronous motor (ASM): Identify Lh saturation characteristic
4Motor equivalent circuit diagram
"Switched on" device state.
saturation characteristic can take up to 11 minutes.
h
0x2C07:001 ... 0x2C07:017.
^ 36
(setting = 7, 15).
saturation characteristic:
h
0x2822:021 = 1.
Configuring the motor control
Fine adjustment of the motor model
data.
^ 239
saturation
h
saturation char-
h
257