Siemens SINAMICS S120 Function Manual page 207

It is advisable to enter the motor supply cable resistance (p0352) before the standstill
measurement (p1910) is performed, so that it can be subtracted from the total measured
resistance when the stator resistance is calculated (p0350).
Entering the cable resistance improves the accuracy of thermal resistance adaptation,
particularly when long supply cables are used. This governs behavior at low speeds,
particularly during encoderless vector control.
Figure 4-19 Equivalent circuit diagram for induction motor and cable
If an output filter (see p0230) or series inductance (p0353) is used, the data for this must
also be entered before the standstill measurement is carried out.
The inductance value is then subtracted from the total measured value of the leakage. With
sine-wave filters, only the stator resistance, valve threshold voltage, and valve interlocking
time are measured.
Note
With diffusion of more than 35% to 40% of the motor nominal impedance, the dynamic
response of the speed and current control is restricted to the area of the voltage limit and to
field weakening mode.
Note
The standstill measurement must be carried out when the motor is cold. In p0625, enter the
estimated ambient temperature of the motor during the measurement (with KTY sensor: Set
p0600, p0601 and read r0035). This is the reference point for the thermal motor model and
thermal R
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
/R adaptation.
S R
4.14 Motor data identification and rotating measurement
Vector control
205