Lenze i950

13.7.3 Asynchronous motor (ASM): Idenfy Lh
saturaon characterisc
In case of an asynchronous motor, the relaonship between current and torque is basically
determined by the saturaon behaviour of the mutual inductance. If the achieved torque
accuracy, especially in the eld weakening range should not be sucient, the accuracy can be
increased by the individual idencaon of the saturaon characterisc. This behaviour can
be measured by the servo inverter.
Condions for the execuon
•
Be
fore this commissioning funcon is executed, the inverter characterisc and the motor
par
ameters must be idened 4Motor equivalent circuit diagram data. ^ 263
•
The motor may be stalled.
•
The inverter is error-free and in "Switched on" device state.
Response of the motor during "standsll" performance
How to idenfy the L
h
saturaon characterisc:
The
idencaon of the L
h
saturaon characterisc can take up to 11 minutes.
1.
If the ser
vo inverter enabled, disable it .
2.
Select the drive mode [10] in parameter 0x2825: Lh saturaon characterisc idencaon
3.
Enable the in
verter to start the process.
•
Check the progress in 0x2823:002.
•
Disabling the inverter serves to abort the started procedure any me if required.
Alr
eady determined characterisc values are rejected in this case.
Aer successful compleon...
...the inverter will be disabled automacally and the points of the determined L
h
saturaon
characterisc are set in the parameters 0x2C07:001 ... 0x2C07:017.
•
Sa
ve the changed
sengs.
The »EASY Starter« serves to save the parameter sengs of the servo inverter as parame-
ter le (*.gdc).4Sa
ving the parameter sengs ^ 36
•
The inverter disable set automacally by the procedure can be deacvated again via the
CiA402 control word 0x6040 (seng = 7, 15).
In the event of an error
If an error occurs during the procedure or the pulse inhibit gets acve (e.g. due to short-me
undervoltage), the procedure is terminated with inverter disable without the sengs being
chang
ed.
Load standard L
h
saturaon characterisc
If an incorrect L
h
saturaon characterisc has been determined or none at all, it is possible to
load a standard L
h
characterisc.
How to load the standard L
h
saturaon characterisc:
1.
The s
tart is made via the parameter 0x2822:021 = 1.
2.
For permanent storage: aer the process has been completed, save the L
h
saturaon char-
acterisc set in .
The »EASY Starter« serves to save the parameter sengs of the inverter as parameter le
(*.gdc). Saving the parameter sengs
Conguring the motor control
Fine adjus
tment of the motor model
Asynchronous motor (ASM): Idenfy Lh saturaon characterisc
281