Calculating The Motor And Controller Data; Motor Data Identification - Siemens Simatic ET 200pro FC Operating Instructions Manual

7.2.2

Calculating the motor and controller data

The internal motor and controller data are calculated using the parameter P0340, or
indirectly with the help of the parameter P3900 or P1910. The function of the parameter
P0340 can be used, for example, if the data of the replacement circuit or the values of the
moments of inertia are known.
Table 7- 4
P0340
0
1
2
3
4
For complete parameterization (P0340=1), not only the motor and controller parameters are
assigned in advance but also the parameters which are related to the rated motor data
(e.g. torque limit values and reference quantities for interface signals). The List Manual
contains a full list of all parameters depending on P0340. For calculation of the motor and
controller data with P0340 there are various scenarios which can be called up as a function
of the known data.
7.2.3

Motor Data Identification

Description
The Inverter has a measuring technique which is used to determine the motor parameters:
Equivalent circuit diagram (ECD)
Measures Equivalent circuit diagram (ECD)
+ Magnetizing characteristic (includes
P1900 = 2)
For control-related reasons, it is essential that the motor data identification is performed.
Without performing the motor data identification it is only possible to estimate ECD data
using information from the motor rating plate. For example, the stator resistance is extremely
important for the stability of the closed-loop Vector control and for the voltage boost of the V/f
characteristic. The motor data identification routine should be executed, especially if long
feeder cables or if third-party motors are being used.
If the motor data identification routine is being started for the first time, then the following
data is determined, starting from the rating plate data (rated [nominal] data) with P1900 = 2:
● ECD data
● Motor cable resistance
● IGBT on-state voltage and compensation of IGBT gating dead times.
ET 200pro FC
Operating Instructions, 07/2016, A5E01100763B AC
7.2 Commissioning and optimization of the frequency converter and motor combination
Settings for P0340
Meaning
No calculation
Complete parameterization
Calculation of the replacement circuit data
Calculation of V/f and the closed-loop vector control
Calculation of the controller settings
Commissioning and optimization (software)
➙ P1900 = 2
➙ P1900 = 3
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