July 2013 6.14 Commissioning 1043
Unlike in operation with following error, you can also enter the optimum k
v
factor for interpolated axes. You can save a number of different k
v
factors in
the iTNC and activate them with M functions (see “The control loop" on page
810). MP1090.x applies to all axes. The worst axis determines the input value.
Procedure:
Load the axis-specific values in MP1241.x and MP1242.x (or MP1097.x and
MP1098.x if using MPMODE=340422 in OEM.SYS).
Reduce the adjusted jerk (MP1090.0) depending on the mechanical design
of the machine. Do not set the jerk lower than necessary, however, because
this strongly reduces the dynamic performance.
• If at optimized jerk the maximum acceleration is not reached during the
acceleration phase, enter the maximum machining feed rate in MP1092.
In this case, define a higher jerk for high feed rates (> MP1092) to increase
acceleration at these feed rates.
To select the nominal position value filter:
Run a test program of short line segments.
Use the oscilloscope to record the following error for each axis.
Determine for each axis the oscillations on the following error. If you cannot
find any oscillations, increase the jerk for the test in order to excite
oscillation in the axes. Remember after the test to reset the jerk for each
axis to its original value.
Select the type of suitable filter characteristic according to the description of
the nominal position value on page 821. Consider the lowest determined
frequency and the desired damping at this frequency.
With MP1200 and MP1201 (previously MP1094 and MP1095) you select
the single, double, HSC or advanced HSC filter.
Test the three filter settings using a test part made of short line segments.
• Single filter
• Double filter
• HSC filters
• Advanced HSC filters
If you have selected the best nominal position value filter for your
application, please note that your input value from MP1096.0 can be
overwritten by the machine user through Cycle 32.
If you have switched off the nominal position value filters (MP1096.x = 0),
the machine user can also switch them on using Cycle 32.
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