5 Motor control & motor settings
5.12 Fine adjustment des motor model
139
Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06
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5.12.3 Asynchronous motor (ASM): Identifying the 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
i700 servo inverter.
Preconditions for the execution
• Before this commissioning function is executed, the inverter characteristic and the motor
parameters have to be identified.
Compensating for inverter influence on output voltage
( 65)
Determine motor parameters automatically via "motor parameter identification"
( 72)
• The motor may be firmly braked.
• The servo inverter is free of errors and is in the "Switched on
" device status.
Response of the motor during the execution
Standstill
How to identify the LH saturation characteristic:
1. If the servo inverter is enabled, inhibit the servo inverter.
Enable/inhibit operation via control word
( 52)
2. Set object 0x2825
(or 0x3025 for axis B) to "10" to change to the "Determine Lh saturation
characteristicn" operating mode.
3. Enable the servo inverter to start the procedure.
Notes:
• The identification of the Lh saturation characteristic can take up to 11 minutes. The
progress can be checked in the object 0x2823
(or 0x3023 for axis B).
• By means of controller inhibit, the started procedure can be cancelled any time, if
required. Characteristic values that have already been determined are rejected in this
case.
After successful completion...
...the controller will be inhibited automatically and the points of the determined LH characteristic
will be set in object 0x2C07
(or 0x3407 for axis B).
• For permanent storage, the changed settings must be uploaded to the controller from the i700
servo inverter.
The »EASY Starter« serves to save the parameter settings of the i700 servo inverter as parameter
file (*.gdc). In the »PLC Designer«, this file can then be imported in the corresponding axis.
Saving changed parameters safe against mains failure
( 53)
• The controller inhibit automatically set by the procedure can be deactivated via the
Controlword (0x6040
or 0x6840 for axis B) (setting = 7, 15).
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 controller inhibit without a change in settings.
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