Siemens 6RA7086-6KS22 Operating Instructions Manual page 172

Start-Up
P051 = 26
If field weakening is selected (P081 = 1), if closed-loop torque control (P170=1) or torque limiting
(P169=1) is selected or if a variable field current setpoint is applied:
P051 = 27
7-14
WARNING
The set current limits are not effective during the current controller
optimization run. 75% of the rated motor armature current flows for
approximately 0.7s. Furthermore, individual current spikes of
approximately 120% of the motor rated armature current are
generated.
Speed controller optimization run (process lasts approximately 6s)
The degree of dynamic response of the speed control loop can be selected with
P236, where lower values produce a softer control loop. P236 must be set before
the speed controller is optimized, and affects the settings of P225, P226, and
P228.
For the purpose of speed controller optimization, the ultimate mechanical load
should be connected to the motor where possible, since the parameter settings
are determined by the measured moment of inertia.
The following parameters are set automatically: P225, P226 and P228.
Note:
The speed controller optimization run takes only the filtering of the actual speed
controller value parameterized in P200 into account and, if P083=1, filtering of
the main actual value parameterized in P745.
When P200 < 20ms, P225 (gain) is limited to a value of 30.00.
The speed controller optimization run sets P228 (speed setpoint filter) to the
same value as P226 (speed controller integration time) (for the purpose of
achieving an optimum control response to abrupt setpoint changes).
NOTICE
In the case of separately excited motors with a very high field circuit time
constant, a motor field current approximately equal to the rated field current of the
motor according to P102 should be flowing before this optimization run starts.
The value 3 (13, 23) must therefore be set at P082 instead of 1 (11, 21), 2 (12,
22) or 4 (14, 24) for the duration of this optimization run.
WARNING
During the speed controller optimization run, the motor is accelerated
at a maximum of 45% of its rated armature current. The motor may
reach speeds of up to approximately 20% of maximum speed.
Optimization run for field weakening (process lasts approx. 1min)
This optimization run may also be started without a mechanical load.
The following parameters are set automatically: P117 to P139, P275 and P276.
Note:
In order to determine the magnetization characteristic, the field current setpoint is
reduced during the optimization run from 100% of the motor rated field current as
set in P102 down to a minimum of 8%. The field current setpoint is limited to a
minimum according to P103 by parameterizing P103 to values < 50% of P102 for
the duration of the run. This might be necessary in the case of uncompensated
motors with a very high armature reaction.
The magnetizing characteristic is approximated linearly to 0, starting from the
measuring point, at a minimum field current setpoint.
To execute this optimization run, the minimum field current (P103) must be
parameterized to less than 50% of the rated motor field current (P102).
SIEMENS AG
SIMOREG DC Master Operating Instructions
05.05
6RX1700-0AD76