Commissioning
8.8 Drive optimization
SINAMICS DCM DC Converter
340 Operating Instructions, 12/2018, A5E34763375A
Optimization of the speed control
The dynamic performance of the speed control loop can be selected using
p50236, whereby lower values represent a softer closed
-loop control.
Before carrying out the speed controller optimization run, p50236 must be
set and influences the setting of p50225,
p50226, p50228 and p50540.
Where possible, the final mechanical load should be connected to the motor
for the purpose of optimizing the speed controller, as the parameters set
depend on the measured moment of inertia.
The following parameters are automati
cally set:
p50225, P gain of speed controller (Kp)
p50226, integral time of speed controller (Tn)
p50228, speed setpoint smoothing time constant
p50540, speed controller acceleration time
The speed controller optimization run only takes into accoun
t the filtering,
set using p50200, of the actual speed controller value and
– if p50083 = 1 –
the filtering, set using p50745, of the main actual value.
p50225 (gain) is limited to a value of 30.00. The speed controller
optimiz
ation run always sets p50228
(speed setpoint filtering) to 0. If a Kp of
30.0 was determined by the optimization run, manual re
-optimization is
recommended (see Chapter "Optimizing the speed controller (Page 347)").
Unexpected movement of the motor during optimization run
During the speed controller optimization run, the motor is accelerated at a maximum of 45%
of its rated armature current. The motor can reach speeds of up to approximately 20% of
the maximum speed.
The movements of the drive can result in death, severe injury or material damage.
• Observe the general safety instructions.
Optimization of the EMF control (incl. field characteristic recording)
(duration, approx. 1 min)
This optimization run must be executed if field
-weakening operation has
0081 = 1), if closed-loop torque control (p50170 = 1) or
torque limiting (p50169 = 1) has been selected, or if a variable field current
setpoint has been entered.
This optimization run may also be started without a mechanical load. The
following parameters are set automatically:
Field characteristic (magnetization characteristic) of motor
P gain of EMF controller (Kp)
Integral time of EMF controller (Tn)
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