Efficient Networks Siemens Sinamics S120 - Manual (Page 151)

Vector control
4.15 Instructions for commissioning permanent-magnet synchronous motors
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
151
Note
If pulse inhibition of the converter occurs (fault or OFF2), synchronous motors can
generate high terminal voltages in the field weakening range, which could lead to
overvoltage in the DC link. The following possibilities exist to protect the drive system
from being destroyed due to overvoltage:
1. Restrict (p0643 = 0) maximum speed (p1082)
2. External voltage limiter or chopper or other measures appropriate to the application.
CAUTION
With p0643 = 1, it must be ensured that there is sufficiently high and suitable
overvoltage protection. If necessary, system-side precautions should be taken.
● Depending on the terminal voltage and load cycle, the maximum torque can be taken
from the motor data sheets / project design instructions.
Commissioning
We recommend the following points when commissioning:
● Commissioning Wizard in STARTER
The motor identification routine and the "rotating measurement" (p1900) can be activated
from the commissioning Wizard in STARTER. The encoder adjustment (p1990) is
automatically activated together with the motor identification routine.
● Motor identification (standstill (static) measurement (p1910)
● Encoder adjustment (p1990)
WARNING
During initial commissioning and when the encoder is replaced, the encoder must be
adjusted (p1990).
● Rotating measurement (p1960)
The following parameters can be entered in STARTER during the commissioning phase:
The optional motor data can be entered if it is known. Otherwise, they are estimated using
the rating plate data or are determined using a motor identification routine or speed controller
optimization.