Siemens Sinumerik 840DiE sl - Travel to Fixed Stop with High-Resolution Torque Reduction

01/2007
18.3 Travel to fixed stop with high–resolution torque reduction
18-515
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
18.3 Travel to fixed stop with high–resolution torque reduction
The full description of functions for ”Travel to fixed stop” can be found in:
References: /FB1/ Description of Functions, Basic Functions
Section: F1 Travel to fixed stop
18.3.1 Description of the function
As part of the NCK function ”Travel to fixed stop”, you specify the reduction of
the drive torque effective in the drive (terminal torque) via the part program in-
struction FXST. The torque reduction value specified via FXST is transferred
cyclically to the drive in the PROFIBUS message frame as ”MomRed” process
data.
The effective drive torque M
set
is calculated from:
M
set
= M
max
* MAXIMUM( 0; 1 – )
Drive parameters[%]
100
MomRed
16384
*
M
max
: Maximum possible drive torque from rated motor torque and
parameter P1230 Torque limit value.
MomRed: Control word in cyclic PROFIBUS message frame;
16384
D
= 4000
H
1, i.e., if MomRed = 16384 the
drive torque will be reduced by the value of the drive parameter
Drive torque M
set
M
max
MomRed
16384
D
4000
H
65535
D
FFFF
H
AP
Min
AP
Max
0
Fig. 18-6 Drive torque for the evaluation (drive parameter AP) and torque reduction
(MomRed) (Not true to scale)
The evaluation of the torque reduction must be identical in the drive and in the
NCK. The settings range for torque reduction is defined by the limit values
(0.005% to 10%) for the NCK machine data:
S MD37620: $MA_PROFIBUS_TORQUE_RED_RESOL
18 840Di–s
p
ecific Data and Functions