Efficient Networks Siemens Sinamics S120 - Manual (Page 140)

Vector control
4.12 Motor data identification and rotating measurement
Drive Functions
140
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
For control engineering reasons, you are strongly advised to carry out motor identification
because the equivalent circuit diagram data, motor cable resistance, IGBT on-state voltage,
and compensation for the IGBT lockout time can only be estimated if the data on the type
plate is used. For this reason, the stator resistance for the stability of sensorless vector
control or for the voltage boost in the V/f curve is very important. Motor data identification is
essential if long supply cables or third-party motors are used. When motor data identification
is started for the first time, the following data is determined with p1910 on the basis of the
data on the type plate (rated data):
Table 4-1 Data determined using p1910
Induction motor Permanent-magnet synchronous motor
p1910 = 1 • Stator resistance (p0350)
• Rotor resistance (p0354)
• Stator leakage inductance (p0356)
• Rotor leakage inductance (p0358)
• Magnetizing inductance (p0360)
• Drive converter valve threshold voltage (p1825)
• Drive converter valve interlocking times (p1828
... p1830)
• Stator resistance (p0350)
• Stator resistance q axis (p0356)
• Stator inductance d axis (p0357)
• Drive converter valve threshold voltage
(p1825)
• Converter valve interlocking times (p1828 ...
p1830)
p1910 = 3 • Saturation characteristics (p0362 ... p0366) Not recommended
Notice: When encoder adjustment is complete,
the motor is automatically rotated approx. one
revolution in order to determine the zero marker
of the encoder.
Since the type plate data contains the initialization values for identification, you must ensure
that it is entered correctly and consistently (taking into account the connection type
(star/delta)) so that the above data can be determined.
If the resistance of the motor supply cable is known, you are advised to enter this value
before the standstill measurement (p0352) so that it can be subtracted from the total
measured resistance when the stator resistance (p0350) is calculated.
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 sensorless vector control.