HEIDENHAIN TNC 426 PB/M Technical Manual page 817

Table of Contents

December 2001

factor too large

Unlike in operation with following error, you can also enter the optimum k

factor for interpolated axes. You can save a number of different k

the TNC and activate them with M functions (See "The Control Loop" on

page 6 – 109). MP1090.x applies to all axes. The worst axis determines the

input value.

Take the axis specific values in MP1097.x and MP1098.x.

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 from the following tables the input values for MP1099.x or MP1094.

Consider the lowest determined frequency and the desired damping at this

With MP1095 you select the single or double filter. With MP1094 the HSC

filter is switched on, and the single and double filters are switched off.

Commissioning