Siemens SINAMICS DCM Operating Instructions Manual page 280

Commissioning
8.7 Drive optimization
p50051 = 29
This optimization run must not be executed if the motor is connected to a mechanical load
that is able to move the motor while it is in a torque-free state (e.g. a suspended load).
NOTICE
For drives with limited travel distance, the optimization run for field weakening (p50051 =
27) should be interrupted by entering the SHUTDOWN command at the earliest after the
1st field-weakening measuring point has been plotted or the friction characteristic has been
plotted (p50051 = 28) and at the earliest after determining the measuring point at 10% of
the maximum speed - without fault message F60052 being initiated. Once the optimization
run in question (p50051 = 27 or p50051 = 28) has been restarted, it will resume at a more
advanced point, meaning that it can be completed in several stages even in cases where
the travel distance is limited.
In the following cases, each optimization run is completely executed again after a restart:
 If a fault occurs during the optimization run
 If the electronics supply is switched off prior to restarting the optimization run in question
 If a different drive data set from the previous one is selected
 If a different optimization run is started in the meantime
The parameters for the drive data set that has been selected in each case are optimized.
The drive data set selection must remain the same throughout the optimization runs to
avoid a fault being output.
278
Optimization of closed-loop speed control for drives with a mechanical
system capable of oscillation
(duration up to 10 min)
The following parameters are set automatically:
p50225
p50226
p50228
p50540
The frequency response of the controlled system for frequencies between 1
and 100 Hz is recorded during this optimization run.
For this purpose, the drive is first accelerated to a basic speed (p50565,
factory setting = 20%). A sinusoidal speed setpoint with a low amplitude
(p50566, factory setting = 1%) is then switched in. The frequency of this
additional setpoint is changed in 1 Hz increments from 1 to 100 Hz. For
each frequency, an average is generated over a specific time (p50567,
factory setting = 1 s).
The value set at p50567 essentially defines the duration of this optimization
run. For a setting of 1 s it takes about 3 to 4 min.
The measured frequency response of the controlled system forms the basis
for determining its optimal speed controller setting.
WARNING
P gain of the speed controller (Kp)
Integral time of the speed controller (Tn)
Speed setpoint, smoothing time constant
Speed controller acceleration time
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter