Siemens Sinamics G120 Series Parameter Manual page 191

Caution: Motor identification should be performed on a cold motor.
However, the identification of the motor data should only be performed if the motor temperature is within 5°C of the
measured ambient temperature stored in P0625.
If the motor identification is not within the 5°C limit then the correct functioning of Vector Control (VC, SLVC) cannot
be guaranteed.
The motor rating plate information with respect to the connection of the motor windings (Star or delta connection)
must be correct in order to establish the correct equivalent circuit data.
The motor identification calculates this data based on a Phase of a Star equivalent circuit P0350 - P0360, irrespec-
tive of whether the motor is connected star or delta.
This must be considered when the motor data is inputed directly.
Notice: P1910 can't be changed while the motoridentification with P1900 is active (P1900 = 2 or 3).
When the identification is finished P1910 is set to 0.
When choosing the setting for measurement, observe the following:
1. "with parameter change"
means that the values are actually adopted as Pxxxx parameter settings (see common settings above) and ap-
plied to the controller as well as being shown in the read-only parameters below.
2. "without parameter change"
means that the values are only displayed, i.e. shown for checking purposes in the read-only parameters r1912
(identified stator resistance), r1913 (identified rotor time constant), r1914 (ident. total leakage reactance),
r1915/r1916/r1917/r1918/r1919 (identified nominal stator reactance/identified stator reactance 1 to 4), r1925 (IG-
BT on-state voltage) and r1926 (identified gating unit dead time). The values are not applied to the controller.
Note: Before selecting motor data identification, "Quick commissioning" has to be performed in advance.
Since the cable length of the applications differ in a wide range the preset resistor P0352 is only a rough estimation.
Better results of the motor identification can be achieved by specifing the cable resistor before the start of the motor
identification by measuring/calculating.
Once enabled (P1910 > 0), A0541 generates a warning that the next ON command will initiate measurement of
motor parameters.
Communications - both via USS as well as via the Fieldbus - are interrupted for the time that it takes to make inter-
nal calculations.
This can result in the following error messages at the connected SIMATIC S7 control (communications via fieldbus):
• Parameter fault 30
• Drive fault 70
• Drive fault 75
When using STARTER (USS) to commission the drive system, data cannot be entered while these calculations are
being made.
The faults can be acknowledged as soon as the calculations have been completed in the frequency inverter. These
calculations can take up to one minute to complete.
p1911 No. of phase to be identified / No.of phase for id
Access level: 2
Quick comm. NO
Can be changed: T
Min
1
Description: Selects maximum number of motor phases to be identified.
Note: Because of averaging (measurement inprecisseness and variations in the phase) a measurement with 3 phases
delivers better results than a one phase measurement, but needs significant longer measurement time.
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
P-Group: Motor identification
Active: YES
Max
3
Parameters
List of Parameters
Data type: Unsigned16
Data set: -
Factory setting
1
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