Positioning Window - HEIDENHAIN iTNC 530 Service Manual

3.3.5 Positioning window

The positioning window defines the limits within which the control considers a position to have
been reached. After the position has been reached, the control begins running the next block.
The position controller can correct a disturbance inside this window without activating the
"Return to the Contour" function.
MP1030.x
Input:
The NC program gets caught up in an NC block.
Possible
error
The list does not claim to be complete; ask your machine tool builder!
Possible
You may add your own experiences!
causes of error
Slightly increase the value for the positioning window and observe the machine behavior.
Test for
Restore the original value afterwards.
troubleshooting
Once the axes have moved into the positioning window, the corresponding bits are set in
Axes in position
W1026. This also applies to the status after the machine control voltage is switched on. Axes
that are not used are considered to be in position.
The NC resets the bits as soon as you start a positioning movement or traverse the reference
marks.
In the Electronic Handwheel mode of operation the bit for the current handwheel axis is reset.
W1026 is not set for contours that can be machined with constant surface speed.
W1026
3 – 670
The size of the positioning window is defined in MP1030.x.
Positioning window
0.0001 to 2.0000 [mm]
Excessive static and sliding friction ("slip & stick")
Chip in the thread during tapping, thread milling or forming (The spindle "vibrates" to the left
and right without leaving the hole.)
Analog axes: Excessive drift
Digital axes: Insufficient controller adjustment (The axis "oscillates" and "jitters" around the
positioning window.)
Missing acknowledgment of M, S, T, G, Q strobe signals (strobe acknowledgments, PLC)
Defective motor coil: No exact positioning can be performed at this place.
Axes in position
Bits 0 to 8 represent axes 1 to 9
0: Axis not in positioning window
1: Axis in positioning window
Set Reset
NC NC
HEIDENHAIN Service Manual iTNC 530