12 Functional Descriptions 10.94
12.18.13 Start-up
• If the drives involved have varying dynamic response characteristics (and if it is not
meaningful to match them by setting the same response values), then you can use a
setpoint filter for the purpose of matching. You can activate the setpoint filter for axes with
NC MD 1820*, bit 0; you must enter the setpoint filter time constant in NC MD 1272* or
486*.
Note:
Please note "Parameter set switchover" function description with SW 4 and higher.
• If the individual drives deviate too much in terms of dynamic response (e.g. following axis
and leading spindle) and if a setpoint filter does not produce satisfactory results, then you
must select the actual value link as the link structure.
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The dynamic response of axes which interpolate with leading and
following axes must likewise be matched to the other axes involved.
Instructions for setting with feedforward control
• Set individual axes with servo gain factor, feedforward control factor and symmetrizing time
constant such as to obtain a good response to disturbances and setpoint changes.
• Calculate substitute time constants of the individual axes according to the formula:
1–V
T
SUBS
= ––––– + T
SYM
K
v
V: Feedforward control factor
T
SYM
: Symmetrizing time constant
• Make fine adjustment by changing the setpoint filter time constant when all axes/spindles
are traversing at constant speed until the following error on all axes/spindles is the same.
• Set the axial setpoint filter (NC MD 1272* or 486*) by entering the difference between the
time constants of this axis/spindle and the slowest axis/spindle in the grouping.
Kvx= value (NC MD 252*, 1320* or 435*ff) * 100
Vx= value (NC MD 312*,1260* or 465*) * 1000
T
SYM
1
= value (NC MD 392*, 1324* or 467*) * 10
12–160
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)
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