Commissioning (software)
5.7 Commissioning modes
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
5-27
/
˰6
/
˰5
/
0
5
5
&
FDEOH
5
FDEOH
5
V
2QVWDWHYROWDJH
>9@
3
*DWLQJGHDGWLPH
>XV@
3
0DLQLQGXFWDQFH
3'
6WDWRUUHV
>˖@
3'
6WDWRUOHDNLQGXFW
3'
5RWRUOHDNLQGXFW
3'
5RWRUUHVLVWDQFH
>˖@
3'
&DEOHUHVLVWDQFH
>˖@
3'
,QYHUWHU &DEOH 0RWRU
Figure 5-7 Equivalent circuit diagram (ECD)
In addition to the ECD data, the motor magnetizing characteristic (see the figure above) can
be determined using the motor data identification (P1910 = 3). If the motor combination is
operated in the field-weakening range (which is above the nominal frequency of the motor),
then this characteristic should be determined, especially when Vector control is being used.
As a result of this magnetizing characteristic, the Inverter can, in the field-weakening range,
accurately calculate the current which is generated in the field and in-turn achieve a higher
torque accuracy.
3 3 3 3
L
w
>@
3
3
3
3
˓>@
U
>$@L
>@L
w
w
Figure 5-8 Magnetizing characteristic
After selecting the motor data identification using parameter P1910, alarm A0541 is
immediately generated. The motor identification routine is started by the ON command and
different excitation signals are impressed in the motor (DC and AC voltages). This
measurement is carried-out with the motor at a standstill and it takes, including the data
calculation per selection (P1910 = 1 or 3), between 20 seconds and 4 minutes to complete.
The identification time depends on the motor and increases with its size (this takes approx.
4 min. for a 200 kW motor).
The motor data identification routine must be carried-out with the motor in the cold condition
so that the motor resistance values saved can be assigned to the parameter of the ambient
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