Siemens SINAMICS DCM Operating Instructions Manual page 279

Remark:
In order to determine the magnetization characteristic, during this optimization run the field-
current setpoint is reduced to a minimum value of 8% (starting from 100% of the motor's
rated excitation current as specified in p50102). Setting p50103 to values < 50 % of p50102
for the duration of this optimization run limits the value entered for the field-current setpoint
to the minimum value specified in p50103. This may be necessary for uncompensated
motors with an extremely high armature reaction.
The magnetization characteristic approaches 0 along a linear path (starting from the
measuring point), with the minimum field-current setpoint.
To execute this optimization run, the minimum excitation current for the motor (p50103) must
be set to a lower value than 50% of the motor's rated excitation current (p50102).
During this optimization run, the drive accelerates to approx. 80% of the rated motor speed.
The maximum armature voltage is 80% of the rated armature voltage of the motor
(p50101).
p50051 = 28
During this optimization run, the drive accelerates up to its maximum speed.
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
WARNING
Plotting the friction characteristic
(Duration, approx. 1 min)
The following parameters are set automatically:
p50520 to
p50530
Remark 1:
The friction characteristic is only active in operation if it is manually
activated with p50223=1!
Remark 2:
In order to execute this optimization run, the speed controller must not be
parameterized as a pure P controller or as a controller with droop.
WARNING
Friction characteristic
Commissioning
8.7 Drive optimization
277