Table of Contents
Advertisement
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.
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 9-1
If an output filter (see p0230) or series inductance (p0353) is used, its data 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
Large spread of the rated motor impedance
Leakage values in excess of 35 to 40% of the rated motor impedance will restrict the
dynamic response of speed and current control in the voltage limit range and in field-
weakening operation.
Note
Perform standstill measurement with the motor in a cold state
Standstill measurement must be carried out when the motor is cold. In p0625, enter the
estimated ambient temperature of the motor during the measurement (for a KTY sensor: set
p0600, p0601 and read r0035). This is the reference point for the thermal motor model and
thermal R
In addition to the equivalent circuit diagram data, motor data identification (p1910 = 3) can
be used for induction motors to determine the magnetization characteristic of the motor. Due
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Equivalent circuit diagram for induction motor and cable
/R
adaptation.
S
R
Functions, monitoring and protective functions
9.3 Drive functions
507
Advertisement
Table of Contents
