Siemens MICROMASTER 440 Operating Instructions Manual page 117

Issue 10/06
Supplementary torque setpoint
In the vector mode – with / without encoder – the speed controller can be
subordinate to a constant or variable supplementary torque.
The supplementary setpoint can be used to advantage for hoisting gear with low
intrinsic friction when starting in the vertical direction. The supplementary torque
setpoint must always be impressed in the hoisting (raising) direction (please
observe the sign!). As a result of the supplementary torque, also when lowering,
a slip is immediately established that has a stabilizing effect on the closed-loop
control (there is no significant load sag).
The sign of the supplementary torque setpoint can be determined as follows in
the commissioning phase with the appropriate care and taking into account all
of the relevant safety regulations:
Hoist (raise) a minimum load using the hoisting gear and read-out the sign from
parameter r0079 (the sign of r0079 corresponds to the sign of the
supplementary torque setpoint).
An empirical value of approx. 40 % of the rated motor torque r0333 has lead to
good results for existing hoisting gear
(carefully observe the sign!).
P1511=... CI: Supplementary torque setpoint
Selects the source of the supplementary torque
setpoint.
r1170
Freq. setpoint
r0063
Act. frequency
CI: Add. trq. setp
P1511.C
*) only active, if pre-control is enabled
(P1496 > 0)
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
Pre-
control
–
*)
–
T
i
(0:0)
0:0
Frequent settings:
2889
2890
755.0
755.1
2015. 2 USS (BOP link)
2018. 2 USS (COM link)
2050. 2 CB (e.g. PROFIBUS)
Droop
K
T
p
n
r1538
PI
Speed
controller
r1539
T
SLVC: P1452
VC: P1442
3 Functions
Fixed setpoint 1 as a %
Fixed setpoint 2 as a %
Analog input 1
Analog input 2
r1518
r1538
Torque
setpoint
r1539
r1508 r0079
r1515
K T
i p n
P1470 P1472
P1460 P1462
117