Standstill Measurement - Siemens SINAMICS S150 Operating Instructions Manual

9.3.1.1

Standstill measurement

Description
Motor identification with p1910 is used for determining the motor parameters at standstill
(see also p1960: speed controller optimization):
● Equivalent circuit diagram data p1910 = 1
● Magnetization characteristic p1910 = 3
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 with the V/f characteristic is very important.
Motor 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 = 1 on the basis of the data on the type plate (rated data):
● Equivalent circuit diagram data
● Total resistance of:
● IGBT on-state voltage/compensation for the IGBT lockout time
Since the type plate data provides 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 encoderless vector control.
Figure 9-1
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
– Power cable resistance (R
– Stator resistance (R
Equivalent circuit diagram for induction motor and cable
Functions, monitoring, and protective functions
) and
cable
)
S
9.3 Drive functions
309