Efficient Networks Siemens Sinamics S120 - Manual (Page 102)

Servo control
3.14 Vdc control
Drive Functions
102
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Angular commutation offset commissioning support (p1990)
The function for determining the commutation angle offset is activated via p1990=1. The
commutation angle offset is entered in p0431. This function can be used in the following
cases:
● Single calibration of the pole position for encoders with absolute information
(exception: The Hall sensor must always be mechanically adjusted.)
● Calibrating the zero mark position for fine synchronization
Table 3-15 Mode of operation of p0431
Incremental without
zero mark
Incremental with one
zero mark
Incremental with distance-
coded zero marks
EnDat absolute
encoder
C/D track p0431
shifts the commutation
with respect to the C/D
track
p0431
shifts the commutation
with respect to the C/D
track and zero mark
Currently not available Not permitted
Hall sensor p0431
does not influence the
Hall sensor. The Hall
sensor must be
mechanically adjusted.
p0431
does not influence the
Hall sensor.
p0431
shifts the commutation
with respect to the zero
mark
p0431
does not influence the Hall
sensor.
p0431
shifts the commutation with
respect to the absolute
position (after two zero marks
have been passed)
Not permitted
Pole position
identification
p0431
no effect
p0431
shifts the commutation
with respect to the zero
mark
p0431
shifts the commutation with
respect to the absolute
position (after two zero marks
have been passed)
p0431
shifts the commutation
with respect to the
EnDat absolute
position
Note
When fault F07414 occurs, p1990 is automatically started; if p1980 is not equal to 99 and
p0301 does not refer to a catalog motor with an encoder that is adjusted in the factory.
3.14 Vdc control
Description
Vdc control can be activated if overvoltage or undervoltage is present in the DC link line-up.
In the line-up, one or more drives can be used to relieve the DC link. This prevents a fault
from occurring due to the DC link voltage and ensures that the drives are always ready to
use
This function is activated by means of the configuration parameter (p1240). It can be
activated if an overvoltage or undervoltage is present. The torque limits of the motors at
which the Vdc controller is active can be affected if discrepancies in the DC link voltage are