Siemens SINAMICS DCM Operating Instructions Manual page 311

p50051 = 29
Uncontrolled motor movement
For motors with a suspended or drawing load, uncontrolled movement can occur during the
optimization run which can lead to death, serious injury or property damage.
• The optimization run must not be executed if the motor is connected to a mechanical
Notes regarding optimization runs
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.
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A
Optimization of the 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
load that is able to move it while it is in a torque-free state (e.g. a suspended or drawing
load).
P gain of the speed controller (Kp)
Integral time of the speed controller (Tn)
Speed setpoint, smoothing time constant
Speed controller acceleration time
Commissioning
8.8 Drive optimization
309