July 2013 7.7 Special functions 1093
7.7.2 Filter order for separate low-pass filter in the speed controller
Application If a low-pass filter is used with the CC 61xx, the filter order of the low-pass
filter can be set in MP2560.x. However, MP2560.x = 0 should be entered
under standard conditions.
Spindle: High-frequency spindles often cause considerable current noise
(shown by I nom or Utilization on the oscilloscope). The optimization goal is
as little current noise as possible at high spindle speeds. MP2560.x = 10 to 20
should be used as a starting value.
Axes: The low-pass filter should be used if the actual speed has "a lot of noise,"
for example MP2560.x = 1 or 2. If there is no improvement, set MP2560.x = 0.
For adjustment of the filters, see "Adjustment of the speed controller" on page
1133.
Machine parameter MP2560.x Filter order of the low-pass filter
Input: 0 to 20
Recommended input value: 0
Recommended input value if much current noise from high-
frequency spindles: 10 to 20
7.7.3 Dynamic determination of load
General
information
During traverse motions, each machine axis behaves differently depending on
the various loads, such as the differing inertias of the workpieces.
In connection with the CC 61xx controller unit, the iTNC offers you the
possibility of optimizing the machine according to load classes. Before the
machining process, the optimum settings for a workpiece with a certain load
class can be entered.
Determining
the load
The effects of the inertia of the workpieces can be detected with a measuring
cycle created by the OEM. A measurement that determines the maximum
occurring torque (target value in % of the rated torque without decimal places)
between two points in time is started. At the same time, the machine is
optimized for this load class, and the machine parameters determined are
saved in a machine-parameter subfile.
The load class is determined for each workpiece before machining starts (via
manual entries or by determining the load with an NC macro), and the
corresponding, optimized machine-parameter subfile is selected.
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