Motor Data Identification - Siemens SINAMICS G120 Operating Instructions Manual

Commissioning (software)
5.7 Commissioning modes
Speed control optimisation
Parameter Description (Parameter name and factory setting (if not variable) in bold)
P0010 = 0 Commissioning parameter filter*
Check if P0010 = 0 (Ready)
P1960 = 1 Speed control optimisation
0: Disable
1: Enable
ON Start Speed control optimisation
command We recommend the Speed control optimisation if vector mode (P1300 = 20 or 21) is selected. Once P1960 =
1, alarm A0542 is generated, that states, the next ON command will initiate the optimisation. If there is a
problem with speed control optimisation due to instability the drive may trip with fault F0042, because no
stable value has been obtained on the ramp up within a reasonable time.
Note: When Speed control optimisation is complete A0542 will be cleared and P1960 will be cleared to zero.
5.7.1

Motor data identification

Motor identification data
The Inverter has a measuring technique which is used to determine the motor parameters:
Equivalent circuit diagram (ECD)
Magnetizing characteristic (saturation
curve)
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 P1910 = 1:
● ECD data
● Motor cable resistance
● IGBT on-state voltage and compensation of IGBT gating dead times.
The rating plate data represents the initialization values for the identification. This is the
reason that it is necessary to have the correct input from the rating plate data when
determining the data specified above.
5-26
➙ P1900 = 2
➙ P1900 = 3
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S