Siemens SINAMICS S120 Installation And Start-Up Manual page 98

Communication via PROFIBUS
Cyclic communication
TRQRED (torque reduction)
This setpoint can be used to reduce the torque limit currently active on the drive.
When you use manufacturer-specific PROFIBUS telegrams with the TRQRED
control word, the signal flow is automatically interconnected up to the point where
the torque limit is scaled.
1
2
3
4
TRQDER
6
...
profibus_momred.vsd
Fig. 4-9
TRQRED specifies the percentage by which the torque limit is to be reduced. This
value is converted internally to the amount by which the torque is to be reduced
and normalized via p1544.
4-98
T_limit_1
p1520
p1542
(2050[4])
10 %
p2050[4]
T_limit_2
e.g.
p1521
by 10 %
p1542
(2050[4])
10 %
TRQRED setpoint
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
p1522
p1520
p1544
––> 100 % == 4000 hex
1 – (p1544 * x) p1543
p1523
p1521
p1544
––> 100 % == 4000 hex
1 – (p1544 * x) p1543
E Siemens AG, 2004. All rights reserved
Scaling
(1520)
p1528
(1543)
to 90 %
Scaling
(1521)
p1529
(1543)
to 90 %