Siemens SINAMICS S120 Function Manual page 252

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Vector control

5.13 Motor data identification and rotating measurement

Separately excited induction motors

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.

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.

The standstill measurement must be carried out when the motor is cold. In p0625, enter the

estimated motor ambient temperature during the measurement (for PT1000 or KTY sensor:

Set p0600, p0601 and read r0035). This is the reference point for the thermal motor model

and thermal R

The rated magnetization current and the magnetization characteristic should, if possible, be

determined during the rotating measurement (p1900 = 3) (without encoder: p1960 = 1; with

encoder: p1960 = 2). The magnetization characteristic can be used to calculate the field-

generating current in the field-weakening range more accurately, thereby increasing torque

In comparison with standstill measurement (p1910) for induction motors, rotating

measurement (p1960) allows the rated magnetizing current and saturation characteristic to

be determined much more accurately.

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

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