Siemens Simovert Masterdrives Compendium page 260

09.2008
7.3 Converter functions
7.3.1 Friction characteristic function (function diagram 399)
7.3.1.1 Friction characteristic
7.3.1.2 Friction characteristic recording (automatic procedure)
Start of measuring
NOTE
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES
The friction characteristic is made up of 10 intermediate points each
with a speed value (x axis) and a torque value (y axis). The pair of
values (U215, U216) defining the intermediate point is to be given in %
of the reference speed and in % of the reference torque.
The characteristic refers to the absolute value of the input variable
(U214, e. g. KK0091 actual speed value). The derived torque (K0615)
is output as a positive or negative value according to the current sign of
the input. Weighting of the friction characteristic can be performed with
the aid of parameter U217. BICO parameter U218 serves for selecting
the source from which the friction characteristic is switched in (switched
out => K0615 = 0).
BICO parameter U219 is used to select the source for starting
automatic recording of the friction characteristic. When the status of this
source changes from 0 to 1 friction characteristic recording is started,
feedforward control of the friction characteristic is prevented internally
(K0615 = 0).
In the first step, the necessary enables and assignments are checked:
Prescribed assignments:
♦ Master drive (P587 = 0)
♦ P260 = 153 or P262 = 153;
♦ P228 = 152;
Necessary enables:
♦ Enable pulse
♦ Enable speed control
♦ Enable direction of rotation (positive and/or negative)
♦ Positive and negative speed limits (P452, P453) chosen so that,
with due regard to the direction of rotation enabled, the
characteristic takes full effect in the pertinent direction of rotation.
If incorrect assignments are made or an enable is absent, fault F099
occurs.
If the assignments and enables are correct, the converter displays
alarm A72 and waits for the ON command in order to begin with rotary
measuring. If the ON command is not given within 30s, friction
characteristic recording is interrupted with fault F099.
Measuring can be started only from converter status °008 and °009.
Compendium Motion Control
Functions
7-51